Transactions of Materials and Heat Treatment

Title：Study on influencing factors of rupture life for superalloy GH4169D forgings

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ClassificationCode：TB31

year,vol(issue):pagenumber：2023,48(1):46-53

Abstract：

The high-temperature stress rupture life and microstructure of superalloy GH4169D front diffuser forgings of aero-engine were mainly evaluated, and the influencing factors for the stress rupture life of superalloy GH4169D forgings were studied by analyzing the mechanical properties and microstructure of forgings body and test ring. The results show that grain structure, heat treatment system and precipitated phases of forgings are all the influencing factors, and the content of precipitated phase η is the main influencing factor. Excessive precipitation η phase in forgings leads to insufficient precipitation of strengthened γ′ phase, which reduces the stress rupture life of forgings. However, the precipitation of η phase can be inhibited to some extent by increasing the temperature of solution heat treatment and the cooling rate of solution, so as to improve the stress rupture life of forgings. In addition, during the forging process, the grain structure of forgings should be as uniform as possible to avoid the appearance of mixed grain structure, otherwise it is easy to lead to unqualified stress rupture life of forgings.

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作者简介: 王妙全(1982-), 男, 硕士, 高级工程师 E-mail: miaoquanw@ 126. com

Reference：

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