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Tytuł:
The Effect of a Change in Recrystallization Annealing Time on the Properties and Structure of Cold-Drawn Wires
Autorzy:
Grygier, D.
Rutkowska-Gorczyca, M.
Dudziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/99719.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
pearlitic steel
annealing
cementite
Opis:
Although many heat treatment schemes have been developed for pearlitic steel, in the literature there is still little information about the influence of the different heat treatment parameters on the percentage, properties and morphology of the phases. Neither there is any information on matching the parameters, taking into account the different degree of deformation of the steel wires, the particular applications and operating conditions of the products. The aim of this research was to optimize the parameters of the interoperation annealing used during the cold plastic work-ing of pearlitic steel intended for cold-drawn wires. The results of the hardness measurements and microscopic observations, presented in this paper clearly show that there is no need to apply long recrystallization treatments to small diameter wires. This finding is highly significant from the economic point of view and it clearly shows the importance of the individual matching of heat treatment parameters to specific industrial applications.
Źródło:
Journal of Machine Engineering; 2015, 15, 1; 90-97
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Heat Treatment Parameters for Pearlite Steel Intended for Cold Plastic Working
Autorzy:
Grygier, D.
Powiązania:
https://bibliotekanauki.pl/articles/99395.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
drawing
pearlite
cementite
coagulation
tempering
Opis:
One of the problems widely discussed in the relevant literature is the fatigue cracking of pearlite steel subjected to cold plastic working, as well as of that being currently in operation. Studies presented in the work were aimed at selection of the parameters, and mainly the time, of heat treatment operations of pearlite steel enabling obtaining cold drawn wires characterised with better plastic properties and higher fatigue resistance than the products achieved during standard processes. The idea of modification was based at possibility of obtaining steel of the sorbite, which are a mixture of ferrite and dispersion cementite of high degree of coagulation. The structures obtained with this method, as being globular, should be featured with better plastic properties than the lamellar structures created during standard diffusion transformation of austenite. In addition the discussed change was to enable decreasing the total surface of interphase boundaries at which the highest delaminations of structure were observed, regardless of whether the cause of the change resulted from presence of non-metallic inclusions or pile-up of dislocations.
Źródło:
Journal of Machine Engineering; 2016, 16, 2; 44-51
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structural and Strength Changes Resulting from Modification of Heat Treatment of High Carbon Steel
Autorzy:
Grygier, D.
Rutkowska-Gorczyca, M.
Jasiński, R.
Dudziński, W.
Powiązania:
https://bibliotekanauki.pl/articles/356063.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pearlit
cementite
spheroidization
plastic working
Opis:
Pearlitic steels containing from some 0,8 to 0,95% C belong to the group of unalloyed steels intended for cold drawing or rolling. One of the problems discussed in literature is cracking of pearlitic steel subjected to plastic working, caused by high brittleness of the lamellar precipitations of hard cementite. This issue is extremely important because it affects significantly reduce fatigue strength. The paper presents proposals to modify the process of heat treatment, results in getting a steel with spheroidal structure characterized by better plastic properties, in order to eliminate this problem.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 971-976
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of spheroidization pearlitic steel with regard to the degree of plastic deformation
Autorzy:
Grygiel, D.
Dudziński, W,
Gerstein, G.
Nürnberger, F.
Powiązania:
https://bibliotekanauki.pl/articles/1190029.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stal perlityczna
wyżarzanie
cementyt
pearlitic steel
annealing
cementite
Opis:
Pearlitic steels containing from some 0,8 to 0,95% C belong to the group of unalloyed steels of the quality class destined for cold drawing or rolling, they find application mainly as wires used for reinforcement of tires, hoses or rope production. However this group of steels characterized low machinability, as a consequence of presence hard plates of cementite, the intervention ameliorative this property is spheroidizing annealing. The object of the tests presented in paper was wires of pearlitic steel obtained after the successive stages of cold plastic working. The aim of the tests was to show that the condition of the material and mainly degree of plastic deformation have a clearly influence on the effectiveness of pearlitic steel spheroidization.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2015, 3, 1; 6--9
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Microstructure in High Temperature Tribology of Iron Alloys
Autorzy:
Krawczyk, J.
Rożniata, E.
Zimowski, S.
Kot, M.
Dąbrowski, R.
Dziurka, R.
Frocisz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/355366.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
tribology
iron alloys
cast steel
wear
cementite
Opis:
The present paper describe the issue of tool materials wear in a high temperature conditions. The investigations were performed at the cast steel tool material at the tribological contact to the structural steel. The investigations aim was to determine the role of microstructure in a tribological properties between the structural steel and tool material. The results of such investigation could be referenced to the industry conditions and could answer about the problems of tool materials wear. The observations of the wear mechanisms were referred to the microstructure of the mill rolls. The laboratory tests ware aimed at evaluating the thermal treatment modification effect on the cast steels properties. A significant role of the morphology of ledeburitic cementite and secondary cementite on the tribological properties was exhibited. The investigations assumed the presence of an austenitic matrix with primary and secondary cementite. Influence of varying morphology carbides was described. in the cast steel microstructure. The investigation results make possible to point to a direction of carbide morphology change with the purpose of obtaining the assumed properties of hot operation tools.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 915-920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of recrystallization high carbon steel with regard to the condition of material
Autorzy:
Grygier, D.
Powiązania:
https://bibliotekanauki.pl/articles/1190026.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rekrystalizacja
cementyty
stal perlityczna
starzenie
recrystallization
pearlitic steel
annealing
cementite
Opis:
The main aim of the studies presented in paper was to optimize the parameters of the recrystallisation annealing process used in the course of cold plastic working of high carbon steel for patented wires. Object of the research described in the work was eutectoid steel of 0,8% content of C designated for production of colddrawn wires applied for reinforcement of car tires, hoses and ropes. The results of tests show that the condition of the material and mainly degree of plastic deformation has a clearly influence on the effectiveness of pearlitic steel recrystallisation.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2015, 3, 1; 20--24
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the causes of damage to the wires of the steel belt of car tires
Autorzy:
Grygier, D.
Powiązania:
https://bibliotekanauki.pl/articles/1190015.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ogumienie
pas napędowy
stal perlityczna
cementyt
tire
belt
pearlitic steel
cementite
Opis:
The main when buying car tires we would like them to serve us as long as possible while the experts recommend their replacement after six years at the latest – is it really necessary? In this work the analysis of the impact of car tires operation on microstructure of the steel belt wires has been presented. The results of the presented research have proven that as a result of the complex stresses in the belt wire material the transverse cracks of individual cementite lamellae appear. The observed structural changes are a major cause of fatigue cracks development and finally result in breaking continuity of steel belt wires, breakthrough of the rubber layer and eventually damage to the tires, preventing their further work.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2016, 4, 1; 45--49
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation on Divorced Eutectoid Growth of Cementite in Eutectoid Steel
Autorzy:
Biswas, Prasenjit
Maity, Joydeep
Powiązania:
https://bibliotekanauki.pl/articles/355620.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 1080 steel
incomplete austenitization
cementite
divorced eutectoid growth
analytical model
Opis:
Divorced eutectoid growth of cementite in AISI 1080 steel is investigated as a function of cooling rate for incomplete austenitization-based heat treatment. Furthermore, a fundamental mathematical relationship is established through analytical treatment that correlates divorced eutectoid growth with effective cooling rate and degree of undercooling in view of bulk diffusion controlled growth model. As the cooling rate increases, the divorced eutectoid growth of cementite is gradually ceased. The result predicted by the analytical model closely matches with the experimental result (%Deviation ≤ 7).
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1171-1176
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Peculiarities of Alloying Effect on the Eutectic Cementite Behavior Under Hot Rolling
Autorzy:
Mironova, Tatiana
Proidak, Svetlana
Powiązania:
https://bibliotekanauki.pl/articles/27315804.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
cast iron
cementite
deformation
phase transformations
ductility
żeliwo
cementyt
odkształcenie
przemiany fazowe
plastyczność
Opis:
Currently, cast iron remains one of the major modern casting materials in metallurgy and machine-building industry and is sure to take the lead in the future. Chilled cast iron has high hardness and wear resistance due to a large number of carbide phases in its structure. However, low ductility and impact hardness essentially limit its applicability in terms of processing. Hot plastic working, under which the eutectic net crushing is observed, appears to be one of the most effective means of the eutectic alloy products shape and microstructure transformation. Chilled cast iron properties fundamentally improve after hot plastic working: ductility, strength and impact hardness increase by 2-3 times on retention of the high hardness factor. Chilled cast iron ductility increase can be attained when using phase transformations in eutectic cementite under lean alloying with carbide forming elements. The purpose of the paper is to study alloying effect on the chilled cast iron ductility as well as eutectic cementite behavior under hot rolling. In the paper hardening and softening of the structural components in chilled cast iron under hot working have been studied. The deformation texture forming in eutectic cementite under hot rolling has been revealed, which is connected with the dynamic softening and depends on the degree and the nature of its alloying. The mechanism and regularities of the phase transformation effect in cementite on its behavior under plastic deformation and on the alloys ductility in general have been studied. In cementite chromium alloying initiates processes, that can be characterized as the pre-precipitation stage of the new phases, and this way it contributes to the cast iron ductility reduction and embrittles cementite. Carbide transformation, that occurs in eutectic cementite under alloying with vanadium, stimulates softening of the alloy and increases its ductility level. Moreover, the multiple glide planes {130},{011},{112} in cementite have been determined. It has been found out, that in supersaturated cementite vanadium carbides precipitation stimulates the extra glide plane {111} occurrence under hot rolling. The essence of the carbide transformation phenomenon is that under hot working there occurs the lubricating effect at the transition of the metastable iron carbide condition, which is strengthened with vanadium supersaturation and mechanical hardening, to a more stable condition due to precipitation of the proeutectoid constituents on the one hand, and because of the dynamic softening processes on the other hand. At that, the autocatalyticity effect is observed: there is precipitation of carbides with hardening and softening, similar to the processes that arise as a result of the superplastic effect induced by phase transformations.
Źródło:
New Trends in Production Engineering; 2019, 2, 2; 289-300
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preconditiong and Inoculation of Low Sulphur Grey Iron
Autorzy:
Hossain, Md Sojib S.
Bazlur B. Rashid, A. K. M.
Powiązania:
https://bibliotekanauki.pl/articles/380548.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grey iron
metallography
mechanical properties
cementite
preconditioner
inoculant
żeliwo szare
metalografia
właściwości mechaniczne
cementyt
Opis:
For quality grey cast iron production, the challenging issues are to avoid cementite structure and obtain the desired graphite morphology with proper matrix as well as hardness. The objective of the present research is to find out the right combination of preconditioner and inoculant that may help to overcome the challenges. In this work, sulphur content is kept low (0.01%). Two preconditioners namely metallurgical SiC and zirconium bearing FeSi with two types of inoculant are individually used to make four combinations of sample and for each case metal is poured into the green sand mould. Finally Brinell hardness and graphite morphology is observed in the thickest and thinnest portions of the castings. Metallurgical SiC with barium bearing inoculant gives better graphite morphology and hardness than strontium bearing inoculant, on the other hand zirconium bearing FeSi gives more satisfying result than SiC with every type of inoculant. Among all of the combinations Zr bearing preconditioner with Ba bearing inoculant gives good graphite morphology with best mechanical properties in both thickest and thinnest portions of the casting.
Źródło:
Archives of Foundry Engineering; 2020, 20, 1; 61-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The high-temperature tribology of iron matrix hypoeutectic alloy after under-annealing normalizing
Tribologia wysokotemperaturowa stopu odlewanego na osnowie żelaza po normalizowaniu niezupełnym
Autorzy:
Krawczyk, J.
Dziurka, R.
Rożniata, E.
Powiązania:
https://bibliotekanauki.pl/articles/264155.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
staliwo
cementyt drugorzędowy
zużycie
ledeburyt przemieniony
współczynnik tarcia
cast steel
secondary cementite
wear
transformed ledeburite
friction coefficient
Opis:
This work includes the results of high-temperature tribology test of cast alloy with iron matrix. The paper presents the discussion on the results of the studies of wear mechanisms and friction factor of G200CrNiMo4-3-3 adamite cast steel after three variants of under - annealing normalization. During the heat treatment of cast steel four annealing temperatures were applied: 850, 900, 950 and 1050°C. Annealing was conducted for 10 h, and then the samples were cooled at a rate of 48°C/h to room temperature. Four different annealing temperatures resulted in adequate differences in microstructure of test cast steel what determinated tribological properties of the material. Results obtained allow for determination of optimal, from wear resistance point of view, microstructure of test cast steel used for mill rolls.
Niniejsza praca zawiera wyniki wysokotemperaturowego testu tribologicznego stopu odlewanego na osnowie żelaza. W pracy tej przedstawiono dyskusję wyników badań mechanizmów zużycia oraz współczynnika tarcia staliwa adamitowego G20CrNiMo4-3-3 po trzech wariantach normalizowania niezupełnego. Podczas obróbki cieplnej staliwa zastosowano cztery temperatury wyżarzania: 850, 900, 950 i 1050°C. Wyżarzanie prowadzono przez 10 h, później próbki chłodzono z szybkością 48°C/h do temperatury pokojowej. Cztery różne temperatury wyżarzania spowodowały odpowiednie różnice w mikrostrukturze badanego staliwa, co z kolei zdeterminowało własności tribologiczne materiału. Uzyskane wyniki badań pozwalają na określenie optymalnej, z punktu widzenia odporności na zużycie, mikrostruktury badanego staliwa, stosowanego na walce hutnicze.
Źródło:
Metallurgy and Foundry Engineering; 2008, 34, 2; 125-131
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Ledeburite in EDS Analyses of Directionally Solidified Eutectic White Cast Iron
Autorzy:
Trepczyńska-Łent, Małgorzata
Seyda, J.
Powiązania:
https://bibliotekanauki.pl/articles/2203938.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microsegregation
SEM-EDS analysis
ledeburite
cementite
white cast iron
mikrosegregacja
analiza SEM-EDS
ledeburyt
cementyt
żeliwo białe
Opis:
The paper addresses the microsegregation of Mn, Mo, Cr, W, V, Si, Al, Cu and P in the white cast iron. Eutectic alloy with the content of 4.25% C was studied. The white cast iron was directionally solidified in the vacuum Bridgman-type furnace at a constant pulling rate v=83 μm/s and v=167 μm/s and at a constant temperature gradient G = 33.5 K/mm. The microstructural research was conducted using light and scanning electron microscopy. The microsegregation of elements in ledeburite was evaluated by EDS measurements. Content of elements in ledeburitic cementite and ledeburitic pearlite was determined. The tendency of elements to microsegregation was found dependent on the solidification rate. Microsegregation of elements between pearlite and cementite structural constituents has been specified. The effect of solidification rate on the type and intensity of microsegregation in directionally solidified eutectic white cast iron was observed. A different type of microsegregation was observed in the components of ledeburite in cementite and pearlite.
Źródło:
Archives of Foundry Engineering; 2022, 22, 4; 65--71
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of metallurgical defects and microstructure on failure formation in roll necks of cast iron rolls
Rola wad metalurgicznych oraz mikrostruktury w powstawaniu uszkodzeń czopów żeliwnych walców hutniczych
Autorzy:
Krawczyk, J.
Pacyna, J.
Powiązania:
https://bibliotekanauki.pl/articles/264314.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
żeliwo
walce hutnicze
rzadzizna
ledeburyt
cementyt drugorzędowy
grafit
cast iron
mill rolls
shrinkage porosity
ledeburite
secondary cementite
graphite
Opis:
This work presents the examples of structural reasons for failure of the necks of cast iron rolls. The most common reason for damage of metallurgical roll necks is a presence of shrinkage porosity in their volume. Moreover, a high fraction of ledeburitic cementite can lead to the formation of a continuous net of eutectic carbides, which facilitate cracking. Even very thin net of secondary carbides, formed on the boundaries of former grain of austenite, can significantly facilitate propagation of the crack. Continuous net of ledeburitic cementite, in the case of its precipitation in a form of bands and existence of hardened areas in the alloy matrix can lead to roll neck fracture relatively easy. The use of flake graphite cast iron for metallurgical rolls increases a risk of the fracture of roll neck.
W niniejszej pracy przedstawiono przykłady strukturalnych przyczyn uszkodzeń czopów w żeliwnych walcach hutniczych. Najczęstszą przyczyną uszkodzeń czopów walców hutniczych jest zaleganie w nich obszarów rzadzizn. Ponadto duży udział cementytu ledeburytycznego może prowadzić do powstania ciągłej siatki węglików eutektycznych, która tworzy drogę łatwego pękania. Nawet bardzo cienka siatka węglików drugorzędowych utworzona na granicach pierwotnego ziarna austenitu może w znaczący sposób ułatwiać rozwój pęknięcia. Ciągła siatka cementytu ledeburytycznego, w przypadku jego wydzielania w postaci pasmowej oraz występowanie w osnowie obszarów podhartowanych, może doprowadzić do łatwego złamania czopa walca. Zastosowanie na walce hutnicze żeliwa z grafitem płatkowym zwiększa niebezpieczeństwo złamania czopa.
Źródło:
Metallurgy and Foundry Engineering; 2007, 33, 2; 89-96
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of plastic deformation carbon steel on the process of burning electric arc
Autorzy:
Vakulenko, Igor Alex
Plitchenko, Sergey
Kurt, Bulent
Askerov, Hangardas
Proydak, Svetlana
Erdogdu, Ahmet Emrah
Powiązania:
https://bibliotekanauki.pl/articles/2091226.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
substructure
density dislocation
electric current
plastic deformation
cementite
ferrite
podbudowa
dyslokacja gęstości
prąd elektryczny
deformacja plastyczna
cementyt
ferryt
Opis:
During a study of the combustion process of a direct polarity electric arc, a directly proportional dependence of the electric current value on the degree of cold plastic deformation of carbon steel used as an electrode was found. To calculate the value of the electric current during arc burning, in the indicated ratio, it was proposed to replace the surface tension force of the liquid metal with the surface tension of ferrite of plastically deformed carbon steel. Calculation of the ferrite’s surface tension value on the deformation degree of the steel under study through the size of the coherent scattering regions was used to explain the observed dependence of the electric current during arc burning. From the analysis of the considered correlation ratios, it was found that with an increase in the cold deformation degree, the refinement of the coherent scattering regions results in the ferrite’s surface tension increase and consequently, to an increase in the electric current during arc burning. Comparative analysis of the obtained results of calculating the value of electric current during arc burning through the surface tension of ferrite of cold-deformed carbon steel showed a fairly good coincidence with experimental data. The differences did not exceed 9%.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 112; 211--218
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solidification conditions of gray and white cast iron. Part II - Experimental verification
Warunki krystalizacji żeliwa szarego i białego. Część II - Weryfikacja doświadczalna
Autorzy:
Fraś, E.
Górny, M.
Lopez, H.F.
Powiązania:
https://bibliotekanauki.pl/articles/263924.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
zabielenia
skłonność żeliwa do zabieleń
eutektyka grafitowa
eutektyka cementytowa
żeliwo
chill
chilling tendency
graphite eutectic
cementite eutectic
cast iron
Opis:
In this work, an experimental verification of the theoretical principles for the transition from gray to mottled and white cast iron solidiflcation is presented. Experimental tests have been implemented using plate and wedge shaped castings of various sizes. The experiments inctuded inoculated and non-inoculated cast irons of different chemical compositions and time after the inoculation treatment. In addition, thermal analysis tests were employed to determine the degree of undercooling of graphite eutectic deltaTm. This included microstructural evaluations in order to establish the density of eutectic grain (cells). This procedure enabled the calculation of the theoretical grain density (cell count) N, the wedge value w, as well as the chilling tendency CT of cast iron. It was found that the predietions of the theoretical analysis are in good agreement with the experimental outcome for the chill exhibited in wedge and plate shaped castings.
W pracy przedstawiono wyniki badań mających na celu doświadczalną weryfikację teoretycznego modelu przejścia od krystalizacji żeliwa szarego do połowicznego i białego. W badaniach doświadczalnych wykorzystano odlewy w kształcie płyt o zróżnicowanej grubości ścianki oraz odlewy w kształcie klina. Badaniami objęto żeliwo nie modyfikowane oraz modyfikowane, o różnym składzie chemicznym i różnym czasie po modyfikowaniu. Dodatkowo wykonano analizę termiczną żeliwa oraz badania struktury w celu określenia odpowiednio: stopnia przechłodzenia eutektyki grafitowej deltaTm oraz gęstości ziaren (komórek) eutektyki grafitowej. Zastosowana procedura pozwoliła obliczyć teoretyczną gęstość ziaren (liczbę komórek) N, liczbę klinową w, a także skłonność żeliwa do zabieleń CT. Wykazano dobrą zgodność wyników obliczeń z danymi doświadczalnymi, które uzyskano dla odlewów w kształcie płyt i klinów.
Źródło:
Metallurgy and Foundry Engineering; 2005, 31, 1; 37-52
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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