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利用Sysweld有限元软件建立三维有限元模型,采用三维高斯热源,考虑材料热物性能随温度的变化,对平板和回转体内壁进行了激光相变硬化数值模拟。分析了温度场、残余应力以及马氏体分布的异同,研究了工件形状对激光相变硬化温度场和残余应力的影响规律。结果表明,在表层方向上,平板模型和回转体内壁模型的热循环相似;截面方向上,内壁模型峰值温度高于平板模型。处理后相变区组织均主要以马氏体为主,其体积分数约为90%。相变区边缘及热影响区产生残余拉应力,相变区存在残余压应力;与内壁模型相比,平板模型相变区中心残余压应力数值较大。
The finite element model of Sysweld finite element software was used to establish the three-dimensional finite element model. The three-dimensional Gaussian heat source was used to simulate the laser phase transformation hardening of the plate and the inner wall of the rotating body with the change of temperature. The similarities and differences between temperature field, residual stress and martensite distribution were analyzed. The influence of workpiece shape on temperature field and residual stress of laser phase transformation hardening was studied. The results show that in the surface direction, the thermal cycles of the flat plate model and the inner wall model of the rotating body are similar. The peak temperature of the inner wall model is higher than that of the flat plate model in the cross-section direction. After treatment, the phase-transition zone tissues are mostly martensite, with a volume fraction of about 90%. Residual compressive stress exists in the edge of the phase transition zone and the heat affected zone, and there is residual compressive stress in the phase transition zone. Compared with the inner wall model, the residual compressive stress in the center of the phase transition zone of the flat plate model is larger.