摘要
采用Gleeble 3500型热模拟试验机,测定了微铌高钼型H13热作模具钢(%,0.027Nb,2.39Mo)以不同冷却速度冷却时的膨胀曲线,并结合金相法和硬度法绘制了该钢的冷却转变曲线(CCT)。根据测得的CCT曲线,分析了不同冷却速度下连续冷却时的组织转变;阐明了冷却速度与组织演变及硬度变化之间的关系。结果表明:该实验钢临界点为A_(c1)=830℃、A_(c3)=927℃;钢中的Mo、Nb元素显著的提高了钢的淬透性,马氏体转变的临界冷却速度大于1℃/s;为生产实践和新工艺的制定提供了参考依据。
The different dilatometric curve of continuous cooling transformation about the hot working die steel(%,0.027Nb,2.39Mo)were measured by Gleeble 3500 thermal mechanical simulation.By dilatometric change and metallographic organization analysis referencing hardness measurement,the cooling transformation curve(CCT)was plotted.Based on the measured CCT curves,the transformation of microstructure is analyzed during continuous cooling at different cooling rates,the relationship between cooling rate and microstructure evolution and hardness changes is clarified.The results show that the critical point is Ac1=830℃,Ac3=927℃.The Mo and Nb elements significantly improve the hardenability of the steel,the critical cooling rate of martensitic transformation is greater than 1℃/s,which can provide a reference for the production practice and the formulation of new technology.
作者
张洪
李天生
刘新彬
ZHANG Hong;LI Tian-sheng;LIU Xin-bin(School of Mechanical Engineering,Hunan Institute of Technology,Hengyang 421008,China;Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《内燃机与配件》
2019年第8期103-106,共4页
Internal Combustion Engine & Parts
基金
湖南省自然科学基金(2019JJ60027)
湖南省教育厅科学研究项目(17C0428)
湖南科技大学机械设备健康维护湖南省重点实验室开放基金(201603)
湖南工学院博士课题启动基金(HQ14008)
