热处理对吸铸TiAl基合金铸件组织的影响Effect of heat treatment on microstructure of TiAl based alloy casting by suction casting process
叶喜葱,苏彦庆,郭景杰,张丽红,郝志江
摘要(Abstract)：
利用金属型底浇式真空吸铸技术和添加合金元素获得TiAl基合金薄板,观察并研究薄板热处理前后的组织。结果表明,在金属型强制冷却和添加合金元素的共同作用下,利用金属型底浇式真空吸铸技术获得的TiAl基合金薄板件铸态组织细小、致密。其中Ti-47Al-5Nb-0.5Si和Ti-47Al-2W-0.5Si合金的铸态平均晶粒多在20μm左右,但是,铸态组织的片层组织不均匀,且在组织内部存在较大的偏析。将试样加热到1300℃,保温5 h,随炉冷却热处理后,TiAl基合金薄板的铸态组织有所长大,但是片层更加平整稳定,偏析也明显得到改善。
关键词(KeyWords)： TiAl基合金;底浇式;真空吸铸;微观组织;热处理
基金项目(Foundation): 三峡大学科研启动基金(0620100021)
作者(Author): 叶喜葱,苏彦庆,郭景杰,张丽红,郝志江
DOI: 10.13289/j.issn.1009-6264.2012.01.024
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