| 铸造Ti-45Al-8.5Nb-0.5(W,B,Y)合金组织均匀化处理 |
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| 引用本文： | 路新,朱郎平,刘程程,赵腾飞,章林,吴茂,曲选辉.铸造Ti-45Al-8.5Nb-0.5(W,B,Y)合金组织均匀化处理[J].金属热处理,2012(5):61-64. |
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| 作者姓名： | 路新 朱郎平 刘程程 赵腾飞 章林 吴茂 曲选辉 |
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| 作者单位： | 北京科技大学新材料技术研究院 |
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| 基金项目： | 国家自然科学基金(50974017) |
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| 摘 要： | 采用水冷铜坩埚感应熔炼制备了Ti-45Al-8.5Nb-0.5(W,B,Y)(at%)合金铸锭,研究了铸造合金组织特点及均匀化处理温度对显微组织的影响规律。结果表明,铸锭组织呈全层片,有大量β相网,富Al相等成分偏析;调整热处理温度使合金偏析区域处于α单相区,充分保温后缓慢冷却可消除偏析形成全层片组织;经过1420℃×12 h炉冷,β相与富Al相偏析均得以消除,获得平均尺寸约为320μm,层片间距约为0.8μm的均匀全层片组织。
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| 关 键 词： | 高铌TiAl合金 均匀化处理 显微组织 偏析 |
Homogenization of as-cast Ti-45Al-8.5Nb-0.5(W,B,Y)alloy |
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| LU Xin,ZHU Langping,LIU Chengcheng,ZHAO Tengfei,ZHANG Lin,WU Mao,QU Xuanhui.Homogenization of as-cast Ti-45Al-8.5Nb-0.5(W,B,Y)alloy[J].Heat Treatment of Metals,2012(5):61-64. |
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| Authors: | LU Xin ZHU Langping LIU Chengcheng ZHAO Tengfei ZHANG Lin WU Mao QU Xuanhui |
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| Affiliation: | (Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,10083,China) |
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| Abstract: | Ti-45Al-8.5Nb-0.5(W,B,Y)(at%) ingot was prepared using an induction furnace with a water-cooled copper crucible.The microstructure of the ingot and the effect of the homogenizing temperature on the microstructure were studied.The results show that the ingot exhibits full lamellar microstructure with a large amount of network β phase and Al-rich phase segregations.The segregations can be efficiently eliminated through heat treatment at the α phase region of the segregation area,and after fully holding then slowly cooling down,the uniform fully lamellar microstructure can be obtained.Heat treated at 1420 ℃ for 12 h with furnace cooling,the alloy exhibits full lamellar microstructure without β phase and Al-rich phase,and the average grain size and lamellar spacing are 320 μm and 0.8 μm,respectively. |
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| Keywords: | high Nb containing TiAl alloys homogenization microstructure segregation |
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