GH4169D高温合金锻件持久寿命的影响因素研究  

Study on influencing factors of rupture life for superalloy GH4169D forgings

作　　者：王妙全 田成刚 徐瑶 南洋 袁文玲 Wang Miaoquan;Tian Chenggang;Xu Yao;Nan Yang;Yuan Wenling(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 201108,China)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海201108

出　　处：《锻压技术》2023年第1期46-52,共7页Forging & Stamping Technology

摘　　要：对航空发动机GH4169D高温合金前置扩压器锻件的高温持久寿命和显微组织进行了评定,通过分析锻件本体和试环的力学性能与显微组织,研究了GH4169D高温合金锻件持久寿命的影响因素。结果表明,锻件的晶粒组织、热处理制度及析出相均为影响因素,且析出相η相的含量为主要影响因素,锻件中析出过多的η相会导致强化相γ′相析出不足,从而降低锻件的持久寿命。提高固溶热处理温度和固溶冷却速度,可在一定程度上抑制η相的析出,从而提高锻件的持久寿命。此外,锻造过程中应尽可能保证锻件晶粒组织均匀,避免出现混晶组织,否则也易导致锻件持久寿命不合格。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.

关 键 词：GH4169D高温合金 前置扩压器锻件 持久寿命 显微组织 Η相 

分 类 号：TB31[一般工业技术—材料科学与工程]