Refinement of retained austenite in super-bainitic steel by a deep cryogenic treatment

Hu, Feng; Wu, Kaiming; Hodgson, Peter Damian and Shirzadi, Amir Abbas (2014). Refinement of retained austenite in super-bainitic steel by a deep cryogenic treatment. ISIJ International, 54(1) pp. 222–226.

DOI: https://doi.org/10.2355/isijinternational.54.222

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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About

• Item ORO ID
• 44230
• Item Type
• Journal Item
• ISSN
• 0915-1559
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	Wuhan University of Science & Technology

• Keywords
• cryogenic treatment; retained austenite; martensite; super-bainitic steel.
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2014 ISIJ
• Depositing User
• Amir Shirzadi