为了对不同Cr含量高温合金中α-Cr相析出行为进行对比研究,优化高Cr合金中α-Cr相的组织形态,通过微观分析手段对不同Cr含量的GH169， GH625， GH648及两种高Cr实验合金进行α-Cr相析出行为的对比分析, 同时通过特殊热处理对高Cr合金α-Cr相组织优化进行了初步研究. 结果表明, Cr含量低于25%的GH169和GH625合金在标准热处理后均没有α-Cr相析出,但经过长期时效后α-Cr相依附于δ相和M6C的界面析出；而Cr含量大于30%的GH648合金以及更高Cr含量的两种实验合金, α-Cr相已直接从奥氏体基体中析出,并有不同的析出存在形态, 随Cr含量增加, α-Cr相从短棒状和颗粒状向长片条状和层片状的析出方式变化.同时, 通过特殊热处理优化α-Cr相组织分布形态, 获得细小弥散分布的α-Cr相, 为高Cr合金的发展奠定研究基础.
Theα-Cr precipitation behavior and its effects on the different Cr-containing superalloys, such as GH169, GH625, GH648 and two high-Cr tested alloys, were investigated by microstructure analysis approach in order to compare their behavior and optimize theα-Cr phase morphology. The results show that noα-Cr phase was observed after a standard heat treatment but with long-term aging theα-Cr phase precipitates and grows usually clinging to δ phase in GH169 alloy and clinging to M6C carbide andδphase in GH625 alloy. However, for high Cr-containing alloys (Cr>30%, GH648 and two tested alloys), the α-Cr phase with various morphologies precipitates directly from austenitic matrix and from short-plate to long acicular and lamellar shape. Furthermore, the optimization of α-Cr phase was initially studied by a special heat treatment in order to obtain fine and uniform α-Cr particles.
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