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压缩机进口处金属软管在正常运行条件下发生爆裂失效,利用光学显微镜、扫描电子显微镜、EDS分析等方法对爆裂软管不同区域进行微观组织、裂纹形貌以及腐蚀产物进行分析。结果表明,金属软管化学成分满足牌号要求,组织为正常的奥氏体+少量析出相。波纹管底部存在环向裂纹,裂纹起裂于内壁面,以穿晶方式向外壁面扩展。环向微观断口呈解理台阶特征,纵向微观断口呈韧窝塑性破坏特征,断口处腐蚀产物含有较多的C、O和Fe元素,以及少量的S、Cl、Ca等元素。波纹金属软管的失效是因为波纹管内壁波谷处率先发生了氯化物应力腐蚀开裂,纵向裂纹为环向裂纹扩展失稳后产生的。
The metal hose at the inlet of the compressor burst under normal operating conditions, and the microstructure, crack morphology and corrosion products in different regions of the burst hose were analyzed by optical microscope, scanning electron microscope and EDS analysis. The results show that the chemical composition of the metal hose to meet the grade requirements, the organization of normal austenite + a small amount of precipitation phase. Bellows ring at the bottom of the existence of cracks, crack initiation in the inner wall surface, to the outer wall of the transgranular expansion. The circumferential microscopic fracture is characterized by cleavage steps. The longitudinal microscopic fracture is characterized by ductile plastic failure. The corrosion products at the fracture surface contain more C, O and Fe elements and a small amount of S, Cl, Ca and other elements. Corrugated metal hose failure is due to corrugated pipe wall at the first chloride stress corrosion cracking occurs, the longitudinal cracks ring instability propagation instability generated.