针对一挖掘机回转铁道的早期断裂失效现象进行了研究,分别从材料成分,组织,性能、生产工艺及使用环境因素等方面分析了失效摸式和失效机理.认为由于生产过程中焊接操作不当对一次焊缝区的组织及性能产主了不利的影响,并产生了裂纹、挖补后在残余应力及环境因素的综合作用下导致了准解理脆性断裂、并提出了相应的预防措施 Aiming at the early fracture failure of an excavator rotary railway, the failure modes and failure mechanisms were analyzed respectively from the aspects of material composition, organization, performance, production process and environmental factors, etc. It is considered that due to improper welding operation in the production process Once the weld zone organization and performance of the main adverse impact and produce cracks, after digging up the residual stress and environmental factors under the combined effect of leading to the quasi-cleavage brittle fracture and put forward the corresponding preventive measures