(1. 沈陽工業(yè)大學 材料科學與工程學院，沈陽 110870；
2. 中國科學院 金屬研究所，沈陽 110015)
摘 要: 對等溫鍛造GH4169G合金進行不同條件熱處理和蠕變性能測試，研究熱處理制度對合金組織與蠕變性能的影響。結果表明：經直接時效和標準熱處理后，ITF-GH4169G合金中的δ相具有粒狀或針狀形態(tài)，其中，標準熱處理期間合金中元素Fe和Cr富集于近晶界區(qū)域。與標準熱處理合金相比，直接時效態(tài)合金在蠕變期間晶內發(fā)生位錯的單取向或雙取向滑移，可減緩應力集中、延遲裂紋的萌生與擴展。而標準熱處理態(tài)合金中形成的針狀δ相可削弱晶界的結合強度，并促使晶界處發(fā)生裂紋的萌生與擴展。
關鍵字: GH4169G合金；熱處理制度；微觀組織；針狀δ相；蠕變
（1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:By means of heat treatment and creep property measurement under different conditions, the influence of the heat treatment regimes on the microstructure and creep properties of GH4169 alloy was investigated. The results show that, after direct aging or standard heat treatment, the particle-like or needle-like δ phase precipitates in the isothermal forged (ITF) GH4169G alloy, thereinto, the elements Cr, Fe are enriched in the boundaries regions due to the recrystallization during the standard heat treatment. Compared with the standard heat-treated alloy, significant amount of dislocations slipping with single oriented and double oriented feature are activated in ITF-DA-GH4169 alloy during the creep, which may retard the stress concentration to delay the initiation and propagation of the cracks. The needle-like δ phase precipitated in the standard heat treated alloy may weaken the combination strength between the boundaries, and promote the initiation and propagation of the cracks along the boundaries during creep.
Key words: GH4169G alloy; heat treatment regimes; microstructure; needle-like δ phase; creep
