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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 3    December 2009

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Microstructure and mechanical behavior of
cold-rolled CMnAlSi TRIP-aided steel sheets
JING Cai-nian(景财年)1,2, WANG Ming-gang(王明刚)1, WANG Zuo-cheng(王作成)2,
TAN Qi-zhong(谭启忠)1, Sung-Joon KIM3

1. School of Materials Science and Engineering, Shandong Jianzhu University, Ji’nan 250101, China;
2. School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China,
3. Korea Institute of Machinery and Materials, Changwon 641010, Korea

Abstract:The microstructure, mechanical properties and retained austenite stability of CMnAlSi-TRIP steels were investigated. Optical microscopy and X-ray diffractometry were used to analyze the microstructure, volume fraction and carbon concentration of retained austenite, while the tensile tests were performed to study the retained austenite stability against strain-induced martensitic transformation. The results show that the mechanical properties of the CMnAlSi cold-rolled TRIP-aided steels fabricated by proper heat treatment display good combination of strength and ductility after isothermal bainitic transformation (IBT) treatment at 420−450 ℃ for 60−120 s. The austenite transformation kinetics is influenced significantly by the IBT temperature, and the high mechanical stability of retained austenite, governed by its carbon concentration, and determines high strain hardening during deformation.

 

Key words: transformation induced plasticity(TRIP); isothermal bainitic transformation (IBT); mechanical properties; retained austenite stability

ISSN 1672-7029
CN 43-1423/U

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