【摘要】 研究了贝氏体钢经高应力冲击磨损后，试样表层内的组织变化及裂纹形成与扩展特征。实验发现，高应力冲击磨损后，磨损试样表层形成高硬度的白层与变形层。在白层与变形层内均产生不同程度的损伤裂纹。受力后损伤裂纹将向基体内和白层内扩展。裂纹在白层内的快速扩展造成表面白层的脆性剥落。在实验的基础上，作者提出了高应力冲击磨损的白层剥落机制模型。更多还原

【Abstract】 The characteristics of microstructure changes and the formation and propagation of cracks on sample surface layer have been studied in this paper through high stress impact wear for bainitic steel. The experimental results show that the high hardness white layer and plastically deformed zone are developed on the surface layer under high stress impact wear. Different damage cracks are formed inside the white layer and deformed zone. These cracks will propagate into matrix and white layer under impact stress. The rapid propagation of these cracks along the white layer can develop brittle delamination of white layer. Based on the experimental results, the model for delamination mechanism of white layer under high stress impact wear is proposed.更多还原