The rolling wear experiments of CL65 wheel steel and U75V rail steel were carried out on a double-disk rolling wear tester to study the fatigue wear phenomenon on the surface of CL65 wheel steel. During the experiment, it is found that the wear condition of CL65 wheel steel is changed from adhesive wear to fatigue wear. The fine grain layer on the machined surface mainly appears in the initial stage of wear, and the formation and propagation of fa-tigue wear cracks are easy to appear in the fine grain layer or the interface between the fine grain layer and the ma-trix, which leads to the early fatigue peeling off of the fine grain layer. With the continuous increase of wear cy-cles, the plastic deformation of the surface layer of the original flake pearlite plus syntectoid ferrite is increased continuously. When the plastic strain is too large, the fatigue crack begins to germinate and gradually began to ex-pand in the region of proeutectoid ferrite and the interface between cementite and eutectoid ferrite.
关键词
CL65车轮钢/摩擦磨损/疲劳磨损/滚动接触疲劳/显微组织演化
Key words
CL65 wheel steel/friction and wear/fatigue wear/rolling contact fatigue/microstructure evolution
维普
万方数据