激光相变硬化蠕墨铸铁气门座应力场数值模拟研究  

Numerical Simulation Study on Stress Field of Laser Transformation Hardening Vermicular Graphite Cast Iron Valve Seat

作　　者：庞铭 谭雯丹 付威 张啸寒 江国业[1] PANG Ming;TAN Wendan;FU Wei;ZHANG Xiaohan;JIANG Guoye(Airport College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《热加工工艺》2018年第24期218-222,225,共6页Hot Working Technology

摘　　要：采用有限元软件ANSYS建立了气门座激光相变硬化的应力场数值模拟三维有限元模型,分析了激光扫描速度对气门座瞬态应力场与残余应力场的影响。结果表明:气门座激光扫描区域的周向应力大于径向应力,更易产生径向裂纹;随着激光扫描速度的增加,气门座周向与径向的瞬态压应力与残余拉应力均减小。在气门座激光相变硬化过程中,提高激光扫描速度可以更好地控制径向裂纹的形成。A three-dimensional finite element model for numerical simulation of laser transformation hardening stress field of valve seat was established by using the finite element software ANSYS. The effect of the change of laser scanning velocity on the transient stress field and residual stress field of the valve seat was analyzed. The results show that the circumferential stress of the laser scanning area of the valve seat is larger than the radial stress, and the radial crack is more likely to occur;with the laser scanning velocity increasing, the transient compressive stress and residual tensile stress of the valve seat in both circumferential and radial directions decrease. In the laser transformation hardening process of the valve seat, increasing the laser scanning velocity can better control the formation of radial cracks.

关 键 词：气门座 激光 相变硬化 应力场 

分 类 号：TG156.1[金属学及工艺—热处理]