航空发动机轴承在使用过程中出现早期剥落。采用宏观检验、化学分析、力学性能测试、金相检验、能谱等手段对轴承内滚道表面剥落原因进行了分析,结果表明:剥落轴承内圈存在锻造过烧,形成孔洞缺陷,破坏了金属连续性,降低了轴承接触疲劳强度,在交变应力的作用下,以孔洞为核心,其周围形成“蝶形”组织,产生显微裂纹向滚动接触表面扩展,形成剥落,引起轴承疲劳失效。由此提出,通过控制锻造工艺及增加锻造缺陷的检测手段来防止锻造过烧,进而提高轴承使用寿命。 Aero-engine bearings show early spalling during use. The reason of surface spalling on bearing was analyzed by macroscopical test, chemical analysis, mechanical property test, metallurgical test and energy spectrum. The results show that the inner ring of spall bearing has the defects of forging overburning, forming hole defects and destroying the metal Continuity, reduce the contact fatigue strength of the bearings, under the action of alternating stress, the hole as the core, the formation of “butterfly ” tissue around, resulting in micro-cracks extending to the rolling contact surface, the formation of spalling, bearing fatigue Failure. It is proposed by controlling the forging process and increase the detection of forging defects to prevent over-burning forging, thereby increasing the bearing life.