小切深磨削条件下工件表面硬化机理

以位错运动造成塑性变形的理论为基础，深入分析了小切深条件下磨削力机械作用硬化机理和材料热相变硬化机理。通过不同磨削参数的小切深磨削硬化试验，分析磨削硬化过程中不同磨削参数条件对工件表面强化层形成的影响及其金相组织转变的情况，深入研究磨削强化层组织的形成机理。试验结果表明，小切深条件下磨削加工试件表面的硬化主要以位错运动而产生的强化层为主，提高磨削深度和降低工件进给速度会增大工件表面显微残余应力，增强试件表层硬化层的形成效果。

Surface Hardened Mechanism of Grinding Conditions in Small Depth of Cut

Grinding hardening technology was the technology that made the surface layer of the work-piece hardened by using grinding force and grinding heat. Grinding surface hardening process in small depth cut was usually generated by mechanical force and accompanied with thermal strain and phase transition occurred. Based on the theory of plastic deformation caused by dislocation motion, in-depth analyzed the hardening mechanism of mechanical action by grinding force and material thermal phase transformation in small depth cut. Test shows that using larger grinding depth and smaller workpiece feed speed in the grinding can increase the surface microscopic residual stress and promote the effect of the specimen surface hardening layer formation.