| 不同温度锻造的Ti2AlNb/TC11双合金焊接界面组织在热暴露时的变化 |
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| 引用本文： | 贾倩,姚泽坤,张东亚,秦春,涂唯坚,杨国宝,耿景东. 不同温度锻造的Ti2AlNb/TC11双合金焊接界面组织在热暴露时的变化[J]. 焊接学报, 2014, 35(11): 79-83 |
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| 作者姓名： | 贾倩 姚泽坤 张东亚 秦春 涂唯坚 杨国宝 耿景东 |
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| 作者单位： | 1.西北工业大学材料学院, 西安 710072;难变形材料锻造技术研究应用中心, 西安 710072 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 利用光学显微镜OM和透射电子显微镜TEM研究了Ti2AlNb/TC11双合金经近等温锻造、梯度热处理后以不同时间在550℃热暴露的显微组织变化.结果表明,热暴露期间,接头及Ti2AlNb基体组织有B2→O+β分解发生,α2相向B2晶界迁移,热暴露时间越长,α2相偏聚越严重,在热暴露100h时聚集成块状,同时随热暴露时间的延长,β相变得粗大,体积分数增加,当接头部位的铝、铌含量高时,α2相在晶界偏聚成块,同时原始O相与B2相分解而来的次生O相叠加而导致其粗化.
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| 关 键 词： | 双合金 近等温锻造 热暴露 组织 |
| 收稿时间： | 2013-05-06 |
Microstructure evolution after thermal exposure in weld interface of Ti2AlNb/TC11 dual alloy forged at different temperatures |
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| JIA Qian,YAO Zekun,ZHANG Dongy,QIN Chun,TU Weijian,YANG Guobao and GENG Jingdong. Microstructure evolution after thermal exposure in weld interface of Ti2AlNb/TC11 dual alloy forged at different temperatures[J]. Transactions of The China Welding Institution, 2014, 35(11): 79-83 |
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| Authors: | JIA Qian YAO Zekun ZHANG Dongy QIN Chun TU Weijian YANG Guobao GENG Jingdong |
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| Affiliation: | 1.College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China;ERC of Forging Technique for Less Deformable Materials, Xi'an 710072, China2.Blade Factory of Guizhou Aero-Power Company, Pingba 561114, China |
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| Abstract: | The microstructure evolution in Ti2 AlNb/TC11 dual alloys after near thermal forging, gradient heat treatment and thermal exposure at 550℃ for 50 h and 100 h, respectively, was investigated with optical microscope(OM) and transmission electron microscope(TEM). The results show that B2→O+β decomposition occurred in the welded seam and Ti2 AlNb matrix, and α2 phase migrated to the grain boundary of B2 during thermal exposure. The time for thermal exposure was longer, the segregation of α2 phase at grain boundary was severer. And α2 phase agglomerated into block when the thermal exposure time was 100 h. Also, the β phase grew coarse and its volume percentage increased simultaneously. If Al and Nb contents were large in the joint, α2 phase would agglomerate at grain boundary, the original O phase overprinting with the secondary O phase decomposed from B2 phase would coarsen. |
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| Keywords: | dual alloys near thermal forging thermal exposure microstructure |
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