激光熔凝覆盖率对材料表面力学性能影响的模拟

SIMULATION OF MATERIAL SURFACE MECHANICAL PROPERTIES DUE TO LASER TREATMENT WITH DIFFERENT MSZ COVERAGE RATES

通过有限元方法 ,模拟了接触载荷下 ,激光熔凝覆盖率对材料表层循环应力幅值和表层裂纹CTOD的影响 ,从而预测了熔凝覆盖率对材料接触疲劳寿命的影响 .文中考虑了不同熔凝覆盖率的材料表面微结构形状的差异 ,不同熔凝覆盖率摩擦副的摩擦系数一样和发生变化两种情况 .结果显示 ,熔凝覆盖率为 2 0 %左右的材料表层强韧化性能最好 .

Based on the finite element method, this paper simulates the cyclic stress amplitude and CTOD values in material surfaces under contact loading. The material is treated by laser with different melting solidification zone (MSZ) coverage rates. The effect of MSZ rate on the contact fatigue life is predicted. The simulation takes into account the difference of surface contour for different MSZ rate and the influence of friction coefficients. The results show that the mechanical properties of the material surface with 20% MSZ rate are superior.