Bake harden behavior and microstructure evolution of automotive DP780 steel
LI Hui1,2，SHI Chun-li1,2，YIN Hong-xia1，ZHU Zhen-feng1
（1. College of Engineering， Yantai Nanshan University， Yantai 265713， Shandong， China 2. National Engineering Research Center for Plastic Working of Aluminum Alloys， Shandong Nanshan Aluminum Co.， Ltd.， Yantai 265700， Shandong， China）
Abstract：The influence of pre-strain and bake process on harden ability of DP780 steel was studied. The mechanical properties was tested and the microstructure was investigated by optical microscope，TEM and EBSD. The results indicate that with the increasing of pre-strain，the BH value has increasing trend in the beginning and reaches the peak value（45 MPa）while the pre-strain is 8%，and then has a decreasing trend. The influence of pre-strain on BH value is based on the influencing on movable dislocation density. With the increasing of bake temperature and time，the BH value has a increasing trend. The BH value improves 30 MPa while the bake temperature enhances from 150 to 210 ℃，while only 10 MPa when bake time enhances from 20 to 100 min. This presents that the bake temperature has more obvious effect.
收稿日期: 2017-06-05
出版日期: 2018-02-05
引用本文:
李 辉，史春丽，尹红霞，祝贞凤. DP780 双相钢烘烤硬化行为及微观组织演变[J]. , 2018, 53(1): 79-82.
LI Hui，，SHI Chun-li，，YIN Hong-xia，ZHU Zhen-feng. Bake harden behavior and microstructure evolution of automotive DP780 steel. Iron and Steel, 2018, 53(1): 79-82.
2018, Vol. 53 
