Modeling of Microstructure Evolution in 22MnB5 Steel during Hot Stamping

作     者：Li-juan ZHU Zheng-wei GU Hong XU Yi L Jiang CHAO 

作者机构：College of Materials Science and EngineeringJilin University Technology CenterChangchun Railway Vehicles Co.Ltd. Advanced Manufacture Technology CenterAcademy of Machinery Science and Technology 

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

年 卷 期：2014年第21卷第2期

页      面：197-201页

核心收录：

学科分类：082304[工学-载运工具运用工程] 08[工学] 080204[工学-车辆工程] 0802[工学-机械工程] 0823[工学-交通运输工程] 

基　　金：Item Sponsored by Major Project of Ministry of Industry and Information Technology of China(2009ZX04014-072) Basic Research Project of Jilin University of China(200903019) 

主　　题：22MnBS hot stamping, transformation martensite 

摘      要：Automobile manufacturers have been inereasingl^r adopting hot-stamped parts for use in newly designed ve- hicles to improve crash worthiness and fuel efficiency. However, the simulation of hot stamping is rather complex and challenging, and further research still needs to be done on hot stamping hardening mechanism. The microstruc- ture evolution and hardening mechanisms during hot stamping of 22MnB5 steel were thoroughly investigated, using information provided in the literatures as well as experimental results. New models were developed to predict the grain growth during heating and the flow stress of a manganese boron steel （22MnB5） with high hardenability by the Gleeble simulation experimental results. The deformed austenite decomposition during stamping and quenching was emphatically quantified based on the transformation thermodynamic and kinetic theories, and the relationship of mi- crostructure to properties was analyzed. The results showed that the optimal process to obtain homogeneous and small lath martensite is heating at 900--950 ℃ for 5 min and then auenching at 50 ℃/s with a Dressing time about 8 s.