Thermo-kinetic design of retained austenite in advanced high strength steels

被引：46
作者：
Dai, Zongbiao [1 ]
Ding, Ran [1 ]
Yang, Zhigang [1 ]
Zhang, Chi [1 ]
Chen, Hao [1 ]
机构：
[1] Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing, Peoples R China
来源：
ACTA MATERIALIA | 2018年 / 152卷
基金：
中国国家自然科学基金; 国家重点研发计划; 北京市自然科学基金; 中国博士后科学基金;
关键词：
Local equilibrium; Isothermal bainitic transformation; Quenching and partitioning; Retained austenite; TRANSFORMATION-INDUCED PLASTICITY; COUPLED-SOLUTE DRAG; X-RAY-DIFFRACTION; DUAL-PHASE STEELS; MEDIUM MN STEEL; MECHANICAL-PROPERTIES; PARTITIONING Q; BAINITE TRANSFORMATION; CARBON ENRICHMENT; FERRITE FORMATION;
D O I：
10.1016/j.actamat.2018.04.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Design of metastable retained austenite has been one of the most key issues in the development of advanced high strength steels (AHSSs) as mechanical properties of AHSSs are directly linked to the amount of retained austenite and its stability. In the past decades, several approaches, e.g. isothermal bainitic transformation, quenching & partitioning, austenite reversion transformation et al. have been successfully proposed to obtain retained austenite in the AHSSs. However, up to now, optimization of alloy composition and processing parameters in the above approaches is primarily by "trial and error" experiments or thermodynamic calculations. In this study, an integrated thermo-kinetic computational model, in which thermodynamics-kinetics of phase transformations and alloying elements partitioning are carefully considered, is used to design multi-phase microstructure of AHSSs with an emphasis on retained austenite. The current model is benchmarked by a comparison with the available experimental data for the conventional transformation-induced plasticity and quenching & partitioning steels, and the effects of alloy composition and processing parameters on the amount of retained austenite and its composition will also be discussed. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：288 / 299
页数：12
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