基于预应力加载的淬硬表面强化层厚度预测

发布时间：2018-03-31 16:19

本文选题：预应力磨削淬硬　切入点：热相变　出处：《东北大学学报(自然科学版)》2017年03期

【摘要】：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.
[Abstract]:In order to evaluate the influence of prestress parameters on the thickness of grinding strengthened layer on workpiece surface, The unquenched 45 steel specimens were subjected to different prestressing forces of 0 ~ 100 MPa and surface grinding hardening. The grinding hardening process was simulated by means of thermo-mechanical sequential loading in the finite element software ANSYS. This paper analyzes the influence of thermal transformation and work hardening on the thickness of work hardening layer, and discusses the thickness distribution of work hardening layer at different locations from the starting point. The simulation results of the thickness of hardened layer agree with the experimental data, and the error is less than 6. At the same time, The result that the thickness of the strengthened layer on the grinding surface is reduced slightly by prestressing force is proved to increase the distribution of the microstructure of the material and restrain the dispersion of quenched carbides, but it may not be a factor conducive to the increase of the thickness of the hardened layer.
【作者单位】：东北大学机械工程与自动化学院;新疆工程学院机械工程系;中国第一汽车集团公司技术中心;
【基金】：国家自然科学基金资助项目(51375083) 沈阳市科学技术计划项目(F13-316-1-59)
【分类号】：TG580.6

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