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

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

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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 tem-perature)),which were subjected to tensile tests at 20 and 450 ℃,respectively.The results show that compared to room temperature(20 ℃)tensile properties,the uniform elongation of the sample at high temperature(450 ℃)significantly decreased.Specifically,the uniform elongation of the sample austempered above Ms decreased from 8.0％to 3.5％,and the sample austempered below Ms decreased from 10.9％to 3.1％.Additionally,the tensile strength of the sample austempered above Ms significantly decreased(from 1281 to 912 MPa),and the sample austempered below Ms slightly decreased(from 1010 to 974 MPa).This was due to the high carbon content(1.60 wt.％),high mechanical stability,low thermal stability for the retained austenite of the sample austempered below Ms.Besides,the retained austenite decomposed at high temper-atures,the carbon content and transformation driving force were significantly reduced,the transformation rate increased,and the phase transformation content reduced.

Ultra-fine bainiteIsothermal treatmentHigh-temperature tensile propertyRetained austenite stabilityPlastic deformation

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

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The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Zhejiang Tsingshan Iron and Steel Co.,Ltd.,Qingtian 323903,Zhejiang,China

National Natural Science Foundation of ChinaLeading Innovation and Entrepreneurship Team in Zhejiang ProvinceKey Research and Development Program of Hubei ProvinceScience and Technology Program of Guangxi Province111 Project

520712382021R010202021BAA057AA22068080

2024

10.1007/s42243-023-01151-9

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(8)