The bolts in the tune door of a 660 MW ultra supercritical unit were broken after short-term service.These bolts were made of GH783 alloy,an anti-oxidized Ni low expansion superalloy.The fracture bolts were investigated by macroscopic examination,metallographic examination,SEM equipped energy spectrum analysis composition analysis and mechanical properties test.The results show that:in the bolt hot tightening process,three heating pipes were high temperature damaged and remained in the bolt holes which burn...
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