高炉煤气能量回收透平叶片失效的原因  

Failure Reason of the Blade of Top Gas Energy Recovery Turbine

作　　者：刘明霞 畅庚榕 付福兴 何斌锋 马飞[2] 陈明珂 余历军 戴君 徐可为 

机构地区：[1]西安文理学院机械与材料工程学院陕西省表面工程与再制造重点实验室,西安710065 [2]西安交通大学材料学院金属材料强度国家重点实验室,西安710049

出　　处：《机械工程材料》2018年第1期89-94,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51471130;51771144);陕西省自然科学基金资助项目(2013JM6002;14JK2122);陕西省科技统筹创新工程计划项目(2016KTCQ01-80);陕西省教育厅专项科研计划项目(16JK2198);西安市科技计划资助项目(2016CXWL27;CXY1531WL23;2016CXWL29)

摘　　要：某湿式高炉煤气能量回收透平(TRT)机组运行3a后,发现其一级和二级动叶片叶根出现裂纹,通过宏观形貌观察、化学成分分析、拉伸性能测试、微观形貌观察等对叶片进行了失效分析,探讨了裂纹产生的原因。结果表明:叶片上的裂纹属于典型的腐蚀疲劳开裂,裂纹位于叶根第一榫齿中间部位;裂纹在叶根与主轴榫槽的接触面所产生的腐蚀坑处萌生,在复杂交变应力的作用下,裂纹进一步扩展,最终导致机组的异常振动和停机。Cracks were found in the first and second stage rotor blade root section of a wet-typed top gas energy recovery turbine（TRT）after operation for 3 a.In order to investigate the cause for cracks,the failure analysis of the blade was performed by macroscopic morphology observation,chemical composition analysis,tensile property test and microscopic morphology observation.The results show that the blade failure was a typical corrosion fatigue damage.The cracks were located in the middle of the first tenon of the blade root.The cracks were initiated from corrosion pits on the contact surface of blade root and shaft groove.Under the effect of complex alternating stress,cracks propagated further,which eventually led to the abnormal vibration and the shut-down of the TRT.

关 键 词：高炉煤气能量回收透平 叶片 裂纹 腐蚀疲劳 交变应力 

分 类 号：TG146.1[一般工业技术—材料科学与工程]