镍基单晶高温合金杂晶形成倾向性的研究

金属学报, 2012, 48(10): 1229-1236. doi: 10.3724/SP.J.1037.2012.00261

镍基单晶高温合金杂晶形成倾向性的研究

张小丽 ^1, , 周亦胄 ^2, , 金涛 ^3, , 孙晓峰 ^4,

1.中国科学院金属研究所,沈阳,110016

2.中国科学院金属研究所,沈阳,110016

3.中国科学院金属研究所,沈阳,110016

4.中国科学院金属研究所,沈阳,110016

基金项目: 国家重点基础研究发展计划项目(2010CB631206) 国家自然科学基金(U1037601和50931004) 中国科学院"百人计划"项目

关键词：镍基高温合金 , 定向凝固 , 杂晶 , 过冷度

STUDY ON THE TENDENCY OF STRAY GRAIN FORMATION OF Ni-BASED SINGLE CRYSTAL SUPERALLOYS

采用2种不同平台尺寸的模型试样,对镍基单晶高温合金定向凝固过程中的杂晶形成倾向性进行量化研究,对不同合金的杂晶形成倾向性及杂晶在平台内的形成机制进行探索.结果表明,平台长度越长、高度越小时,杂晶越容易在平台内形核并长大；在第一、二、三代镍基单晶高温合金SRR99,DD5和DD90中,第一代合金的杂晶形成倾向性最弱,第二代次之,第三代最强；凝固时平台尖角处的过冷度大于平台内部的过冷度,且随着平台长度增加和平台高度减小,平台尖角处的过冷度增大,当平台尖角处的过冷度达到临界形核过冷度时,杂晶在平台尖角处形核并快速长大进入平台内部.

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镍基单晶高温合金杂晶形成倾向性的研究

STUDY ON THE TENDENCY OF STRAY GRAIN FORMATION OF Ni-BASED SINGLE CRYSTAL SUPERALLOYS

参考文献