塑性变形在淬硬钢磨削白层形成中的作用机理

对淬硬轴承钢GCr15进行了磨削实验,采用热电偶和三向压电晶体测力仪测量了磨削温度和磨削力.通过X射线衍射仪对磨削表面残余奥氏体含量、马氏体亚晶粒尺寸以及微观应变进行了分析.通过有限元分析软件仿真计算了工件表面的接触应力和应变,讨论了塑性变形在磨削白层形成中的作用.结果表明:法向磨削力引起材料的强烈塑性变形和高接触应力;工件表面高的接触应力能降低材料相变温度,促进相变的发生;强烈的塑性变形能细化晶粒作用;磨削白层的厚度随着塑性变形的增加而增加,而其亚晶粒大小随塑性变形的增加而减小.

Action Mechanism of Plastic Deformation on the Grinding White Layer of Harden Bearing Steel

The grinding temperature and the grinding force were measured by using the thermocouple technique and 3-axis piezoelectric dynamometer in the grinding process of GCr15 harden steel.The residual austenite content,the subgrain size of the martensite and the micro-strain in the grinding surface were analyzed on the basis of X-ray diffraction(XRD) examinations of the microstructure.The contact stress and the plastic strain of the grinding surface were simulated by using the finite element method(FEM).The effect...