Failure Analysis and Repair Development Engineering of Fractured Tip of Inconel 792 Turbine Wheel
The failure analysis has been performed on fractured blade of turbine wheel assembly of an Auxiliary Power Unit (APU). The turbine wheel is made of as-cast nickel-base superalloy Inconel 792. To support the analysis, laboratory practices including visual inspection, photography, stereomicroscopy, chemical composition testing, fractography, tribology, hardness testing, and metallography were conducted. Thermo-mechanical fatigue, overheating, hot corrosion, and creep are beyond the conclusion of the failure mode. The evidence shows that the fracture maybe initiated from fissures and macrocracks and then propagated to become an open-surface crack. It may come from hot cracking mechanism during previous weld repair. In addition to high content of Aluminum and Titanium in weld metal, the brittleness shown by the intergranular features compared to the transgranular cleavage facets indicate that the weldment ductility is low. Compared to unfailed blade, grain size of the failed blade is markedly different showing exposition to heat either from welding thermal cycle or abnormal operating environment at elevated temperature. Further repair scheme is developed based on successful PQTR (Procedure Qualification Test Record) from microhardness, nondestructive, and destructive testing. Thus, GTA Welding followed by Solution and Aging Treatment is chosen.
aerospace weld repair fractography metallography superalloy failure analysis
Arif Sugianto Iqbal F.Dasril Dede S.Nurbaeti M.Andito B.Ramadian
Dept of Aircraft Engineering,Engineering Services,GMFAeroAsia,Jakarta 19130,Indonesia Dept of Turbine Part Repair,Engine Maintenance,GMF AeroAsia,Jakarta 19130,Indonesia
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
281-287
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）