摘要
采用DIL805L型膨胀仪测得了钻头用15CrNiMn钢的奥氏体连续冷却转变(CCT)曲线,研究了试验钢在不同冷却速率下的相变过程、显微组织和硬度。结果表明:试验钢在很宽的冷速范围内均出现贝氏体组织,铁素体、珠光体转变区和贝氏体转变区完全分离;随着冷却速率增加,试验钢的室温组织逐渐细化,硬度明显增大。
The austenite continuous cooling transformation （CCT） curves of 15CrNiMn steel for drilling bit were determined by DIL80SL dilatometer. The phase transformation, microstructure and hardness of the tested steel at different cooling rates were studied. The results show that the bainite structure was obtained in the tested steel over a large range of cooling rates, and the transformation zones of ferrite or pearlite and bainite were separated completely. With the cooling rate increasing, the microstructure of the tested steel became finer and the hardness increased obviously.
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第2期40-42,共3页
Materials For Mechanical Engineering
基金
河北省科技计划项目(14211014D)
