Fracture Analysis of Connection Bolts of Aero-engine
Fracture Analysis of Connection Bolts of Aero-engine
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发表时间：
2012
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通讯作者：
Li Peng
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作者：
Li Peng
某燃气涡轮机的多个连接螺栓在使用一段时间后发生断裂，通过断口观察、显微组织检验、能谱分析和模拟试验等方法对断裂原因进行了分析。结果表明，断裂方式为沿晶脆性断裂，在拉应力和温度作用下，装配过程中使用的润滑脂中所含的低熔点元素Pb造成了沿晶腐蚀损伤，这对螺栓的失效分析和预防具有重要意义。
Several connection bolts used in gas turbine were found to have fractured after service for a while.The fracture cause was analyzed by facture surface observation,microstructure examination,energy spectrum analysis and analog experiment.The results indicate that the fracture mode is intergranular brittle fracture.Under tensile stress and temperature effect,the low-melting element Pb included in grease used during assembly process caused the intergranular corrosion damage,which is the main reason for the bolt fracture.The results are significant to failure analysis and prevention of the bolts.