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Tytuł:
Zmiany mikrostruktury i twardości żeliwa GJS-800-8 (ADI) wywołane zmęczeniem cieplnym
Changes of microstructure and hardness of GJS-800-8 (ADI) cast iron caused by thermal fatigue
Autorzy:
Zych, J.
Wróbel, J.
Powiązania:
https://bibliotekanauki.pl/articles/380410.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zmęczenie cieplne
żeliwo sferoidalne
żeliwo ADI
struktura żeliwa
wytrzymałość na zmęczenie
thermal fatigue
ductile cast iron
ADI
cast iron structure
fatigue strength
Opis:
W pracy przedstawiono wyniki badań zmęczenia cieplnego żeliwa GJS-800-8. Określono wpływ maksymalnej temperatury cyklu (Tmax) na odporność na zmęczenie cieplne wyznaczane metodą L.F. Coffina. Opisano także zmiany struktury powodowane procesem zmęczenia cieplnego. Przedstawiono jak zmienia się twardość, która jest wyznacznikiem wysokiej wytrzymałości. Opisano zjawisko ferrytyzacji osnowy i spadku w procesie zmęczenia cieplnego twardości (HB) i związanej z twardością wytrzymałości (Rm). Wykazano iż w procesie zmęczenia cieplnego struktura żeliwa ADI ulega przemianie, osnowa ausferrytyczna jest przebudowywana najpierw w perlityczną a następnie w ferrytyczny. Wykazano, iż dodatki stopowe podnoszą znacząco wytrzymałość na zmęczenie cieplne (Mo, Ni, Cu), nie stabilizują struktury żeliwa przy jej cyklicznym nagrzewaniu, jednak spowalniają proces przemian struktury. Podniesienie temperatury cyklu cieplnego zmniejsza odporność na zmęczenie cieplne żeliwa ADI, przyśpiesza przemiany mikrostruktury oraz „z cyklu na cykl” obniża jego wytrzymałość.
The work presents results of investigations on thermal fatigue of GJS-800-8 cast iron. Influence of the maximum temperature of cycle (Tmax) on the thermal fatigue determined by L.F. Coffin method was determined. Changes of structure caused by the thermal fatigue were described. Changes of hardness of ADI cast iron during the thermal fatigue process as a function of maximum cycle temperature (Tmax) were presented. Phenomena of matrix ferritization and decrease of hardness (HB) and related to it strength (Rm) during the thermal cycle process were described. It was shown that during the thermal fatigue process structure of ADI cast iron transforms in such a way that austoferritic matrix first reconstructs to perlitic and then to ferritic one. It was proved, that alloy addition significantly increase thermal fatigue resistance (Mo, Ni, Cu) and do not stabilize cast iron structure during cyclic heating, but they slow down the changes process. Increase of the thermal cycle temperature decreases thermal fatigue resistance of ADI cast iron, and accelerates changes of its microstructure, and “cycle by cycle” decreases its strength. After exceeding Tmax=500ºC thermal fatigue process also causes decrease of hardness (HB).
Źródło:
Archives of Foundry Engineering; 2012, 12, 1s; 205-208
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The possibilities of strengthening of the surface layer of nodular iron by laser alloying with silicon nitride on the example of a rocker arm
Możliwości umacniania warstwy wierzchniej żeliwa sferoidalnego za pomocą stopowania laserowego azotkiem krzemu na przykładzie dźwigienki zaworowej
Autorzy:
Paczkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/189824.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
laser alloying
hardness
surface layer
cast iron
stopowanie laserowe
twardość
warstwa wierzchnia
żeliwo
Opis:
In the order to increase the resistance to the friction wear of machine parts appropriate surface treatment application is needed. The aim of presented research was to evaluate the laser alloying with silicon nitride effects obtained in the surface layer of nodular iron and to select the laser treatment parameters that should be appropriate for the treatment of the one of the engine parts, which is a rocker arm. After implementation of silicon nitride into the nodular iron surface layer using laser heating, a uniform, fine, dendritic microstructure similar to the hardened white cast of the allayed zone was created in all performed variants. This microstructure resulted in at least 4-times higher hardness in comparison to the core material. The hardness and the alloyed zone dimensions were dependent on the laser heat treatment variant. The laser beam power density of 41 W/mm2 and its velocity of 2.8 mm/s were selected for the treatment of the rocker arm. It was caused by the effects obtained in the surface layer. With these parameters, it was possible to achieve the hardness of 1300 HV0.1 and the width of the alloying zone of over 4 mm, which is enough to strengthen the surface area of the rocker arm most exposed to the tribological wear.
W celu zwiększenia odporności na zużycie w wyniku tarcia części maszyn potrzebna jest ich odpowiednia obróbka powierzchniowa. Celem prezentowanych badań była ocena efektów stopowania laserowego azotkiem krzemu uzyskanych w warstwie wierzchniej żeliwa sferoidalnego oraz dobór parametrów obróbki laserowej, które powinny być odpowiednie do obróbki jednej z części silnika pojazdu, jakim jest dźwigienka zaworowa. W wyniku wprowadzenia azotku krzemu do warstwy wierzchniej żeliwa sferoidalnego za pomocą nagrzewania laserowego we wszystkich przeprowadzonych wariantach wytworzona została jednorodna, drobnoziarnista i dendrytyczna mikrostruktura o charakterze zbliżonym do zahartowanego żeliwa białego. Efektem takiej mikrostruktury było uzyskanie przynajmniej 4-krotnego zwiększenia twardości w porównaniu z twardością materiału rdzenia. Twardość i wielkość uzyskanej strefy stopowanej zależały od zastosowanego wariantu laserowej obróbki cieplnej. Do obróbki dźwigienki zaworowej wybrano gęstość mocy wiązki laserowej równej 41 W/mm2&enspi jej prędkości 2,8 mm/s. Było to spowodowane tym, że w przypadku takich parametrów możliwe było uzyskanie twardości 1300 HV0.1 i szerokości strefy stopowanej ponad 4 mm, co jest wystarczające do umocnienia najbardziej narażonego na zużycie tribologiczne obszaru powierzchni dźwigienki zaworowej.
Źródło:
Tribologia; 2017, 276, 6; 71-78
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Lamellar Graphite Cast Iron Annealing on Hardness and Structure
Autorzy:
Roučka, J.
Prochazka, J.
Kana, V.
Krutis, V.
Nedelova, K.
Powiązania:
https://bibliotekanauki.pl/articles/380964.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
welding
annealing
cast iron hardness
structure stability
żeliwo
spawanie
wyżarzanie
twardość żeliwa
struktura
stabilność
Opis:
An analysis has been carried out of the influence of annealing time at the preheating temperature of 650 °C on the change in hardness and alloy structure of lamellar graphite cast iron in the working as well as in the laboratory conditions. This preheat temperature is common during reclaiming welding of castings with complex shapes. The changes in unalloyed cast iron EN-GJL 200 to EN-GJL 300 according to ISO 1690 standard and cast iron with low amount of elements such as Sn, Cu, Cr, and Mo and their combinations were assessed. It was found that the cast iron of higher strength grades has better hardness and structural stability. Cast iron alloyed with chromium or its combinations has the highest stability. In unalloyed cast iron, a partial degradation of pearlite occurs; in alloyed cast iron the structural changes are not conclusive.
Źródło:
Archives of Foundry Engineering; 2019, 4; 105-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Type of Welding Sequence During Hardfacing Chromium Cast Iron for Erosion Resistance
Autorzy:
Gucwa, M.
Bęczkowski, R.
Winczek, J.
Wyleciał, T.
Powiązania:
https://bibliotekanauki.pl/articles/382472.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloys
hardfacing
erosion
welding
hardness
stopy odporne na zużycie
napawanie
erozja
spawanie
twardość
Opis:
The paper presents the capabilities of welding techniques to creating properties of wear resistant high chromium cast iron alloy. The use of the right kind of welding sequence allows you to change the structure and properties of the obtained welds. Tests were conducted for one type of additive material in the form of self shielded core wire. In order to determine the effect of the type of welding sequence on the properties of welds performed welding using string bead and weave bead. The resulting weld was tested on hardness and research structure in an optical microscope. In the following studies have been made erosive tests wear of made hardfacing. String beads gave structure rich in carbides and harder about 270 HV of the weld with weave bead. Also, wear resistance was nearly twice as better for welds made with string beads. In the experiment a decisive role in the resistance to wear plays a high hardness of the deposit and the presence of carbides in its structure. Changes in the basic parameters of the deposition process allows for the formation of structure and properties of hardfacing welds in a wide range.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 51-54
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Addition of Titanium on The Structure and Properties of High Chromium Cast Iron
Autorzy:
Kopyciński, D.
Guzik, E.
Siekaniec, D.
Szczęsny, A.
Powiązania:
https://bibliotekanauki.pl/articles/383123.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high chromium cast iron
titanium
bending strength
hardness
microstructure
żeliwo wysokochromowe
tytan
wytrzymałość materiałów
twardość
mikrostruktura
Opis:
The paper presents results of Ti-addition to High Chromium Cast Iron (HCCI) on the structure and selected mechanical properties. For this study casted two sets of cylinders with dimensions ø20 mm, ø15 mm x 250 mm, for the High Chromium Cast Iron (HCCI) and with the 4% by mass Ti-addition. Melts were performed in the induction furnace crucible capacity of 15 kg. During the heats the cup with installed S type thermocouple was poured to record the cooling curves. The cylinders were subjected to the static bending strength test. Samples for the test microstructure and Rockwell hardness were cut from the cylinders. The study shows that the addition of titanium had an impact on the structure and thus the properties of High Chromium Cast Iron (HCCI). In subsequent studies, through an appropriate choice of chemical composition and proper process control, it is planned to obtain in the structure the titanium carbides TiC and chromium carbides with type (Cr, Fe)7C3.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-hardening of X46Cr13 Steel Integrated with Base from Grey Cast Iron in Bimetallic System
Autorzy:
Przyszlak, N.
Wróbel, T.
Powiązania:
https://bibliotekanauki.pl/articles/380104.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bimetallic casting
stainless steel
grey cast iron
hardness
microstructure
odlew bimetaliczny
stal nierdzewna
żeliwo szare
twardość
mikrostruktura
Opis:
The paper presents the technology of manufacturing layered castings, consisting of grey cast iron (base part) and high-chromium stainless steel (working part/layer). The aim of researches was an attempt of integration of heat treatment of steel X46Cr13 grade with founding of grey cast iron in bimetallic system and determination of the influence of cooling rate of bimetallic system in classical sand mould with bentonite on microstructure and hardness of the working layer. The castings were manufactured using mould cavity preparation method, where steel plate was poured by grey cast iron using different pouring temperature and thickness of base part. Then, the quality of joint between cast iron and steel plate was estimated by using ultrasonic non-destructive testing. The efficiency of heat treatment process was analysed by measurement of hardness and in metallographic examination. Conducted studies showed, that self-hardening’s ability of steel X46Cr13 let obtain technologically usable layered casting characterized by hardness of working surface up to 35 HRC.
Źródło:
Archives of Foundry Engineering; 2019, 2; 29-34
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przykład obróbki cieplnej odlewów z żeliwa wysokochromowego
Example of Heat Treatment of High Chromium Cast Iron
Autorzy:
Siekaniec, D.
Szczęsny, A.
Kopyciński, D.
Powiązania:
https://bibliotekanauki.pl/articles/380144.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obróbka cieplna
żeliwo wysokochromowe
mikrostruktura odlewu
twardość odlewu
heat treatment
high chromium cast iron
alloy microstructure
alloy hardness
Opis:
Żeliwo wysokochromowe jest powszechnie stosowanym materiałem w przemyśle górniczym i mineralnym, gdzie wymagana jest duża odporność na zużycie ścierne. Swoje dobre właściwości zawdzięcza obecności w mikrostrukturze twardych węglików. Żeliwo chromowe poddawane hartowaniu ma w praktyce osnowę austenityczną, austenityczno-perlityczną lub perlityczną. Istotnym procesem w czasie obróbki cieplnej jest tzw. destabilizacja austenitu, jest on ważny ponieważ dopiero po jego zajściu może nastąpić przemiana martenzytyczna. W zależności od szybkości chłodzenia, które następuje po procesie destabilizacji austenitu, może powstać perlit, bainit i martenzyt. Przeprowadzone badania dotyczyły określenia wpływu szybkości chłodzenia odlewów z żeliwa wysokochromowego po obróbce cieplnej, na mikrostrukturę i twardość. Badaniu zostało poddane żeliwo wysokochromowe o zawartości 27%Cr i 2,7%C. Przeprowadzono zabieg hartowania z temperatury 950 °C w czasie 4h, następnie odlewy poddano trzem wariantom chłodzenia – w wodzie, w kąpieli solnej i na powietrzu. Zbadano i porównano mikrostrukturę oraz twardość odlewów dla różnych wariantów chłodzenia.
High Chromium Cast Iron (HCCI) is widely use in mining and mineral industry, where abrasive resistance is a principal requirement. Its good properties thanks to the hard eutectic carbides occurring in the microstructure. The effect of heat treatment on HCCI was a subject of many research. High Chromium Cast Iron have an austenitic, austenitic-pearlitic or pearlitic matrix. An important process during the heat treatment is austenite destabilization, thus until after it conduct the martensitic transformation can occur. Depending on the cooling rate that follows the process of destabilization of austenite, perlite, bainite and martensite may form. The present work, aimed at studying the influence of cooling rate after heat treatment, on the microstructure and hardness. The study were carry out on samples of High Chromium Cast Iron containing 27%Cr i 2,7%C. Samples were subjected to the tempering treatment at the temperature of 950°C for 4 hours and three variants of cooling – in water, in a salt bath and on air. Examined and compared the microstructure and hardness of castings for different variants of cooling.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4 spec.; 109-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Effect of Solidification Time and Addition Amount of Inoculation on Microstructure and Hardness in Lamellar Graphite Cast Iron
Autorzy:
Çolak, Murat
Uslu, Emin
Teke, Çağatay
Şafak, F.
Erol, Ő.
Erol, Y.
Çoban, Y.
Yavuz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2203933.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lamellar graphite
graphite cast iron
inoculation
solidification time
modeling
grafit
żeliwo
wszczepienia
czas krzepnięcia
modelowanie
Opis:
Material suppliers typically recommend different additive amounts and applications for foundry practices. Therefore, even in the production of the same standard materials, different results may be obtained from various production processes on different foundry floors. In this study, the liquid metal prepared with the addition of different proportions of a FeSi-based inoculation, which is most commonly used in foundries in the production of a cast iron material with EN-GJL-250 lamellar graphite cast iron, was cast into sand molds prepared with a model designed to provide different solidification times. In this way, the optimization of the inoculation amounts on the casting structure for different solidification times was investigated. In addition, hardness values were determined depending on solidification time in varying amounts of inoculation additions. SolidCast casting simulation software was used to determine the casting model geometry and solidification time. In the scope of the study, sand casting, modeling, microstructure analysis, image analysis, microstructure analysis, and hardness tests techniques were used. When the results are examined, the required amount of inoculation for the optimal structure is optimized for the application procedure depending on the casting module and the solidification time.
Źródło:
Archives of Foundry Engineering; 2022, 22, 4; 24--33
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Molding Materials on the Self-Hardening of X46Cr13 Steel / Grey Cast Iron Bimetallic Castings
Autorzy:
Przyszlak, N.
Wróbel, T.
Dulska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2049571.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bimetallic casting
grey cast iron
tool steel
hardness
microstructure
Opis:
The paper presents the problem which concerning the technology of bimetallic castings in materials configuration: high-chromium steel as the working layer and grey cast iron as the base part. The aim of the studies was integrate the process of manufacturing of bimetallic casting with the heat treatment of hardening type of X46Cr13 steel insert by applying the mould with sandmix on a matrix of chromite sand. Range of studies included the chemical composition analysis, non-destructive ultrasonic tests to examine the quality of the permanent bond between the working layer (steel insert) and the base part (grey cast iron) of the bimetallic castings, hardness measurements as well as metallographic examinations performed on the optical and scanning electron microscopes. On the basis of obtained results was concluded that the self-hardening process occurred in the X46Cr13 steel working layer and in result of this the hardness on its surface equalled approx. 45HRC in case of the bimetallic castings with full permanent bond between both parts.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 43-50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Component Proportions in Casting Process on Hardness and the Quality of Cast Iron
Autorzy:
Saikaew, Charnnarong
Harnsopa, S.
Powiązania:
https://bibliotekanauki.pl/articles/27314151.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
sand casting
cast hardness
scrap
mixture-design
Monte Carlo simulation
odlew
twardość odlewu
złom
zawartość składników
symulacja Monte Carlo
Opis:
The purposes of this study were to investigate the impact of proportions of cast iron scrap, steel scrap, carbon and ferro silicon on hardness and the quality of cast iron and to obtain an appropriate proportion of the four components in iron casting process using a mixture experimental design, analysis of variance and response surface methodology coupled with desirability function. Monte Carlo simulation was used to demonstrate the impacts of different proportions of the four components by varying the proportions of components within ±5% of the four components. Microstructures of the cast iron sample obtained from a company and the cast iron samples casted with the appropriate proportions of the four components were examined to see the differences of size and spacing of pearlite particle. The results showed that linear mixture components were statistically significant implying a high proportion of total variability for hardness of the cast iron samples explained by the casting mixtures of raw materials. The graphite of the sample casted from the appropriate proportion has shorter length and more uniform distribution than that from the company. When varying percentages of the four components within ±5% of the appropriate proportion, simulated hardness values were in the range of 237 to 256 HB.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 35--42
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the Surface Hardness of Cast Iron by Electrodeposition of Borides in Molten Salts
Autorzy:
Al-Azzawi, A. H.
Sytchev, J.
Baumli, P.
Powiązania:
https://bibliotekanauki.pl/articles/958199.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrodeposition
boron
cast iron
Opis:
In this paper the electrodeposition of boron on the surface of cast iron as a coating is applied to increase the hardness and protect the substrate against abrasive wear. The boron containing coating was synthesized by electrodeposition process from a NaCl-KCl (1:1 mol)-10 w%NaF-10w% KBF4 molten salt. The effect of electrolysis parameters (temperature and time) on the hardness is presented; the current density varied in the range –37 – –4.5 mA/cm2, allowing perfect coverage of and respect for dimensions. The electrochemical process was carried out at different temperatures (750°C-900°C) and for different periods of time (5-10 hours). Depending on the current density and duration of electrolysis, the deposits consist of FeB or Fe2B. Microhardness measurements across the boride layer indicated very high hardness values (between 1600 and 2100 HV0.05).The structure of the boride layer is linked to its boron content and thermal history: as-deposited coatings present very small grain sizes and can be considered as nearly amorphous.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1015-1018
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grey Cast Iron Locally Reinforced Using 3D Printing Scaffold Insert
Autorzy:
Przyszlak, N.
Dulska, A.
Wróbel, T.
Szajnar, J.
Powiązania:
https://bibliotekanauki.pl/articles/380636.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grey cast iron
3D printing insert
Titanium
hardness
abrasive wear
żeliwo szare
wkład do druku 3D
tytan
twardość
zużycie ścierne
Opis:
The paper presents an innovative method of creating the layered castings. The innovation relies on application the 3D printing insert obtaining in SLM (selective laser melting) method. This type of scaffold insert made from pure Ti powder, was placed into mould cavity directly before pouring by grey cast iron. In result of used method was obtained grey cast iron casting with surface layer reinforced by titanium carbides. In range of studies were carried out metallographic researches using light microscope and scanning electron microscope, microhardness measurements and abrasive wear resistance. On the basis of obtaining results was stated that there is a possibility of reinforcing surface layer of the grey cast iron casting by using 3D printing scaffold insert in the method of mould cavity preparation. Moreover there was a local increase in hardness and abrasive wear resistance in spite of the precipitation of titanium carbides in surface layer of grey cast iron. While the usable properties of composite surface layer obtained in result of use of the method presented in the paper, strongly depend of dimensions of scaffold insert, mainly parameters Re and Ri.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors Influencing Cavitation Erosion of NiCrSiB Hardfacings Deposited by Oxy-Acetylene Powder Welding on Grey Cast Iron
Autorzy:
Szala, Mirosław
Walczak, Mariusz
Hejwowski, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2023792.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hardness
stainless steel
cavitation erosion
cast iron
surface engineering
powder welding
surface roughness
hardfacing
twardość
stal nierdzewna
erozja kawitacyjna
żeliwo
inżynieria powierzchni
spawanie proszkowe
chropowatość powierzchni
utwardzanie
Opis:
The work presents the results of a study on cavitation erosion (CE) resistance of two NiCrSiB self-fluxing powders deposited by oxy-acetylene powder welding on cast iron substrate grade EN-GJL-200. The mean hardness of deposits A-NiCrSiB, C-NiCrSiB is equal to 908 HV, 399 HV and exceeds those of EN-GJL-200 and X5CrNi18-10 reference specimens 197 HV and 209 HV, respectively. To study CE, the vibratory apparatus has been used and tests were conducted according to the ASTM G32 standard. Cavitation eroded surfaces were examined using a profilometer, optical and scanning electron microscopy. The research indicated that the CE resistance, expressed by the cumulative mass loss decreased in the following order C-NiCrSiB > A-NiCrSiB > X5CrNi18-10 > EN-GJL-200. Therefore, hardfacings were characterised by lower cumulative mass loss, in turn, higher CE resistance than the reference sample and therefore they may be applied as layers to increase resistance to cavitation of cast iron machine components. Results indicate that in the case of multiphase materials, hardness cannot be the main indicator for CE damage prediction while it strongly depends on the initial material microstructure. To qualitatively estimate the cavitation erosion damage (CEd) of NiCrSiB self-fluxing alloys at a specific test time, the following factors should be considered: material microstructure, physical and mechanical properties as well as surface morphology and material loss both estimated at specific exposure time. A general formula for the CEd prediction of NiCrSiB deposits was proposed.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 376-386
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Impact Strength and Microstructure as Quality Criteria for Selected Materials
Autorzy:
Maj, M.
Pietrzak, K.
Lasota, P.
Powiązania:
https://bibliotekanauki.pl/articles/379533.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steel
cast iron
hardness
microstructure
impact strength
stal
żeliwo
twardość
mikrostruktura
wytrzymałość
Opis:
The article presents the results of analysis of the chemical composition, hardness, microstructure and toughness of selected structural materials. The focus is on the results of impact tests carried out on the 40H steel quenched and tempered at three different temperatures, on grey cast iron used in industrial practice (cast material for brake drums) and on ADI, all of them being considered representatives of the group of materials commonly used in the production of structural elements and finished products, including items for use in the automotive industry. The impact tests were performed at a reduced temperature (-20°C), at room temperature (20°C) and at elevated temperature (150°C), comparing the results obtained with the microstructure of materials tested. It has been shown that in the case of steel, the smallest changes in microstructure cause changes in toughness, while the effect of tempering temperature is in this case of secondary importance. It was also proved that under the conditions of ambient temperature and reduced temperature, better results were obtained for ADI. At elevated temperature, better results were obtained for grey iron castings.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 199-204
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron
Autorzy:
Siekaniec, D.
Kopyciński, D.
Guzik, E.
Tyrała, E.
Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/383309.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
high chromium cast iron
inoculation
impact toughness
hardness
właściwości mechaniczne
żeliwo wysokochromowe
modyfikacja
odporność na uderzenia
twardość
Opis:
The present work, presented the study of effect of different inoculants on impact toughness in High Chromium Cast Iron. The molds were pouring in industrial conditions and samples were tested in laboratory in Faculty of Foundry Engineering at AGH. Seven samples were tested - one reference sample, three with different addition of Fe-Ti, and three with different addition of Al. The samples were subjected to impact toughness on Charpy hammer and the hardness test. The presented investigations indicate that for the each inoculant there is an optimal addition at which the sample obtained the highest value of impact toughness. For the Fe-Ti it is 0.66% and for Al is 0.17%. Of all the examined inoculants best results were obtained at a dose of 0.66% Fe-Ti. Titanium is a well-known as a good modifier but very interesting results gives the aluminum. Comparing the results obtained for the Fe-Ti and Al can be seen that in the case of aluminum hardness is more stable. The hardness of all samples is around 40-45 HRC, which is not high for this type of cast iron. Therefore, in future studies it is planned to carry out the heat treatment procedure that may improves hardness.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 85-88
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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