Below-Ms austempering to obtain refined bainitic structure and enhanced mechanical properties in low-C high-Si/Al steels

A novel heat-treatment process, below-Ms austempering, was performed on two low-C high-Si/Al steels, and accordingly the resultant microstructures and mechanical properties were investigated. The results showed that bainitic transformation occurs at isothermal temperatures below Ms and unexpectedly,...

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Bibliographic Details
Published in:Scripta materialia 2016-02, Vol.112, p.96-100
Main Authors: Zhao, Leijie, Qian, Lihe, Meng, Jiangying, Zhou, Qian, Zhang, Fucheng
Format: Article
Language:English
Subjects:
Aluminum
Austempering
Bainitic steel
Heat treatment
Martensite
Martensitic transformations
Mechanical properties
Phase transformation
Steels
Transformations
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Summary:A novel heat-treatment process, below-Ms austempering, was performed on two low-C high-Si/Al steels, and accordingly the resultant microstructures and mechanical properties were investigated. The results showed that bainitic transformation occurs at isothermal temperatures below Ms and unexpectedly, the transformation process is accelerated significantly by the prior formation of martensite. Furthermore, as compared with the conventional above-Ms austempering process, the below-Ms austempering refines effectively the bainitic plates and reduces the size and volume fraction of blocky martensite/austenite phases, giving rise to much enhanced impact toughness and improved tensile properties. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.09.022