Grind-strengthening represents a novel surface modification process that combines a precision removal process of material and the strengthening function of surface modification. The high heat and severe plastic deformation (SPD) of the ground superficial layer can induce the phase transformation and dynamic recrystallization (DRX) grain refinement behavior. Consequently, the prediction and control of the ground superficial layer microstructure is of considerable significance to improve the wear resistance and fatigue resistance performance of parts. Firstly, the dynamic mechanical properties at high temperature and shock compression were tested by the split Hopkinson pressure bar (SHPB) experiment for 40Cr steel. The material's constitutive relations, critical strain and DRX model can be determined. Subsequently, the finite element (FE) method was proposed to predict the temperature and strain distribution of the ground strengthening layer. The DRX volume fraction and grain size of the ground superficial layer can be realized via Abaqus/explicit user subroutine VUHARD. Finally, a phenomenological simulation of the ground strengthening layer microstructure is realized utilizing the cellular automata (CA) method combined with FE analysis results. With the help of grind-strengthening experiments, the gradient distribution of grain refinement layer at different cutting depths is consistent with the prediction results. The proposed DRX and microstructure predicted model can provide theoretical support for the surface strengthening of steel grinding. The modification behavior of the gradient refinement induced by grind-strengthening has significant application potential in the fields of transmission parts such as gears and shafts.

磨削强化是一种新型的表面改性工艺，它结合了材料的精密去除工艺和表面改性的强化功能。地表表层的高温和剧烈塑性变形（SPD）可诱发相变和动态再结晶（DRX）晶粒细化行为。因此，地面表层微观结构的预测和控制对于提高零件的耐磨性和抗疲劳性能具有重要意义。首先，通过霍普金森压杆（SHPB）实验对40Cr钢进行高温和冲击压缩动态力学性能测试。可以确定材料的本构关系、临界应变和DRX模型。随后，提出了有限元（FE）方法来预测地基加固层的温度和应变分布。地面表层的 DRX 体积分数和晶粒尺寸可以通过 Abaqus/显式用户子程序 VUHARD 实现。最后，利用元胞自动机（CA）方法结合有限元分析结果，实现了地基加固层微观结构的唯象模拟。借助磨削强化实验，不同切削深度的晶粒细化层梯度分布与预测结果一致。所提出的DRX和显微组织预测模型可为钢磨削的表面强化提供理论支持。