| 凝固方向对单晶高温合金枝晶组织的影响 |
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| 引用本文： | 张龙飞,燕平,赵京晨,曾强,韩凤奎.凝固方向对单晶高温合金枝晶组织的影响[J].材料工程,2011(6):67-71,76. |
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| 作者姓名： | 张龙飞 燕平 赵京晨 曾强 韩凤奎 |
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| 作者单位： | 钢铁研究总院; |
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| 摘 要： | 用籽晶法制备了沿不同晶体取向凝同的镍基单晶高温合金试样,研究了单晶中枝晶形貌和一次枝晶臂距随凝固取向的变化规律.结果表明:凝同方向偏离001]取向小于15°时,枝晶排列比较规则,一次枝晶臂距随偏离角度增大而减小;偏离角度为25°时,部分二次枝晶臂阻断了相邻一次枝晶干的生长,导致一次枝晶臂距增大.沿011]和111...
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| 关 键 词： | 镍基单晶高温合金 凝固方向 枝晶形态 一次枝晶臂距 |
Influence of the Solidification Directions on Dendritic Structures in a Single Crystal Superalloy |
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| ZHANG Long-fei,YAN Ping,ZHAO Jing-chen,ZENG Qiang,HAN Feng-kui.Influence of the Solidification Directions on Dendritic Structures in a Single Crystal Superalloy[J].Journal of Materials Engineering,2011(6):67-71,76. |
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| Authors: | ZHANG Long-fei YAN Ping ZHAO Jing-chen ZENG Qiang HAN Feng-kui |
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| Affiliation: | ZHANG Long-fei,YAN Ping,ZHAO Jing-chen,ZENG Qiang,HAN Feng-kui(Central Iron and Steel Research Institute,Beijing 100081,China) |
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| Abstract: | In order to investigate the effect of solidification direction on dendritic morphology and primary dendritic arm spacing(PDAS) in Ni-based single crystal superalloy,seeding technique was applied to obtain the single crystal samples solidified in different orientations.The results indicated that when the deviation degrees from solidification direction to orientation were within 15°,dendrite morphology kept regular and primary dendritic arm spacing declined with deviation degrees increasing;excessively long secondary dendritic arms blocked the growth of vicinal primary dendritic arm when deviation degrees were up to 25°,leading to increase in PDAS.Owing to 2 and 3 dendritic arms orientated in preferential growth direction in crystals solidified in and orientation respectively,complex dendritic configurations are formed. |
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| Keywords: | Ni-based single crystal superalloy solidification direction dendritic morphology primary dendritic arm spacing |
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