【作者】 许文博； 魏绍鹏； 石伟； 王罡； 融亦鸣；

【Author】 Xu Wenbo;Wei Shaopeng;Shi Wei;Wang Gang;Yiming Rong;Department of Mechanical Engineering,Tsinghua University;

【机构】 清华大学机械工程系；

【摘要】 FV520B马氏体沉淀硬化不锈钢具有优良的力学性能,是生产离心式压缩机零部件的重要材料。研究FV520B奥氏体化过程和组织演变规律是合理制定激光熔覆修复工艺的重要依据。通过热膨胀实验测得了在不同加热速度条件下FV520B钢奥氏体化的膨胀量变化曲线,研究了不同加热速度对相变特征温度和连续奥氏体化动力学的影响。建立FV520B钢奥氏体化的相变动力学模型,并对其准确性与使用范围进行验证和分析。采用作者建立的连续奥氏体化动力学模型,计算了圆盘工件加热、保温与淬火过程的温度与组织转变。更多还原

【Abstract】 FV520B steel has excellent mechanical properties.It has been used for producing centrifugal compressor parts.The austenite transformation and microstructure evolution rule is the theoretical basis of laser cladding process formulation.In this paper,the dilatometric curves subjected to different heating rates were obtained by the dilatometer.The effect of heating rate on austenitization critical temperature and kinetics was investigated.The austenitization kinetics model of FV520 B steel was established.A thermal-microstructure coupled model for the quenching process of large wheel blank part was achieved by the secondary development of Abaqus,which based on the austenitization kinetics model.The temperature history and the transformation evolution during the heat treatment process was presented.更多还原