邵斌,单德彬,郭斌,宗影影.0.2%氢促进Ti-22Al-25Nb合金O相转变[J].稀有金属材料与工程,2019,48(4):1174~1178.[Shao Bin,Shan Debin,Guo Bin,Zong Yingying.0.2%H facilitating the phase transformation of the Ti-22Al-25Nb[J].Rare Metal Materials and Engineering,2019,48(4):1174~1178.]
0.2%氢促进Ti-22Al-25Nb合金O相转变
投稿时间:2017-09-30  修订日期:2017-12-17
中文关键词:  Ti-22Al-25Nb合金  氢致相变  晶粒细化  O相
基金项目:国家自然科学基金资助(项目号No. 51275132)
中文摘要:
      Ti-22Al-25Nb合金是一种新型的Ti2AlNb合金,但是其热加工温度高,变形抗力大一直是限制合金应用的重要瓶颈。热氢工艺作为一种有效的降低钛合金变形抗力的方法,近年来也被应用于Ti2AlNb合金。本文发现在添加0.2wt.%氢后Ti-22Al-25Nb合金的热处理过程中,相变过程加快,相变点降低。并且氢促进B2相再结晶过程,960℃晶粒尺寸从135μm细化到60μm。在升温过程中氢促进强化相O相分解为B2相,并促进α2相从颗粒状转变为条状。在750℃保温时氢促进O相在晶界处优先析出并迅速长大,氢加快了B2→O相的转变过程。
0.2%H facilitating the phase transformation of the Ti-22Al-25Nb
英文关键词:Ti-22Al-25Nb alloy  hydrogen-induced phase transition  grain refinement  O phase
英文摘要:
      Ti-22Al-25Nb alloy is a new type of Ti2AlNb alloy. Its high hot-processing temperature and large deformation resistance are always significant limitations for its wide application. Hot-hydrogen technics, as an efficient method to reduce the deformation resistance of Titanium alloys, is applied to the Ti2AlNb alloy in recent years. This paper reveals that the phase transformation process accelerates and the phase transformation point declines during the hot treatment process of the Ti-22Al-25Nb alloy after a 0.2wt.% hydrogen addition. Hydrogen facilitates the recrystallization process and the grain size refines from 135μm to 60μm at 960℃. Hydrogen facilitates the decomposition of strengthening phase O phase into B2 phase and the transformation of the α2 phase from granular shape to trip shape during the temperature increasing process. Hydrogen promotes the preferential segregation and fast growth of the O phase at grain boundaries and accelerates the transformation process of B2→O phase during the 750℃ heat preservation process.
作者单位E-mail
邵斌 哈尔滨工业大学 heloshao@126.com 
单德彬 哈尔滨工业大学  
郭斌 哈尔滨工业大学  
宗影影 哈尔滨工业大学 hagongda@hit.edu.cn 
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