Effect of isothermal transformation treatment and tempering on the microstructure and hardness of a medium c and high si steels

Date

2021-01-01

Author

KAFADAR, Gülten
Kalkanlı, Ali
ÖZDEMİR, ABBAS TAMER
Ögel, Bilgehan

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This research work aims to study the effect of 2wt%Mo on bainitic transformation kinetics and bainite morphology in 0.6wt%C-1.2wt%Si-1.0wt%Mn-0.2wt%Cr steel. Specimens are austenitized at 950°C and rapidly cooled in salt bath and isothermally treated between 200°C-300°C for different time intervals. Another set of specimens are rapidly cooled in oil after an austenitization treatment and then tempered in the temperature range of 200°C-550°C. In C-Mn-Si specimens, the amount of retained austenite increases with increasing the amount of bainite but no retained austenite is observed in bainitic C-Mn-Si-Mo specimens. The tempering behavior of C-Mn-Si-Mo alloy is considerably different than that of the Mo free alloy. Mo in a martensitic microstructure of C-Mn-Si-Mo alloy shows the secondary hardening effect peak upon tempering at 500°C. The examination of the secondary hardening would also contribute to the behavior of Mo in tempered bainitic steels. The bainitic specimens do not show a peak hardness but softening is retarded upon tempering at the same temperature range.

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106667493&origin=inward
https://hdl.handle.net/11511/91099

Journal

ISIJ International

DOI

https://doi.org/10.2355/isijinternational.isijint-2020-419

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

G. KAFADAR, A. Kalkanlı, A. T. ÖZDEMİR, and B. Ögel, “Effect of isothermal transformation treatment and tempering on the microstructure and hardness of a medium c and high si steels,” ISIJ International, pp. 1679–1687, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106667493&origin=inward.