ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Refinement of Retained Austenite in Super-bainitic Steel by a Deep Cryogenic Treatment
Feng HuKaiming WuPeter Damian HodgsonAmir Abbas Shirzadi
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2014 Volume 54 Issue 1 Pages 222-226

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Abstract

The effect of a deep cryogenic treatment on the microstructure of a super-bainitic steel was investigated. It was shown that quenching the super-bainitc steel in –196°C liquid nitrogen resulted in the transformation of retained austenite to two phases: ~20 nm thick martensite films and some nano carbides with a ~25 nm diameter. Some refinement of the retained austenite occurred, due to formation of fine martensite laths within the retained austenite. The evolution of these new phases resulted in an increase in the average hardness of the super-bainitic steel from 641 to ~670 HV1.

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© 2014 by The Iron and Steel Institute of Japan
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