|
|
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ELECTRON BEAM WELDMENT OF TITANIUM ALLOY TC17 |
Bingbing YU1,Zhiyong CHEN1(),Zibo ZHAO1,Jianrong LIU1,Qingjiang WANG1,Jinwei LI2 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. 2 Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China. |
|
Cite this article:
Bingbing YU,Zhiyong CHEN,Zibo ZHAO,Jianrong LIU,Qingjiang WANG,Jinwei LI. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ELECTRON BEAM WELDMENT OF TITANIUM ALLOY TC17. Acta Metall Sin, 2016, 52(7): 831-841.
|
Abstract Most titanium alloys have been designed for aeronautical applications, where their excellent specific properties are fully employed and weldability is a classic problem with Ti and its alloys. Microstructure and mechanical properties of the electron beam weldments of TC17 alloy were investigated in this work. The results showed that there exhibited three zones across the TC17 electron beam weldment: the fusion zone (FZ), heat affected zone (HAZ) and base metal (BM). It was also observed that the as-welded FZ consisted of metastable β columnar grains, while the HAZ consisted of acicular α/α′ phase, equiaxed α phase and metastable β phase. Furthermore, it was indicated that the transformation from metastable β phase to α+β phase happened when the FZ and HAZ were post-weld heat treated at 630~800 ℃, the coarsening of α laths and the grain boundary α were also observed when the heat treatment temperature increased. The increasing of 450 ℃ ultimate tensile strength of FZ was ascribed to the precipitation of secondary acicular α platelets during tensile testing in the as-welded and 800 ℃ heat treated conditions, which led to the low yield ratio of FZ. The tensile failure location of the weldments was found to occur in preference in the low tensile yield strength area, or in the low hardness area when the difference between yield strength across the weldments is very small. It was concluded that the optimal post-weld heat treatment for the TC17 alloy weldment was 630 ℃, 2 h, A.C., at which the weldments showed good combination of tensile strength and elongation.
|
Received: 20 November 2015
|
[1] | Leyens C, Peters M, translated by Chen Z H. Titanium and Titanium Alloys. Beijing: Chemical Industry Press, 2005: 297 | [1] | (Leyens C, Peters M著, 陈振华译. 钛与钛合金. 北京: 化学工业出版社, 2005: 297) | [2] | Lütjering G, Willams J C, translated by Lei T, Yang X Y, Fang S M. Titanium. 2nd Ed., Beijing: Metallurgical Industry Press, 2011: 8 | [2] | (Lütjering G, Willams J C著, 雷霆, 杨晓源, 方树铭译. 钛. 第二版, 北京: 冶金工业出版社, 2011: 8) | [3] | Kou S, translated by Yan J C, Yang J G, Zhang G J. Welding Metallurgy. 2nd Ed., Beijing: Higher Education Press, 2012: 27 | [3] | (Kou S著, 阎久春, 杨建国, 张广军译. 焊接冶金学. 第二版, 北京: 高等教育出版社, 2012: 27) | [4] | Qi Y L, Deng J, Hong Q, Zeng L Y.Mater Sci Eng, 2000; A280: 177 | [5] | Wang T, Guo H Z, Tan L J, Yao Z K, Zhao Y, Liu P H.Mater Sci Eng, 2011; A528: 6375 | [6] | Appolaire B, Da Costa Teixeira J, Aeby-Gautier E, Denis S, Cailletaud G, Spath N.Mater Sci Eng, 2007; A448: 135 | [7] | Wang J Y, Ge Z M, Zhou Y B.Titanium Alloy for Aerospace. Shanghai: Shanghai Science and Technology Press, 1985: 182 | [7] | (王金友, 葛志明, 周彦邦. 航空用钛合金. 上海: 上海科学技术出版社, 1985: 182) | [8] | Lu W, Li X Y, Lei Y P, Shi Y W.Mater Sci Eng, 2012; A540: 135 | [9] | Pederson R, Niklasson F, Skystedt F, Warren R.Mater Sci Eng, 2012; A552: 555 | [10] | Prasad Rao K, Angamuthu K, Bala Srinivasan P.J Mater Process Technol, 2008; 199: 185 | [11] | Zhou L, Liu H J, Liu P, Liu Q W.Scr Mater, 2009; 61: 596 | [12] | Chen Z Y, Wang Q J, Liu J R, Li Y L, Yang R, Li J W, Liu F J.Acta Metall Sin, 2008; 44: 263 | [12] | (陈志勇, 王清江, 刘建荣, 李玉兰, 杨锐, 李晋炜, 刘方军. 金属学报, 2008; 44: 263) | [13] | Chen Z Y, Li J W, Liu J, Wang Q J, Liu J R, Yang R.J Mater Sci Technol, 2010; 26: 564 | [14] | Ji Y, Wu S, Yu G.Fatigue Fract Eng Mater Struct, 2013; 37: 39 | [15] | Ma T J, Li W Y, Zhong B, Zhang Y, Li J L. Sci Technol Weld Joining, 2012; 17: 180 | [16] | Li W Y, Ma T J, Yang S Q.Adv Eng Mater, 2010; 12: 35 | [17] | Wang S Q, Liu J H, Chen D L.Mater Sci Eng, 2013; A584: 47 | [18] | Wang S Q, Liu J H, Chen D L.Mater Des, 2013; 49: 716 | [19] | Gogia A K.Def Sci J, 2005; 55(2): 147 | [20] | Chen Z Y.PhD Dissertation, Institute of Metal Research, Chinese Academy of Science, Shenyang, 2008 | [20] | (陈志勇. 中国科学院金属研究所博士学位论文, 沈阳, 2008) | [21] | Sabol J C, Pasang T, Misiniolek W Z, Willams J C.J Mater Process Technol, 2012; 212: 2380 | [22] | Tang X, Ahmed T, Rack H J.J Mater Sci, 2000; 35: 1805 | [23] | Najdahmadi A, Zarei-Hanzaki A, Farghadani E.Mater Des, 2014; 54: 786 | [24] | Sakaguch N, Niinomi M, Akahori T.Mater Trans, 2004; 45: 1113 | [25] | Hao Y L, Niinomi M, Kuroda D, Fukunaga K, Zhou Y L, Yang R, Suzuki A.Metall Mater Trans, 2002; 33A: 3137 | [26] | Hao Y L, Yang R, Li S J, Cui Y Y, Li D.Acta Metall Sin, 2002; 38(z1): 236 | [26] | (郝玉琳, 杨锐, 李述军, 崔玉友, 李东. 金属学报, 2002; 38(z1): 236) |
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|