| 含铌高温合金液相中铌偏聚行为 |
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| 引用本文： | 董建新,张麦仓,曾燕屏. 含铌高温合金液相中铌偏聚行为[J]. 北京科技大学学报, 2005, 27(2): 197-201 |
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| 作者姓名： | 董建新 张麦仓 曾燕屏 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 摘 要： | 利用热力学相计算方法并结合相应的Ni基数据库对含Nb高温合金液相中Nb偏析规律进行系统的计算分析,计算结果与文献报道的测试结果相符性较好.计算结果表明,液相中Nb偏聚度和最大偏聚量随合金中Nb含量的增加并非单调的增加,而是先增加到一定值后再趋于下降或不变.Nb偏聚度与液固相间的温度差却有单调增加的关系,在此规律的理论指导下,提出了减小Nb偏析的合金设计思路并进行了对比分析.
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| 关 键 词： | 高温合金 GH4169 GH706 热力学计算 偏析 含铌 高温合金 液相 偏聚行为 superalloys liquid phase behavior segregation 计算分析 设计思路 指导 理论 关系 单调增加 温度差 液固相 定值 非单调 含量 相符性 |
| 修稿时间： | 2004-04-30 |
Calculation of Nb segregation behavior in liquid phase for Nb-rich superalloys |
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| Dong Jianxin,Zhang Maicang,ZENG Yanping. Calculation of Nb segregation behavior in liquid phase for Nb-rich superalloys[J]. Journal of University of Science and Technology Beijing, 2005, 27(2): 197-201 |
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| Authors: | Dong Jianxin Zhang Maicang ZENG Yanping |
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| Abstract: | The Nb segregation regulation and behavior in liquid phase were calculated using a thermodynamic calculation method and corresponding Ni-base database for two Nb-rich superalloys. The calculated results are agreeable with experimental values from references. Based on this model, the Nb segregation degree and the maximum Nb segregation content in liquid-solid temperature range do not linearly increase with increasing Nb content, but rising to the maximum then droping. However, the Nb segregation degree monotonously increases with increasing liquid-solid temperature range. According to this theoretic calculation, a method for alloy design was discussed in term of reducing Nb segregation and enlarging ingots. |
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| Keywords: | superalloy GH4169 GH706 thermal-dynamic calculation segregation |
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