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实现了对应力场随时间变化的动态模拟分析,发现熔覆层纵向应力最大,横向应力次之,厚度方向应力最小;熔覆层中心一直处于拉应力状态并产生拉伸塑性变形;三向拉应力在材料进入弹性状态后,表现为横向和厚度方向上的拉应力明显下降,纵向应力基本保持不变;对于材料的拉伸或压缩塑性变形,热应变起到决定作用;分析送粉式激光熔覆内应力的产生机理表明,熔覆层中心靠近基体区域对裂纹最敏感,该区域处于第三类主应变状态。
The dynamic simulation analysis of the stress field with time has been carried out. It is found that the longitudinal stress of the cladding layer is the largest, the transverse stress is the second, and the stress in the thickness direction is the smallest. The center of cladding layer is in the state of tensile stress and tensile plastic deformation occurs. Stress in the material into the elastic state, the performance of the horizontal and thickness direction of the tensile stress decreased significantly, the longitudinal stress remained unchanged; for tensile or compression plastic deformation, thermal strain play a decisive role; analysis of powder-fed laser The mechanism of internal stress in the cladding shows that the center of cladding layer is the most sensitive to the crack near the base region, and the region is in the third type of main strain state.