WC_p增强钢基复合材料淬火后残余应力模拟分析

Residual Stresses Simulation of WC_p Reinforced Steel Matrix Composites after Quenching

采用数值模拟的手段,对碳化钨（WC）颗粒增强钢基复合材料的淬火过程进行了弹塑性有限元分析。用X射线衍射的方法测量了复合材料淬火后的表面残余应力,并与模拟数据进行了对比。结果表明：淬火后的WC颗粒增强的钢基复合材料表面受压应力。立方体颗粒增强的复合材料表面应力的模拟值与实验值更接近。在增强颗粒分布形式相同时,立方体颗粒增强的复合材料最大应力幅值比球形颗粒高出约0.5倍,正八面体颗粒增强的复合材料最大应力幅值比球形颗粒高出约0.4倍。球形颗粒增强的复合材料内部产生裂纹的几率和加工硬化程度均小于其他两种形状。

The quenching process of tungsten carbide particles reinforced steel matrix composites were analyzed by usingelastic-plastic finite element method. The surface residual stress of the composites after quenching were measured by meansof X-ray diffraction method, and the experimental results were compared with the simulation data. The results show that thestress on the surface of the composites after quenching is compressive. The simulated value of residual stresses on surface ofthe cubicparticlesreinforced composite is closer to the experimental data. In the case of same particle distribution form, themaximum first principal stress amplitude of the cubic particles reinforced composites is about 0.5 times higher than that of thespherical particles reinforced composites, while the maximum first principal stress amplitude of the regular octahedral particlesreinforced composite is about 0.4 times higher than that of the spherical particles reinforced composites. The crackingprobability and work hardening degree of the spherical particles reinforced composite is smaller than that of the compositeswith the other two shapes reinforcement.