High-temperature stability of retained austenite and plastic deformation mechanism of ultra-fine bainitic steel isothermally treated below Ms

Ting-ting He,Feng Hu,Kun Wang, Wen Zhou, Li Li,Serhii Yershov,Kai-ming Wu

Journal of Iron and Steel Research International(2024)

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摘要
The mechanical properties of the sample and the stability of retained austenite were studied by designing two kinds of ultra-fine bainitic steel with different heat treatment methods (austempering above and below Ms (martensite start temperature)), which were subjected to tensile tests at 20 and 450 °C, respectively. The results show that compared to room temperature (20 °C) tensile properties, the uniform elongation of the sample at high temperature (450 °C) significantly decreased. Specifically, the uniform elongation of the sample austempered above Ms decreased from 8.0
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关键词
Ultra-fine bainite,Isothermal treatment,High-temperature tensile property,Retained austenite stability,Plastic deformation
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