| 一种柱状晶辅助选晶制备镍基单晶高温合金的方法 |
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| 引用本文： | 杨振宇,陈昊,曹金华,郑素杰,骆凯伦,骆宇时,戴圣龙. 一种柱状晶辅助选晶制备镍基单晶高温合金的方法[J]. 失效分析与预防, 2021, 16(3): 173-176. DOI: 10.3969/j.issn.1673-6214.2021.03.004 |
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| 作者姓名： | 杨振宇 陈昊 曹金华 郑素杰 骆凯伦 骆宇时 戴圣龙 |
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| 作者单位： | 中国航发北京航空材料研究院 先进高温结构材料重点实验室,北京 100095;空军装备部驻北京地区第六军事代表室,北京 101300;陆军装备部驻哈尔滨地区航空军事代表室,哈尔滨 150001 |
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| 摘 要： | 提出了一种采用柱状晶辅助选晶的制备镍基单晶高温合金的方法。采用金相显微镜和电子背散射衍射（EBSD）等方法表征了单晶制备过程中显微组织及晶体取向。结果表明:柱状晶部分熔化，柱状晶边缘回熔界面附近形成大量杂晶，但只有<001>方向偏离定向凝固方向较小的晶粒能够长大。采用柱状晶选晶的方法能够在螺旋选晶器出口处获得<001>方向偏离定向凝固方向小于8°的单晶铸件。
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| 关 键 词： | 镍基单晶高温合金 定向凝固 选晶 柱状晶 单晶取向 |
| 收稿时间： | 2021-03-23 |
A Novel Grain Selection Method Assisted by Columnar Grains for Ni-based Single Crystal Superalloy |
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| YANG Zhen-yu,CHEN Hao,CAO Jin-hua,ZHENG Su-jie,LUO Kai-lun,LUO Yu-shi,DAI Sheng-long. A Novel Grain Selection Method Assisted by Columnar Grains for Ni-based Single Crystal Superalloy[J]. Failure Analysis and Prevention, 2021, 16(3): 173-176. DOI: 10.3969/j.issn.1673-6214.2021.03.004 |
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| Authors: | YANG Zhen-yu CHEN Hao CAO Jin-hua ZHENG Su-jie LUO Kai-lun LUO Yu-shi DAI Sheng-long |
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| Abstract: | A novel grain selection method assisted by columnar grains for controlling the orientation of Ni-based single crystal was proposed in this paper. The microstructure and crystal orientation were characterized by metallographic microscope and electron backscatter diffraction (EBSD). The columnar grains partially melted, and a large number of stray grains formed near the melt back region. Only the epitaxial growth grains along the un-melted columnar grains grew up in the process of competitive growth. The <001> direction of grain selected by this method limited within 8 degree deviating from directional solidification. |
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