圆柱滚子轴承滚动体表面裂纹性质对比分析

Compare and Analysis of Cylindrical Rolling Element Bearing Surface Cracks Nature

某型航空发动机支点所用的圆柱滚子轴承工作后,发现一个滚动体表面出现裂纹,该滚动体材质为W9Cr4V2Mo。通过对该滚动体表面裂纹的外观形貌观察、能谱分析和金相分析,并将检测结果与材质为M50和GCr15的圆柱滚子轴承表面裂纹进行了对比分析。得出W9Cr4V2Mo材质滚动体表面裂纹是产生于该滚动体加工所用圆棒的冷拉成型过程中,这一裂纹性质为锻造折叠缺陷。

A rolling surface crack of the cylindrical roller bearings used in an aeroengine fulcrum is found after work, the material for rolling elements is W9Cr4V2Mo. Through the morphology observation, energy spectrum analysis and metallographic analysis of the rolling surface morphology crack, and the test results are compared with the material for MS0 and GCrl5 of cylindrical roller bearing surface crack, it is obtained that the material surface cracks of W9CI4V2Mo rolling body is produced in the process of rolling the rod used in the cold - drawn molding process, the crack nature is forging folding defects.