热处理制度对GH4169G合金微观组织与蠕变性能的影响Influence of heat treatment regimes on microstructure and creep properties of GH4169G alloy

对等温锻造GH4169G合金进行不同条件热处理和蠕变性能测试，研究热处理制度对合金组织与蠕变性能的影响。结果表明：经直接时效和标准热处理后，ITF-GH4169G合金中的δ相具有粒状或针状形态，其中，标准热处理期间合金中元素Fe和Cr富集于近晶界区域。与标准热处理合金相比，直接时效态合金在蠕变期间晶内发生位错的单取向或双取向滑移，可减缓应力集中、延迟裂纹的萌生与扩展。而标准热处理态合金中形成的针状δ相可削弱晶界的结合强度，并促使晶界处发生裂纹的萌生与扩展。

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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