自蔓延反应喷涂锻造温度场和残余应力的数值模拟

Simulation of Temperature Field and Residual Stress of SHS Reactive Spraying Forging

采用ANSYS有限元软件对钢板表面反应预涂TiCNi涂层以及反应喷涂后锻造两种加工过程的温度场和残余应力场进行了模拟计算和比较,得到了各涂层基体喷涂锻造温度场规律。基体高温时喷涂锻造可以降低涂层试件的冷却速度,从而减缓裂纹的产生;研究了反应喷涂锻造对涂层残余应力的影响。结果表明:锻造后各层中的残余应力远小于锻造前各层中的残余应力,而提高始锻造温度可以减小涂层中残余应力。

Using the ANSYS finite element software, the temperature field and the residual stress field during reactive pre-coating forging and reactive spraying forging of TiCNi coating on the surface of steel were computed and compared. Distribution law of the spraying forging temperature for each coating was obtained. When the temperature of substrate is high, the cool-down rate of the coating can be reduced by spraying forging, so the fatigue can be slowed down. The influence of reactive spraying forging on the residual stress of the coatings was also studied. The results show that the residual stress after forging is far less than that before forging, and the increase of initial forging temperature can decrease the residual stress of the coating.