调心滚子轴承感应淬火工艺与组织性能的数值模拟

基于电磁场-温度场-组织场-应力应变场耦合模型,利用DEFORM软件模拟双列调心滚子轴承内圈感应淬火过程,并提出分段电流密度的淬火工艺,研究了轴承内圈感应淬火过程中温度变化、组织演变以及表层与次表层硬度、残余应力和残留奥氏体等。结果表明:分段电流密度的感应淬火方法能够使轴承内圈淬硬层均匀分布;加热效率随线圈电流密度增加而增大,且尖角位置温度会出现突变;淬火后滚道表面残留奥氏体含量约为6.97%,马氏体含量约为92.3%,表面硬度约为60.9 HRC,滚道淬硬层约为2.97 mm;深冷处理后残留奥氏体含量与残余应力降低,马氏体含量与硬度均提高;残余应力沿内圈中心径向平面对称分布,且次表层残余应力最大;数值模拟结果与试验具有一致性。

Numerical simulation of induction hardening process and microstructure performance of spherical roller bearing

Based on the coupling model of electromagnetic field, temperature field, microstructure field and stress/strain field, the induction hardening process of inner ring of double row spherical roller bearing was simulated by DEFORM software, and the quenching process of sectional current density was put forward. The temperature change, microstructure evolution, surface and subsurface hardness, residual stress and retained austenite during induction hardening of spherical roller bearing inner ring were studied. The results show that the induction hardening method of sectional current density can make the hardened layer of the inner ring of the bearing distribute uniformly, the heating efficiency increases with the increase of current density of coil, and the temperature at the cusp position changes sharply. After quenching, the retained austenite content on the raceway surface is about 6.97%, the martensite content is about 92.3%, the surface hardness is about 60.9 HRC, and the thickness of the raceway hardened layer is about 2.97 mm. After cryogenic treatment, the retained austenite content and residual stress decrease, the martensite content and hardness increase, the residual stress distributes symmetrically along the radial plane of the center of the inner ring, and the residual stress in the subsurface layer is the largest. The numerical simulation results are in good agreement with the experimental results.