| B、Y及冷却速度对Ti-47Al-2Cr-2Nb合金组织的细化作用 |
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| 引用本文： | 王建吉,杨莉莉,郑立静,闫洁,肖志霞,李国强,张虎.B、Y及冷却速度对Ti-47Al-2Cr-2Nb合金组织的细化作用[J].特种铸造及有色合金,2011,31(3):260-263,193,194. |
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| 作者姓名： | 王建吉 杨莉莉 郑立静 闫洁 肖志霞 李国强 张虎 |
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| 作者单位： | 1. 北京航空航天大学材料科学与工程学院
2. 中国浦发机械工业股份有限公司经营管理部 |
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| 摘 要： | 研究了微量元素B、Y和冷却速度对Ti-47Al-2Cr-2Nb合金组织的复合细化效果。结果表明,在水冷铜坩埚磁悬浮真空感应熔炼和Y2O3型壳精密铸造条件下,B元素能够有效细化Ti-47Al-2Cr-2Nb铸件的晶粒尺寸,使其由粗大的柱状晶变为细小的等轴晶组织,但没有起到细化片层间距的明显作用。B、Y复合细化可以在B元素细化效果的基础上进一步细化片层团尺寸,同时显著细化片层间距。在壁厚为2～20mm范围内,Ti-47Al-2Cr-2Nb-0.8B-0.3Y铸件的宏观组织均为等轴晶;且随着厚度的增加,等轴晶尺寸逐渐增大。适当降低型壳预热温度也有助于获得细小的片层组织。
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| 关 键 词： | TiAl合金 晶粒尺寸 B元素 Y元素 冷却速度 |
Effects of minor B,Y and Cooling Rate on the Microstructure Refinement of Ti-47Al-2Cr-2Nb Alloy |
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| Wang Jianji,Yang Lili,Zheng Lijing,Yan Jie,Xiao Zhixia,Li Guoqiang,Zhang Hu.Effects of minor B,Y and Cooling Rate on the Microstructure Refinement of Ti-47Al-2Cr-2Nb Alloy[J].Special Casting & Nonferrous Alloys,2011,31(3):260-263,193,194. |
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| Authors: | Wang Jianji Yang Lili Zheng Lijing Yan Jie Xiao Zhixia Li Guoqiang Zhang Hu |
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| Affiliation: | Wang Jianji1,Yang Lili1,Zheng Lijing1,Yan Jie1,Xiao Zhixia1,Li Guoqiang2,Zhang Hu1 (1. School of Materials Science and Engineering,Beihang University,Beijing,China,2. Business and Managing Office of China Perfect Machinery Industry Co.,Ltd.,Shanghai,China) |
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| Abstract: | Effects of minor B and Y as well as cooling rate on compound refinement of microstructure of Ti+47Al-2Cr-2Nb alloy were investigated. The results show that in the condition of smelting with the water-cooled copper crucible vacuum induction skull furnace and investment casting with Y2O3 shell mold, grain size of Ti-47Al-2Cr-2Nb castings is greatly refined with B addition, where coarse columnar grain is converted into fine equaixed one, however, refining effects on lamellar spacing are absent. B and Y compoun... |
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| Keywords: | TiAl Alloy Grain Size B Y Cooling Rate |
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