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针对某发动机试验区的液氧供应系统增压气体阀门肩圈工作过程出现的裂纹现象,为保证气体供应正常,确立裂纹出现的主要原因,避免试车安全隐患,首先从宏观观察,对表面型貌和断面进行观察,然后对肩圈进行理化分析,从基体上确定材料成分,结合裂纹源区断口腐蚀形貌进行金相组织检查,确定裂纹腐蚀特性;对裂纹腐蚀特性进行材料成分、加工工艺、硬度进行检测,分析肩圈材料力学性能分析,并结合能谱分析、铁素体测量、残余应力分析,确定裂纹腐蚀特性根源与因素,同时结合有限元的应力分析,分析应力腐蚀的主要原因和诱导因素,研究肩圈裂纹的内在机理;在此基础上,制定使用过程的防范措施,确保使用过程的肩圈性能。
In order to ensure the normal supply of gas and to establish the main cause of the crack, aiming at avoiding the potential safety hazard of test run, aiming at the cracking phenomenon of pressurized gas valve shoulder ring during the working process of liquid oxygen supply system in an engine test area, And cross-section observation, and then the shoulder ring physical and chemical analysis, from the matrix to determine the material composition, combined with the fracture surface corrosion fracture morphology of the metallographic examination to determine the characteristics of crack corrosion; crack corrosion characteristics of the material composition, processing technology, The mechanical properties of the material of the shoulder ring are analyzed. The causes and causes of crack corrosion are determined by the combination of energy spectrum analysis, ferrite measurement and residual stress analysis. At the same time, the stress analysis of the finite element method is used to analyze the main causes of stress corrosion Inducing factors to study the inner mechanism of the shoulder ring crack; on this basis, to develop preventive measures to use the process to ensure that the use of shoulder ring performance.