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Tytuł:
Fatigue properties of nodular cast irons alloyed by Si, Mo and Cu
Autorzy:
Vaško, Alan
Krynke, Marek
Powiązania:
https://bibliotekanauki.pl/articles/88535.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
SiMo
SiCu
fatigue
żeliwo sferoidalne
zmęczenie
Opis:
In recent years, the research of nodular cast iron has been focused on increasing fatigue resistence. In the paper, two types of alloyed nodular cast irons have been investigated – SiMo-nodular cast iron alloyed by 4% of silicon and 1% of molybdenum and SiCu-nodular cast iron alloyed by 4% of silicon and 1.5% of copper. SiMo-nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines. SiCu-nodular cast iron is used in various components of tribotechnical units. These components are often loaded by fatigue. The mechanical and fatigue behaviour of both nodular cast iron types has been studied by means of tensile test, impact bending test, hardness test and fatigue tests. Fatigue tests were realised at low frequency cyclic push-pull loading up to 10 million cycles. The relationship between the amplitude of stress and number of cycles to failure was investigated and the fatigue strength was determined. Mechanical and fatigue properties of both nodular cast iron types are correlated with the microstructure of specimens.
Źródło:
System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 738-744
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and Dynamic Mechanical Properties of Nodular Cast Irons
Autorzy:
Vaško, A.
Belan, J.
Tillová, E.
Powiązania:
https://bibliotekanauki.pl/articles/354847.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron
microstructure
mechanical properties
fatigue
failure mode
Opis:
Effects of charge composition on microstructure, mechanical and fatigue properties of nodular cast irons have been studied. For experiments, five melts of nodular cast iron were used – three types of unalloyed nodular cast irons (with different ratio of steel and pig iron in a charge and different additives for regulation of the chemical composition) and two types of alloyed nodular cast irons (SiMo- and SiCu- nodular cast iron). The microstructure of the specimens was evaluated according to a norm and by automatic image analysis. The mechanical properties were investigated by the tensile test, impact bending test and Brinell hardness test. The fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The best mechanical properties were reached in the nodular cast iron alloyed by Si and Cu, what is related to its microstructure.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 185-190
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Chunky Graphite in Nodular Cast Iron on the Base of Numerical Simulation and Experimental Data
Autorzy:
Bauer, B.
Mihalic Pokopec, I.
Petrič, M.
Mrvar, P.
Powiązania:
https://bibliotekanauki.pl/articles/352270.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chunky graphite
nodular cast iron
numerical simulation
cooling curve
microstructure
Opis:
Chunky graphite has been recognized for a long time as one of the major problems in production of heavy section nodular cast iron. A great number of studies have been conducted to describe the chunky graphite formation, but a clear understanding of its appearance and a safe mastering of the melt preparation to avoid chunky graphite are not yet available. In the present work the cooling curves were recorded in large cone blocks and standard TA cup. According to measured data from the cone block, melt characteristics and heat transfer coefficient between casting and mould were adjusted in the ProCAST® simulation software. For a near-eutectic nodular cast iron test melt with 0.7 wt.% Ni, relationship between the area of the cone block affected by chunky graphite and simulation software results has been observed, i.e., thermal modulus and time to solidus.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 343-347
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Cooling Curves of Nodular Cast Iron
Autorzy:
Bartošová, M.
Pribulová, A.
Eperješi, Š.
Futáš, P.
Powiązania:
https://bibliotekanauki.pl/articles/106981.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
cooling curve
nodular cast iron
eutectic transformation
thermal analysis
metallurgical quality
Opis:
The solidification of cast iron is a complex process with characterized entrance and marginal conditions. Thermal analysis is one of the processes that allows us to observe the solidification of alloys. There is a possibility of gaining information about the melted cast iron quality and predicting the final properties of the cast by evaluating the scanned cooling curves by solidification (stable and metastable system). This article deals with the study and analysis of cooling curves taken from production conditions of a foundry during ductile cast iron production. The aim is to discover the reproduction and reliability of the thermal analysis results of cast iron. The study of the progress of the cooling curves and their first derivation to follow the reactions of the curves to changing factors in the production process.
Źródło:
Journal of Casting & Materials Engineering; 2018, 2, 1; 1-4
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of over-cooling the nodular cast iron to the graphite form in the surface layer
Autorzy:
Hosadyna, M.
Dobosz, S. M.
Kusiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/382407.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
żeliwo sferoidalne
moduł odlewniczy
postać grafitu
nodular cast iron
casting module
graphite form
Opis:
A cast iron is gradient material. This means that depending on the cooling rate it is possible, at the same chemical composition and the physicochemical state of molten metal, to obtain material with a different structure. The connection between the wall thickness of the casting and the speed of its cooling expresses the casting module. Along with the module escalation a cooling rate of the casting is reducing what can cause changes of the microstructure and the increased tendency to the crystallization of distorted graphite forms. Inspections of experimental castings from nodular cast iron with different modules were conducted to the graphite form.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1; 43-46
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the hardener type on the sulfur diffusion from moulding sand to the casting surface
Autorzy:
Hosadyna, M.
Dobosz, S. M.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/381690.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sand
sulphur diffusion
nodular cast iron
masa formierska
dyfuzja siarki
żeliwo sferoidalne
Opis:
The article is discussing authors examinations concerning the influence of the sulphur diffusion from moulding sand on reduction the efficiency of modifier elements in the process of making the nodular cast iron. In case of magnesium decrease of its content is observe, as a result of forming the magnesium sulphide. In consequence the participation of magnesium is falling below the concentration essential to create a spheroid graphite. The source of sulphur in no-bake sand with resin modified by furfuryl alcohol is a hardener, on the basis of sulphonic acids and sulphuric acid. Described examinations relate to no-bake sands made on the warp of fresh quartz sand.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 87-92
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading
Autorzy:
Vaško, A.
Powiązania:
https://bibliotekanauki.pl/articles/353103.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue test
low frequency cyclic loading
nodular cast iron
steel scrap
silicon carbide
Opis:
Three melts of ferrite-pearlitic nodular cast iron with different charge composition were used for fatigue tests. Wöhler fatigue curves and fatigue strength were obtained, and microstructure and fracture surfaces were investigated. The aim of the paper is to determine the influence of charge composition on microstructure, mechanical and fatigue properties of synthetic nodular cast irons and their micromechanisms of failure. Fatigue tests were realised at low frequency sinusoidal cyclic push-pull loading (stress ratio R = −1) at ambient temperature (T = 20 ±5°C). They were carried out with using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f ≈ 120 Hz. The results of fatigue tests at low frequency cyclic loading are compared with fatigue properties at high frequency cyclic loadin.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2205-2210
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Resistance and Other Utility Properties of NiMn-Type of Austenitic Nodular Cast Iron
Autorzy:
Vaško, Alan
Uhríčik, Milan
Kaňa, Václav
Powiązania:
https://bibliotekanauki.pl/articles/27707054.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Ni-Resist
austenitic nodular cast iron
EN-GJSA-XNiMn13-7
fatigue
push-pull loading
Opis:
The aim of this paper is to evaluate the fatigue resistance of austenitic nodular cast iron and to compare it with other types of nodular cast irons. The austenitic nodular cast iron, used for the experiments, was alloyed by 13% nickel and 7% manganese (EN-GJSA-XNiMn13-7) to obtain an austenitic matrix. The microstructure was studied using light metallographic microscopy. Mechanical properties were investigated by tensile test, impact bending test and Brinell hardness test. Fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The results of fatigue tests were compared with the fatigue properties of ferrite-pearlitic nodular cast iron and pearlite-ferritic nodular cast iron. Experimental results show that NiMn-type of austenitic nodular cast iron has lower tensile strength and hardness, but higher elongation and absorbed energy than the compared types of nodular cast iron. However, austenitic nodular cast iron has lower fatigue limit.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 563--569
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of structure and mechanical properties of nodular cast irons after casting and after heat treatment
Autorzy:
Vaško, A.
Belan, J.
Kuchariková, L.
Powiązania:
https://bibliotekanauki.pl/articles/114859.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
ferritizing annealing
isothermal heat treatment
żeliwo sferoidalne
wyżarzanie ferrytyczne
obróbka cieplna izotermiczna
Opis:
The paper deals with the influence of charge composition on microstructure and mechanical properties of synthetic nodular cast irons after casting and after heat treatment (ferritizing annealing and isothermal heat treatment). Chemical composition of individual melts was regulated alternatively by carburizer and ferrosilicon (FeSi) or metallurgical silicon carbide (SiC). The results of experiments show that SiC additive positively influences the microstructure as well as mechanical properties of nodular cast iron, especially in specimens from the melts with higher ratio of steel scrap in the charge.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 31-38
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Shape of Graphite Precipitates on the Cast Iron Abrasion Resistance
Autorzy:
Jakubus, A.
Soiński, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/381926.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron
vermicular cast iron
grey cast iron
abrasion resistance
żeliwo sferoidalne
żeliwo wermikularne
żeliwo szare
odporność na ścieranie
Opis:
The paper presents the initial results of investigation concerning the abrasion resistance of cast iron with nodular, vermicular, or flake graphite. The nodular and vermicular cast iron specimens were cut out of test coupons of the IIb type with the wall thickness equal to 25 mm, while the specimens made of grey cast iron containing flake graphite were cut out either of special casts with 20 mm thick walls or of the original brake disk. The abrasion tests were carried out by means of the T-01M tribological unit working in the pin-on-disk configuration. The counterface specimens (i.e. the disks) were made of the JT6500 brand name friction material. Each specimen was abraded over a distance of 4000 m. The mass losses, both of the specimens and of the counterface disks, were determined by weighting. It was found that the least wear among the examined materials was exhibited by the nodular cast iron. In turn, the smallest abrasion resistance was found in vermicular cast iron and in cast iron containing flake graphite coming from the brake disk. However, while the three types of specimens (those taken from the nodular cast iron and from grey cast iron coming either from the special casts or from the brake disk) have almost purely pearlitic matrix (P95/Fe05), the vermicular cast iron matrix was composed of pearlite and ferrite occurring in the amounts of about 50% each (P50/Fe50). Additionally, it was found that the highest temperature at the cast iron/counterface disk contact point was reached during the tests held for the nodular cast iron, while the lowest one occurred for the case of specially cast grey iron.
Źródło:
Archives of Foundry Engineering; 2019, 4; 87-90
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Final Inoculation on the Metallurgical Quality of Nodular Cast Iron
Autorzy:
Dwulat, Rafał
Janerka, K.
Grzesiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/2079809.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron
inoculation of cast iron
thermal derivative analysis
properties of cast iron
żeliwo sferoidalne
modyfikacja żeliwa
analiza termiczna
właściwości żeliwa
Opis:
The article presents the results of research on the physicochemical and mechanical properties, microstructure, and the tendency to form shrinkage of nodular cast iron depending on the type of inoculant used for secondary inoculation. Six different inoculants containing different active elements in their chemical composition were used for the research. Step castings and Y2 wedges were made on the vertical forming line using an automatic pouring machine. The inoculation in the amount of 0.2% was made using a pneumatic dispenser equipped with a vision system controlling the effectiveness of the inoculation. The results of the thermal analysis were determined and compared, and the potential of each of the inoculants was assessed.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 5-14
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion resistance of SiMo- and SiCu-types of nodular cast iron in NaCl solution
Autorzy:
Vaško, Alan
Zatkalíková, Viera
Kaňa, Václav
Powiązania:
https://bibliotekanauki.pl/articles/88510.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
corrosion
exposure immersion test
NaCl solution
żeliwo sferoidalne
korozja
roztwór NaCl
właściwości mechaniczne
właściwości zmęczeniowe
Opis:
Nodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m-2 day-1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.
Źródło:
System Safety : Human - Technical Facility - Environment; 2020, 2, 1; 191-198
2657-5450
Pojawia się w:
System Safety : Human - Technical Facility - Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the carbides and matrix on the wear resistance of nodular cast iron
Autorzy:
Gumienny, G.
Powiązania:
https://bibliotekanauki.pl/articles/380497.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloy
carbidic nodular cast iron
wear resistance
ADI
stop odporny na ścieranie
żeliwo sferoidalne
odporność na zużycie
Opis:
This paper presents the results of the abrasive wear resistance of selected types of nodular cast iron, including ADI, cooperating with quartz sand and 100 grit abrasive paper. It has been shown that carbides in nodular cast iron cause an increase in wear resistance of 6 to 12% depending on the surface fraction of the carbides and type of the matrix. For the same unit pressure the mass loss of the cast iron cooperating with quartz sand is many times larger than the cast iron cooperating with abrasive paper. For both abrasives the highest wear resistance showed nodular cast iron with upper and lower bainite and carbides.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 25-29
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Nickel Equivalent on Structure and Corrosion Resistance of Nodular Cast Iron Ni-Mn-Cu
Autorzy:
Medyński, D.
Janus, A.
Powiązania:
https://bibliotekanauki.pl/articles/381447.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenitic nodular cast iron
cast iron Ni-Mn-Cu
nickel equivalent
martensitic transformation
corrosion
żeliwo sferoidalne
żeliwo Ni-Mn-Cu
nikiel
przemiany martenzytyczne
korozja
Opis:
Within the research determined was the effect of nickel equivalent on structure, hardness and corrosion resistance of nodular cast iron Ni- Mn-Cu. The examinations revealed a drop of thermodynamic stability of austenite along with decreasing nickel content. Along with in-creasing degree of austenite transformation, the created martensite resulted in significant increase of hardness (and of abrasion resistance as well) of the examined of cast iron, accompanied by insignificant decrease of corrosion resistance.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1 spec.; 69-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Continuous Cooling Transformation (CCT) Diagrams Of Carbidic Nodular Cast Iron
Wykresy CTPc żeliwa sferoidalnego z węglikami
Autorzy:
Gumienny, G.
Giętka, T.
Powiązania:
https://bibliotekanauki.pl/articles/355132.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbidic nodular cast iron
bainite
ausferrite
continuous cooling transformation diagrams
żeliwo sferoidalne z węglikami
bainit
ausferryt
schematy transformacji chłodzenia ciągłego
Opis:
This work presents continuous cooling transformation diagrams for different kinds of carbidic nodular cast iron. We investigated the cast iron, chemical composition of which in nodular cast iron allows the obtainment of a metal matrix which consists of: pearlite, upper bainite and its mixture with lower bainite, ausferrite and martensite when the casts were cooled in the mold. The influence of the rate of cooling on the obtained microstructure and hardness of the casts was shown. The work describes the influence of the alloy additives on the curves of austenite decomposition in the carbidic nodular cast iron. Diagrams were plotted which enable an understanding of the kinetics of the transformations of austenite in carbidic nodular cast iron. The diagrams also indicate the possibility of obtaining pearlite, bainite, martensite and ausferrite with the established chemical composition and the wall thickness of the cast.
W pracy przedstawiono wykresy CTPc różnych rodzajów żeliwa sferoidalnego z węglikami. Zbadano żeliwo o składzie chemicznym zapewniającym uzyskanie w żeliwie sferoidalnym osnowy metalowej złożonej z: perlitu, bainitu górnego oraz jego mieszaniny z dolnym, ausferrytu i martenzytu przy studzeniu odlewów w formie. Pokazano wpływ szybkości studzenia na uzyskiwaną mikrostrukturę i twardość odlewów. Opisano wpływ dodatków stopowych na krzywe rozpadu austenitu w żeliwie sferoidalnym z węglikami. Opracowane wykresy umożliwią poznanie kinetyki przemian austenitu w żeliwie sferoidalnym z węglikami oraz ocenę możliwości uzyskania perlitu, bainitu, martenzytu i ausferrytu przy zadanym składzie chemicznym oraz grubości ściany odlewu.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 705-710
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Temperature on Ausferritic Nodular Cast Iron Microstructure
Autorzy:
Gumienny, G.
Klimek, L.
Powiązania:
https://bibliotekanauki.pl/articles/379556.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting materials
innovative casting technologies
nodular cast iron
ausferrite
annealing
innowacyjne materiały odlewnicze
innowacyjne technologie
żeliwo sferoidalne
wyżarzanie
Opis:
The work presents the results of the studies of the effect of the temperature on the microstructure of ausferritic nodular cast iron. The ausferrite in the matrix was obtained by way of a specific combination of molybdenum and copper. The cast iron underwent annealing at the temperatures of 520, 550 and 580°C. The work presents the effect of the annealing temperature on the fraction of austenite in the cast iron matrix. The annealed and non-annealed cast iron hardness is given. The work also proves that an increase in the temperature up to 580°C causes a drop in the cast iron hardness.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3 spec.; 21-24
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Hardening of Nodular Cast Iron by GTAW Remelting
Autorzy:
Orłowicz, A. W.
Trytek, A.
Korzeniowski, M.
Kupiec, B.
Powiązania:
https://bibliotekanauki.pl/articles/379624.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solidification process
mechanical properties
nodular cast iron
GTAW process
surface layer
proces krzepnięcia
właściwości mechaniczne
żeliwo sferoidalne
proces GTAW
warstwa powierzchniowa
Opis:
The study reported in this paper was aimed at establishing the effect of values of parameters characterizing the process of superficial remelting of a nodular iron casting on the quantity of introduced heat, geometry of remeltings as well as parameter λ and hardness of cementite eutectic. The remelting process was carried out using GTAW method, at electric arc length of 3 mm in argon atmosphere, welding current intensities I = 50, 130, 210, and 300 A, and electric arc scanning speeds vs = 200, 400, and 800 mm/min. The measurements included estimation of the quantity of heat introduced to the casting in the electric arc-induced remelting process with the use of flow calorimeter. Widths and depths of remetlings were assessed with the use of metallographic method. As a result of fast solidification, cementite eutectic was obtained in remelted material in which, in the course of cooling down to ambient temperature, austenite was subject to partial transformation into martensite. To characterize the cementite eutectic, value of the structural parameter λ was assessed. Values of the parameter were similar for areas of occurrence of both fibrous and laminated eutectic. Remeltings were examined at half of their depths. Micro-hardness measurements were taken in the same areas. The established quantitative relationships may prove to be useful in practice for the purpose of predicting values of parameter λ and hardness of remeltings in studies aimed at improving resistance of cast-iron castings to abrasive wear.
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 53-58
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microsegregation in nodular cast iron with carbides
Autorzy:
Pietrowski, S.
Gumienny, G.
Powiązania:
https://bibliotekanauki.pl/articles/380448.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
żeliwo sferoidalne
węgliki
mikrosegregacja
innovative foundry technologies
innovative foundry materials
nodular cast iron
carbides
microsegregation
Opis:
In this paper results of microsegregation in the newly developed nodular cast iron with carbides are presented. To investigate the pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The distribution of linear elements on the eutectic cell radius was examined. To investigate the microsegregation pearlitic and bainitic cast iron with carbides obtained by Inmold method were chosen. The linear distribution of elements on the eutectic cell radius was examined. Testing of the chemical composition of cast iron metal matrix components, including carbides were carried out. The change of graphitizing and anti-graphitizing element concentrations within eutectic cell was determined. It was found, that in cast iron containing Mo carbides crystallizing after austenite + graphite eutectic are Si enriched.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 127-134
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavitation Erosion of Nodular Cast Iron - Microstructural Effects
Autorzy:
Orłowicz, A. W.
Mróz, M.
Tupaj, M.
Trytek, A.
Jacek, M.
Radoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/379634.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloy
nodular cast iron
cavitation erosion
distilled water
stop odporny na ścieranie
żeliwo sferoidalne
erozja kawitacyjna
woda destylowana
Opis:
The paper deals with susceptibility of nodular cast iron with ferritic-pearlitic matrix on cavitation erosion. Cavitation tests were carried out with the use of a cavitation erosion vibratory apparatus employing a vibration exciter operated at frequency of 20 kHz. The study allowed to determine the sequence of subsequent stages in which microstructure of cast iron in superficial regions is subject to degradation. The first features to be damaged are graphite precipitates. The ferritic matrix of the alloy turned out to be definitely less resistant to cavitation erosion compared to the pearlitic matrix component.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 119-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The micro-mechanisms of failure of nodular cast iron
Autorzy:
Vasko, A.
Chalupova, M.
Powiązania:
https://bibliotekanauki.pl/articles/112051.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
ferrite-pearlitic matrix
mechanical properties
micromechanisms of failure
żeliwa sferoidalne
macierz ferrytyczno-perlityczna
właściwości mechaniczne
niewydolność mikromechanizmów
Opis:
The contribution deals with a comparison of the micro-mechanisms of failure of nodular cast irons at static, impact and fatigue stress. Several specimens of ferrite-pearlitic nodular cast irons with different content of ferrite in a matrix were used for metallographic analysis, mechanical tests and micro-fractographic analysis. Mechanical properties were found by static tensile test, impact bending test and fatigue tests. The micro-fractographic analysis was made with use of scanning electron microscope VEGA II LMU on fracture surfaces of the specimens fractured by these mechanical and fatigue tests. Fracture surfaces of analysed specimens are characteristic of mixed mode of fracture. Micro-mechanism of failure of nodular cast irons is dependent on the method of stress.
Źródło:
Production Engineering Archives; 2014, 5, 4; 31-35
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ductile cast iron obtain by lost foam process and inmold method
Wytwarzanie odlewów z żeliwa sferoidalnego w technologii inmold i lost foam
Autorzy:
Kaczorowski, R.
Just, P.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/350916.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron (ductile cast iron)
inmold method
lost foam casting
innovative casting technologies
reaction chamber
żeliwo sferoidalne
metoda in mold
odlew z żeliwa sferoidalnego
innowacyjne technologie odlewnicze
komora reakcyjna
Opis:
This paper presents a technology of ductile cast iron obtain by lost foam process with use of inmold method. Spheroidization was carried out using master alloy in an amount of 1.5% by mass on casting iron. Research the influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidization cast iron, which estimated based on the shape of the graphite. Research have shown that the greatest impact on the degree of spheroidization has cast the infusion position relative to the casting inlet and the reaction chamber, and the shape of the reaction chamber.
W pracy przedstawiono technologię otrzymywania odlewów z żeliwa sferoidalnego metodą inmold z wykorzystaniem procesu pełnej formy. Sferoidyzację prowadzono z użyciem zaprawy sferoidyzująco-modyfikującej w ilości 1,5% na masę sferoidyzowanego żeliwa. Przeprowadzono badania wpływu konfiguracji układu wlewowego oraz kształtu komory reakcyjnej na stopień sferoidyzacji żeliwa, który określono na podstawie wskaźnika kształtu grafitu. Badania wykazały, że największy wpływ na stopień sferoidyzacji żeliwa ma położenie wlewu doprowadzającego względem odlewu i komory reakcyjnej, oraz kształt komory reakcyjnej.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 823-826
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Annealing Temperature on the Microstructure and Properties of Ausferritic Nodular Cast Iron
Autorzy:
Gumienny, G.
Klimek, L.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/383050.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting materials
innovative casting technologies
ausferritic cast iron
nodular cast iron
impact strength
annealing
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
żeliwo ausferrytyczne
żeliwo sferoidalne
siła uderzenia
wyżarzanie
Opis:
The paper presents the microstructure and selected properties of ausferritic nodular cast iron annealed at the temperature 520 and 550°C. This choice was dictated by the temperatures used in the practice of nitriding. Nodular graphite in cast iron was obtained with use of Inmold process. Cast iron containing molybdenum and copper ensuring obtaining an ausferrite in the cast iron matrix without the use of heat treatment of castings was tested. The effect of annealing temperature on the microstructure and the kind of fracture of the ausferritic nodular cast iron was presented. The effect of an annealing temperature on hardness, impact strength and the microhardness of ausferritic nodular cast iron matrix was shown too. The lamellar structure of phases in the cast iron matrix after annealing has been ascertained. There has been an increase in hardness of an annealed cast iron and microhardness of its matrix. The reduction in the impact strength of the cast iron annealed at 520 and 550°C was approximately 10-30%. Both an increase in the hardness of cast iron as well as an decrease in its impact strength is probably due to the separation of secondary carbides during the heat treatment.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphite particle size distribution in nodular cast iron
Rozkład rozmiarów cząstek grafitu w żeliwie sferoidalnym
Autorzy:
Wiencek, K.
Skowronek, T.
Khatemi, B.
Powiązania:
https://bibliotekanauki.pl/articles/263894.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
metalografia ilościowa
rozkład rozmiaru cząstek
statystyka
stereologia
algorytm Sałtykowa
żeliwo sferoidalne
quantitative metallography
particle size distribution
statistics
stereology
Saltykov algorithm
nodular cast iron
Opis:
A system of non-overlapping random spheres, whose diameters have the Weibull distribution may be used as a model for the graphite in nodule cast iron. For a given material the model probability density function of the Weibull distribution may be determined (as the first approximation) by fitting the PDF of model profile diameters to the one of graphite particle sections. The Weibull distribution may be used as the basis for quantitative metallography of the graphite phase in nodular cast iron.
Układ nienakładających się losowych kul, których średnice mają rozkład Weibulla, może być geometryczno-stochastycznym modelem dla grafitu w żeliwie sferoidalnym. Dla danego żeliwa gęstość prawdopodobieństwa rozkładu Weibulla można wyznaczyć stereologiczną metodą parametryczną poprzez dopasowanie modelowej gęstości prawdopodobieństwa rozkładu średnic przekrojów kul do danych doświadczalnych. Rozkład Weibulla może być podstawą dla metalografii ilościowej grafitu w żeliwie sferoidalnym.
Źródło:
Metallurgy and Foundry Engineering; 2005, 31, 2; 167-173
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using cored wire injection method in the production of austenitic high Ni-alloyed ductile iron castings
Wykorzystanie metody przewodów elastycznych do produkcji odlewów z wysokoniklowego żeliwa plastycznego o osnowie austenitycznej
Autorzy:
Guzik, E.
Wierzchowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/356457.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
treatment ladle
magnesium-cored wire
nodular cast iron
austenitic matrix
magnesium recovery
kadź bębnowa
żeliwo sferoidalne
żeliwo sferoidalne austenityczne
matryca austenityczna
odzysk magnezu
Opis:
Below are described results of the analysis concerning the use of two cored wire injection method (2PE- 9) and the unique application of a drum ladle as a treatment, transport and casting one, instead of a vertical treatment ladle. Parameter optimization, like: length of nodulariser wire, residual magnesium content, treatment and pouring temperature have been shown. Influence of various treatment temperatures, magnesium-cored wire velocities (Mg-treatment times) and weights of molten alloy on magnesium recovery are demonstrated. Moreover, graphite nodule content in relation to different raw materials in the charge mix are presented. Typical microstructure, mechanical properties and treatment costs are given as well. Using specific industrial conditions for tests and optimal, low scrap production of austenitic nodular cast iron (EN-GJSA-XNiSiCr35-5-2 Grade, according with EN 13835), makes this innovative method very credible. Injection of two Ø 9 mm wires; cored in FeSi + Mg nodulariser mixture and inoculant master alloy into a drum ladle is a treatment method that can be used for the production of ductile iron melted in a coreless induction furnace.
W artykule przedstawiono analizę wyników badań otrzymanych podczas produkcji żeliwa sferoidalnego, z zastosowaniem nowej metody sferoidyzacji metalu w kadzi bębnowej (w miejsce powszechnie stosowanej kadzi smukłej), przy użyciu dwóch przewodów elastycznych (technika nazwana umownie jako 2PE - 9). Kadź bębnowa z ciekłym sferoidyzowanym metalem, jest wykorzystywana do transportu ciekłego stopu i zalewania form odlewniczych. Zaprezentowano wyniki badań w zakresie optymalizacji parametrów procesu, takich jak: długości przewodu sferoidyzujacego, krytycznej zawartość magnezu, temperatury zabiegu i temperatury zalewania. Pokazano wpływ temperatury zabiegu, prędkości przemieszczania przewodu sferoidyzującego (czasu zabiegu sferoidyzowania) i masy ciekłego stopu na uzysk magnezu ze sferoidyzatora. Określono liczbę wydzieleń globularnej eutektyki grafitowej w zależności od stosowanych materiałów wsadowych. Przedstawiono mikrostrukturę wysokoniklowego, austenitycznego żeliwa sferoidalnego (zgodnie z norma PN-EN 13835, gatunku EN-GJSA-XNiSiCr35-5-2), jego właściwości mechaniczne oraz koszt obróbki pozapiecowej przy zastosowaniu metody 2PE - 9. Przeprowadzone badania zabiegu sferoidyzowania metalu bezpośrednio w warunkach przemysłowych, pozwoliły zminimalizowac wielkość braków odlewów i potwierdziły innowacyjnosc tej techniki obróbki pozapiecowej. Wprowadzenie dwóch przewodów elastycznych o średnicy Ø 9 mm; jeden wypełniony mieszanina FeSi + Mg, a drugi modyfikatorem grafityzującym, do zabiegowej kadzi bebnowej, jest nowa metoda obróbki pozapiecowej, która może być wykorzystana do produkcji żeliwa sferoidalnego.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 969-972
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of nodular cast iron metal matrix on the wear resistance
Autorzy:
Gumienny, G.
Powiązania:
https://bibliotekanauki.pl/articles/382886.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
żeliwo sferoidalne
węgliki
odporność na zużycie
innovative foundry technologies
innovative foundry material
nodular cast iron
carbides
wear resistance
Opis:
The paper presents results of studies on the effect of the nodular cast iron metal matrix composition on the abrasive and adhesive wear resistance. Nodular cast iron with different metal matrix obtained in the rough state and ADI were tested. To research of abrasive and adhesive wear the pearlitic and bainitic cast iron with carbides and without this component were chosen. The influence of the carbides amount for cast iron wear resistance was examined. It was found, that the highest abrasive and adhesive wear resistance under conditions of dry friction has a nodular cast iron with carbides with upper and lower bainite. Carbides in bainitic and pearlitic cast iron significantly increase the wear resistance in these conditions. In terms of fluid friction the largest wear resistance had cast iron group with the highest hardness.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 179-186
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 31

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