闪速加热对2000 MPa级热成形钢显微组织和力学性能的影响

谢泽东, 丁灿灿, 温鹏宇, 罗海文

Effect of Flash Heating on Microstructure and Mechanical Properties of 2000 MPa Hot Stamping Steel

XIE Zedong, DING Cancan, WEN Pengyu, LUO Haiwen

图4 热成形钢闪速加热和常规加热至不同温度后形成的组织与析出相

Fig.4 Microstructures and precipitates formed in the hot stamping steels subjected to both the flash heating and conventional heating to 850, 900, and 950oC (a-c) SEM images of FH850 (a), FH900 (b), and FH950 (c) specimens (α and θ represent ferrite and cementite, respectively) (d-f) SEM images of CH850 (d), CH900 (e), and CH950 (f) specimens (g-i, l) TEM images (g, h) and statistical size distributions of cementite particles (i, l) in FH850 (g, i) and FH900 (h, l) specimens (j, k) EDS linear composition measurements on cementite in FH850 (j) and NbC in FH900 (k) indicated by yellow circles in Figs.4g and h, respectively