熱處理制度對(duì)GH4169G合金微觀組織與蠕變性能的影響Influence of heat treatment regimes on microstructure and creep properties of GH4169G alloy

對(duì)等溫鍛造GH4169G合金進(jìn)行不同條件熱處理和蠕變性能測(cè)試，研究熱處理制度對(duì)合金組織與蠕變性能的影響。結(jié)果表明：經(jīng)直接時(shí)效和標(biāo)準(zhǔn)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(biāo)準(zhǔn)熱處理期間合金中元素Fe和Cr富集于近晶界區(qū)域。與標(biāo)準(zhǔn)熱處理合金相比，直接時(shí)效態(tài)合金在蠕變期間晶內(nèi)發(fā)生位錯(cuò)的單取向或雙取向滑移，可減緩應(yīng)力集中、延遲裂紋的萌生與擴(kuò)展。而標(biāo)準(zhǔn)熱處理態(tài)合金中形成的針狀δ相可削弱晶界的結(jié)合強(qiáng)度，并促使晶界處發(fā)生裂紋的萌生與擴(kuò)展。

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.

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