Prediction and evaluation of optimum quenching temperature and microstructure in a 1300 MPa ultra-high-strength Q&P steel

作     者：Peng-fei Gao Ju-hua Liang Wei-jian Chen Feng Li Zheng-zhi Zhao Peng-fei Gao;Ju-hua Liang;Wei-jian Chen;Feng Li;Zheng-zhi Zhao

作者机构：Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern TransportationBeijing100083China Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsChinese Academy of SciencesHefei230031AnhuiChina 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2022年第29卷第2期

页      面：307-315页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：The authors gratefully acknowledge the support of the National Key Research and Development Program of Thirteenth Five-Year Plan Period(Grant No.2017YFB0304400) Production and Application Demonstration Platform of New Energy Automotive Material(Grant No.TC180A6MR-1) 

主　　题：Quenching and partitioning Constrained carbon equilibrium Retained austenite Martensite start temperature Plasticity Quenching temperature 

摘      要：The quenching and partitioning steel is the representative of the third generation of advanced high-strength *** effect of quenching temperature on the microstructure and mechanical property of ferrite-containing quenching and partitioning steel was studied by intercritical annealing quenching and partitioning *** preparing a test steel with a tensile strength of 1300 MPa and total elongation of 19%,it is found that the actual optimum quenching temperature was lower than that calculated according to the constrained carbon *** results indicate that the martensite start temperature of the austenite was overestimated when considering the diffusion of carbon *** grain size which is affected by low temperature and the existence of ferrite during intercritical annealing influenced the optimum quenching temperature.A scheme considering the diffusion of various alloying elements and austenite grain size was proposed and *** this scheme,the optimum quenching temperature of intercritically annealed quenching and partitioning steel with complex microstructures was well predicted.