摘要
利用Thermo-Calc热力学软件(TCFE 9数据库)、DIL805A/D变形热膨胀相变仪和场发射扫描电镜(FE-SEM)研究了连续冷却转变及等温转变过程中无钛热冲压成形钢的微观组织演化规律。结果表明:试验钢的Ac_(1)=749℃,Ac_(3)=863℃。绘制了CCT曲线和TTT曲线;无钛热冲压成形钢的马氏体相变开始温度Ms=385℃,马氏体相变结束温度Mf=130℃。过冷奥氏体冷却过程中,发生马氏体相变的临界冷却速度为5℃/s;当等温温度高于750℃时,热冲压成形后可获得全马氏体组织。
Using Thermo-Calc thermodynamics software(TCFE 9 database), DIL805 A/D deformation thermal expansion phase changer and field emission scanning electron microscope(FE-SEM), the law of microstructure evolution of a titanium-free hot stamping steel during continuous cooling transformation and isothermal transformation was studied. The results show that the Ac_(1) and Ac_(3) of the steel is 749 ℃ and 863 ℃, respectively, and the corresponding CCT curve and TTT curve are drawn. The martensitic transformation start temperature of the titanium-free hot stamping steel is 385 ℃, and the martensitic transformation finish temperature is 130 ℃. During the cooling process of supercooled austenite, the critical cooling rate for martensite transformation is 5 ℃/s;when the isothermal temperature is higher than 750 ℃, the full martensite structure can be obtained after hot stamping.
作者
耿吴宾
崔青玲
梁佳伟
朱宗伟
张龙超
Geng Wubin;Cui Qingling;Liang Jiawei;Zhu Zongwei;Zhang Longchao(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China;Yucaitang(Suzhou)Material Technology Co.,Ltd.,Suzhou Jiangsu 215000,China;Xichang Steel and Vanadium Co.,Ltd.,Xichang Sichuan 615000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第12期149-155,共7页
Heat Treatment of Metals
基金
攀西试验区第四批项目——钒纳米析出韧化2GPa热冲压钢开发。
关键词
无钛热冲压成形钢
连续冷却转变
等温转变
临界冷却速度
titanium-free hot stamping steel
continuous cooling transformation
isothermal transformation
critical cooling rate
