51CrV4弹簧钢环箍断裂失效分析  

Fracture Failure of 51CrV4 Ring Band

作　　者：张凯[1,2] 王长朋 佘祖新[1,2] 文邦伟 谭勇[1,2] 

机构地区：[1]西南技术工程研究所,重庆400039 [2]重庆市环境腐蚀与防护工程技术研究中心,重庆400039

出　　处：《装备环境工程》2018年第3期86-91,共6页Equipment Environmental Engineering

摘　　要：目的研究51Cr V4弹簧钢环箍出现断裂失效原因。方法通过化学成分分析、力学性能分析、断口扫描分析、显微组织分析及能谱分析测试手段,对51Cr V4弹簧钢环箍的断裂模式及失效原因进行分析。结果长时间处于拉应力状态,致使51Cr V4弹簧钢环箍内表面棱边萌生裂纹源;同时,在腐蚀介质和应力的协同作用下,S元素加速腐蚀进程,腐蚀产物积累,加快腐蚀微裂纹的扩展,最终导致应力腐蚀断裂失效的发生。结论通过合理的选材、结构设计和防护工艺,严格控制原材料成分,降低应力水平和环境严苛度,使应力腐蚀出现概率大大减小。Objective To investigate the fracture reasons of 51CrV4 ring band. Methods The fracture modes and the fail-ure reasons of 51CrV4 ring band were analyzed by means of chemical composition analysis, mechanical performance analy-sis, SEM analysis, microstructure and energy dispersive spectrum analysis. Results In the tension stress state for a long time,the initiation cracks were formed at inner surface edge of the 51CrV4 ring band. At the same time, under the synergy of cor-rosive medium and stress, the corrosion process was accelerated by S, corrosion product was accumulated, and the expansionof corrosion microcracks was accelerated, the SCC failure was caused finally. Conclusion The occurrence probability ofSCC cracking could be greatly reduced by selecting material reasonably, improving the process design and protection tech-nology, controlling raw material composition and reducing stress level and environmental severity.

关 键 词：51CrV4 环箍 断裂 应力腐蚀 

分 类 号：TJ04[兵器科学与技术—兵器发射理论与技术]