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1
Content available Eutectoid Reaction Ar1 of Cast Iron GJS-400-15 in Isothermal Conditions
Szykowny T., Romanowski Ł., Giętka T.
Archives of Foundry Engineering
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2014
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Vol. 14, iss. 3
93--98
EN
This scientific paper presents the research on influence of austenitizing temperature on kinetics and evolution of the spheroidal plain cast iron during eutectoid reaction in isothermal conditions. The cast iron has been austenitized in temperatures of 900, 960 or 1020°C. Therewere two temperature values of isothermal holding taken into consideration: 760 or 820°C. The order of creation of reaction products and their morphology have been analyzed. The particular attention has been paid to the initial stage of transformation. The qualitative research has been executed using the transmission electron microscope (TEM), as well as quantitative research (LM). The influence of austenitizing temperature has also been determined on transformation kinetics and structural composition. It was found that the increase of austenitizing temperature is conductive to the initial release of structures by metastable system. A reduction of time was observed of the initial stage of transformation at temperature close to Ar12 with its simultaneous elongation at temperature close to Ar11, with an increase of austenitizing temperature. The dependences obtained by the metallographic method confirm the prior results of dilatometric research of eutectoid reaction.
2
Content available remote The influence of the hardening conditions on the mechanical properties of ductile cast iron
Giętka T., Dymski S.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1 spec.
63--68
EN
Ductile cast iron has been austempered according to two variants. The first treatment variant was austenitizing at a temperature tγ = 830, 860 and 900 °C and holding at a temperature tpi = 400 and 300 °C for 8÷64 min. Second variant treatment was two-phase austenitizing. Firstly, it was heated at a temperature tγ = 950 °C and after forecooling and chilling at a temperature tγ' = 900, 860 and 830 °C isothermal process was conducted in the same conditions as in the first variant. The cast iron with ferritic matrix was austempered. After hardening the mechanical (Rp0,2, Rm) and plastic (A5) properties were examined as well as the microstructure of matrix and hardness. It was noticed that the heat treatment carried out according to variants I and II lead to attaining cast iron of grade: ADI EN-GJS-800-8, EN-GJS-1200-2, EN-GJS-1400-1 according to PN–EN 1564 : 2000; in addition, ductility of these grades was 1,5÷4 times bigger than the minimum standard material requirements.
3
Content available remote Influence of high – temperature strain on the structure and hardness of ductile cast iron
Szykowny T., Giętka T., Trepczyńska-Łent M.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 1 spec.
69--74
EN
Low alloy ductile cast iron was austenitized in temperature 950° or 1000 °C. Directly after austenitizing cast iron was rolled with the cold work 20 or 40 % and cooled in calm air. Next cast iron was annealed in the range of temperatures from 200÷600 °C. The following tests were performed: microscopic, x-ray diffraction and hardness.
4
Content available remote Obróbka cieplna stopowych stali konstrukcyjnych w atmosferach ochronnych z wysokimi temperaturami austenityzowania
Pawlak S., Maciosowski A., Wiedermann J., Radwański K.
Prace Instytutu Metalurgii Żelaza
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2007
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T. 59, nr 2
57-60
PL
Celem pracy było rozeznanie oddziaływania wysokich temperatur na jakość powierzchni stali i stopów specjalnych przy wykorzystaniu możliwości nowych pieców do obróbki cieplnej. Piece były również przedmiotem oceny w zakresie sterowalności, dokładności dotrzymywania temperatury (prowadzenia) i stosowania atmosfer ochronnych. Ponadto wykonano próby wykorzystania wysokich temperatur austenityzowania do obróbki cieplnej stali do ulepszania cieplnego. Możliwość wykonania precyzyjnej obróbki cieplnej w atmosferze ochronnej na skalę półtechniczną pozwoli na rozszerzenie możliwości eksperymentalnych i oferty badawczej Instytutu głównie w zakresie stali wysokostopowych i stopów specjalnych.
EN
The study was aimed at analysis of the effect of high temperatures on the surface quality of steel and special alloys using the potential of new furnaces for heat treatment. The furnaces themselfs were also subject to assessment in scope of controllability, exactness of maintaining the temperature (operation) and application of protective atmospheres. Other trials involved application of very high austenitising temperatures in heat treatment of quenched and tempered steels. The possibility of precise heat treatment inprotective atmosphere on a semitechnical scale will allow to extend the experimental capacities as well as research offer of the lnstitute, mainly as regards high-alloy steels and special alloys.
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