（Central Iron & Steel Research Institute, Beijing 100081, China）
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DOI:
10.7502/j.issn.1674-3962.2012.12.02
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Abstract:
As a result of higher high temperature strength, excellent rupture stress, creep and fatigue properties, as well as good processing and welding performance, GH4169 alloy has been widely used in aerospace, petrochemical and other fields. With continuous improvement on performance of aeronautical and astronautical engines, some higher requirements were put forward to the key material GH4169 Such as temperature bearing capability, rupture stress and creep properties as well as fatigue resistant performance were improved to meet the demands of high performance, high reliability and long service life of the advanced aeroengines. The achievement of basic research and development of industrial manufacture technologies were systematically expounded from aspects of alloy modification, optimization of melting process, improvement of hot deformation technology for the past fifty years in this paper. Expounded contents include: development of alloying principle of modified alloy with higher temperature bearing capability for improving the thermal stability; triple melting technology for the preparation of large sizd clean ingot without segregation, promotion of hot processing technology of press forging and radial forging combination for the preparation of fine grained bar; new progress of hot die forging and isothermal forging for the realization of near net forming.