基于预应力加载的淬硬表面强化层厚度预测

Surface Grinding Hardness Layer Thickness Prediction Under Pre-stress Loading Condition

为评估预应力磨削加工中,预应力参量对工件表面磨削强化层厚度的影响,对未调质45钢试件施加0~100 MPa不同预应力并进行表面磨削淬硬.在有限元软件ANSYS中用热-力顺序加载的办法模拟磨削加工淬硬过程,分析热相变和加工硬化对加工硬化层厚度的影响,探讨距切入点不同位置的加工硬化层厚度分布.硬化层厚度仿真结果与试验数据相符,误差小于6%.同时,加载预应力导致磨削表面强化层厚度出现小幅减薄(<10%)的结果,证实加载预应力加剧材料组织重分布,抑制了淬火碳化物的弥散,但可能并非是利于硬化层厚度增加的因素.

To evaluate the effect of pre-stress parameter on hardening-layer thickness during grinding process, surface grinding hardening process was applied to unquenched 45 # steel workpiece at different pre-stress（ 0 ~ 100 MPa） conditions. In a sequence of ＂thermal-force ＂loading order, grinding hardening process was simulated using the ANSYS software.Furthermore,howthermal transformation and work hardening influence layer thickness and thickness distribution at different location from grinding wheel ＇s entry point were discussed.Thickness simulation data shows that the calculation error is less than 6%,indicating that the results are in good agreement with the experimental data. Meanwhile,the pre-stress loading leads to the slight reduction of thickness（ 10%） on the surface grinding hardening-layer,which proves that loading pre-stress provokes re-distribution of microstructure,suppresses diffusion of quenched carbide,but probably is not a beneficial factor to increase hardening layer thickness.