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Chen, Lian-sheng; Hu, Bao-jia; Song, Jin-ying; Zhang, Jian-yang; Zheng, Xiao-ping; Wei, Ying-li; Tian, Ya-qiang
Cai liao gong cheng = Journal of materials engineering, 02/2017, Volume: 45, Issue: 2Journal Article
The microstructure, retained austenite and mechanical property of low-carbon steels with different precursor microstructures were studied by means of intercritical reheating-quenching and partitioning (IQ&P) processes. The results show that the structure of IQ&P-I multiphase steel with precursor ferrite + pearlite (F+P) is blocky ferrite, martensite (M). The blocky retained austenite(RA) of IQ&P-I multiphase steel exists in the boundary of ferrite and martensite and film-like retained austenite distributes around the lath martensite as the shape of thin slice. The transformation induced plastic effect of IQ&P-I multiphase steel with less content of retained austenite is unapparent. The tensile strength of IQ&P-I multiphase steel reaches 957 MPa, but the tensile elongation is only 20%, and the production of strength and elongation is 19905.6 MPamiddot%. The structure of IQ&P-II multiphase steel with precursor martensite is needle or lath grey-black ferrite and martensite. The fine needle like martensite is d
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