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为了研究固态相变对马氏体钢激光熔覆成形过程应力演化的影响,建立了考虑降温过程马氏体相变的热-力耦合激光单道熔覆及多层多道堆积有限元模型。在实测材料物性参数的基础上,对单道熔覆及多层多道堆积应力演化进行了有限元分析。分析结果表明,马氏体相变对应力场演化影响显著,同只考虑热-力耦合的模型计算结果相比,考虑固态相变的情况下,有限元结果同实验值比较吻合,残余应力水平显著降低,且分布规律明显不同。
In order to study the influence of solid phase transformation on the stress evolution during laser cladding of martensitic steel, a finite element model of multi-layer and multi-layer deposition of thermo-mechanical coupled laser cladding and martensite transformation during cooling process was established. Based on the measured physical parameters, the finite element analysis of single-pass cladding and multi-layer multi-channel accumulation stress evolution was carried out. The results show that the martensitic transformation has a significant effect on the evolution of stress field. Compared with the calculation results only considering the model of thermo-mechanical coupling, the finite element results are in good agreement with the experimental ones under the condition of solid phase transformation. The residual stress level Significantly lower, and the distribution of the law was significantly different.