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利用ANSYS软件,基于遗传算法和神经网络对多道激光熔覆温度场和应力场进行有限元分析,发现多道熔覆过程中,温度场椭圆偏向已形成熔覆层的一侧;多道熔覆前面道次的熔覆相当于对后续的熔覆有预热作用;熔覆层纵向应力最大,横向应力次之,厚度方向应力最小;而熔覆层中心一直处于拉应力状态;纵向拉应力高出横向和厚度方向应力几倍,并且在熔覆层与基体结合区域达到最高值。因此推断横向裂纹是最主要的裂纹形式,而且熔覆层心部或与基体结合区是裂纹高发区,这与试验结果相吻合。
Finite element analysis of temperature field and stress field of multi-pass laser cladding based on genetic algorithm and neural network using ANSYS software found that during the multi-pass cladding, the temperature field ellipses deviate to the side where the cladding layer has been formed. The cladding in the front pass is equivalent to the preheating effect on the subsequent cladding. The longitudinal stress in the cladding layer is the largest, the transverse stress is the second, the stress in the thickness direction is the minimum, and the center of cladding layer is always in the state of tensile stress. The longitudinal tensile stress Higher than the lateral and thickness stress several times, and in the cladding layer and the substrate to reach the highest value. Therefore, it is inferred that the transverse cracks are the most important crack forms, and the core of the cladding layer or the bond area with the matrix is the crack-prone area, which agrees well with the experimental results.