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.
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