钢基表面热喷镍冷却过程中热力耦合场的三维有限元分析

3D finite element analysis of thermo-mechanical coupled field in solidification process during thermal spraying

以某钢基表面热喷镍工艺为例,对凝固冷却过程进行了简化和合理假设,基于ANSYS平台,建立了热力耦合场的三维有限元模型并进行了求解,获得了应力场和温度场分布规律,分析了涂层上某些关键点的温度和应力随时间变化的情况,讨论了涂层厚度对涂层/基体界面应力的影响.结果表明,凝固冷却时,涂层温度场沿中心向外边缘逐渐降低,随时间延长呈下降趋势;基体温度场随时间的变化呈先增加后降低趋势;涂层主要承受残余压应力,随涂层厚度增加,残余应力呈增大趋势.

With proper simplifications and assumptions, 3D finite element model of thermal-mechanical field was developed based on ANSYS software to numerically simulate distribution of temperature and stress fields upon solidification after thermally spraying nickel on steel substrate. The evolution of temperature and stress with time at some important spots in the coating was obtained and the effect of coating thickness on the stress in the interface between the coating and substrate was analyzed. The results show that the temperature in the coating gradually decreased from the center to the border. The residual stress on the coating was compressive, and increased with the increase of coating thickness.