摘要
采用Formastor-FⅡ全自动相变仪测定了低合金高强钢Q890D的临界转变温度Ac_(1)、Ac_(3);并根据热膨胀法原理,采用DIL805A/D变形热膨胀相变仪测定了Q890D钢未变形与变形奥氏体在不同冷速下的连续冷却转变曲线(CCT)。结果表明:与静态CCT曲线相比,Q890D钢奥氏体经变形后相变温度升高,曲线整体向左上方移动,铁素体转变区扩大。当冷速<0.5℃/s时,变形奥氏体相变后的组织为铁素体+贝氏体;变形后马氏体开始转变温度及临界冷却转变速度提高。随冷速增大,静态CCT与动态CCT组织显微维氏硬度逐渐增大。
The critical transformation temperature Ac_(1)and Ac_(3)of Q890D low alloy high strength steel were measured by Formastor-FⅡautomatic transformation instrument.In addition,the continuous cooling transformation curves(CCT)of undeformed and deformed austenite of Q890D steel were measured by DIL805A/D deformation thermal expansion transformation instrument according to the principle of thermal expansion method.The results show that compared with the static CCT curve,the transformation temperature of austenite in Q890D steel increases after deformation,and the curve moves to the upper left as a whole,and the ferrite transformation zone expands.When the cooling rate is less than 0.5℃/s,the microstructure of deformed austenite is ferrite and bainite,and the transformation temperature and critical cooling rate of martensite increase after deformation.With the increase of cooling rate,the micro Vickers hardness of static CCT and dynamic CCT increased gradually.
作者
卢锐
高野
李志峰
陈俊
Lu Rui;Gao Ye;Li Zhifeng;Chen Jun(HBIS Group Hansteel Company,Handan,Hebei,056015;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,Liaoning,110819)
出处
《河北冶金》
2021年第4期18-22,52,共6页
Hebei Metallurgy
