MICROSTRUCTURE EVOLUTION OF Ti44Al6Nb ALLOY DIRECTIONALLY SOLIDIFIED WITH COLD CRUCIBLE

CHEN Ruirun; WANG Jichao; MA Tengfei; GUO Jingjie; DING Hongsheng; SU Yanqing; FU Hengzhi

doi:10.3724/SP.J.1037.2013.00550

Acta Metall Sin >

2013 , Vol. 49 >Issue 11: 1356 - 1362

DOI: https://doi.org/10.3724/SP.J.1037.2013.00550

MICROSTRUCTURE EVOLUTION OF Ti44Al6Nb ALLOY DIRECTIONALLY SOLIDIFIED WITH COLD CRUCIBLE

CHEN Ruirun ,
WANG Jichao ,
MA Tengfei ,
GUO Jingjie ,
DING Hongsheng ,
SU Yanqing ,
FU Hengzhi

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1) School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001
2) Tianjin Repair Technology Research Institute, CSIC, Tianjin 300456

Received date: 2013-09-04

Revised date: 2013-09-24

Online published: 2013-11-11

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Abstract

Ti44Al6Nb (atomic fraction, %) ingots with industry size were directionally solidified without contamination with electromagnetic cold crucible. Effects of pulling rates and powers on the surface quality, the S/L interface, grain morphology and phase selection were studied. The results show that the surface quality are improved by decreasing pulling rate or increasing power, they influence the surface quality by changing the superheat degree of the melt or the volume of the mushy zone. The S/L interface becomes concave and the grain width becomes big with increasing of pulling rate, the columnar grains grow discontinuously when the pulling rate is increased. The grain width decreases with the increase of the power. Columnar grain to equiaxed grain transition (CET) is easy to occurred when the pulling rate is lower or the power is higher. At the beginning of solidification, the initial phase is αphase when the pulling rate is 0.5 mm/min, whereas, it is β phase when the pulling rates are others.

Key words： Ti44Al6Nb alloy; cold crucible; directional solidification; microstructure

Cite this article

CHEN Ruirun , WANG Jichao , MA Tengfei , GUO Jingjie , DING Hongsheng , SU Yanqing , FU Hengzhi . MICROSTRUCTURE EVOLUTION OF Ti44Al6Nb ALLOY DIRECTIONALLY SOLIDIFIED WITH COLD CRUCIBLE[J]. Acta Metall Sin, 2013 , 49(11) : 1356 -1362 . DOI: 10.3724/SP.J.1037.2013.00550

References

[1] Lin J P, Zhao L L, Li G Y, Zhang L Q, Song X P, Ye F, Chen G L.Intermetallics, 2011; 19: 131

[2] Yang X, Xi Z P, Liu Y, Tang H, Hu K, Jia W P. Trans Nonferrerous Met Soc China, 2012; 22: 2628

[3] Song L, Zhang L Q, Xu X J, Sun J, Lin J P. Scr Mater, 2013; 68: 929

[4] Wang G, Xu L, Wang Y, Zheng Z, Cui Y Y, Yang R. Acta Metall Sin, 2011; 47: 587

(王刚, 徐磊, 王永, 郑卓, 崔玉友, 杨锐. 金属学报, 2011; 47: 587)

[5] Lin J P, Chen G L. Mater China, 2009; 28(1): 31

(林均品, 陈国良. 中国材料进展, 2009; 28(1): 31)

[6] Huang X, Qi L C, Li Z X. Rare Met Mater Eng, 2006; 35: 1845

(黄旭, 齐立春, 李臻熙. 稀有金属材料与工程, 2006; 35: 1845)

[7] Wang G, Zheng Z, Chang L T, Xu L, Cui Y Y, Yang R. Acta Metall Sin, 2011; 47: 1263

(王刚, 郑卓, 常立涛, 徐磊, 崔玉友, 杨锐. 金属学报, 2011; 47: 1263)

[8] Huang X, Qi L C, Li Z X. Rare Met Mater Eng, 2006; 35: 1848

(黄旭, 齐立春, 李臻熙. 稀有金属材料与工程, 2006; 35: 1848)

[9] Kartavykh A V, Tcherdyntsev V V, Zollinger J. Mater Chem Phys, 2010; 119: 347

[10] Zhang H R, Gao M, Tang X X, Zhang H. Acta Metall Sin, 2010; 46: 890

(张花蕊, 高明, 唐晓霞, 张虎. 金属学报, 2010; 46: 890)

[11] Luo W Z, Shen J, Min Z X, Fu H Z. Rare Met Mater Eng, 2009; 38: 1442

(罗文忠, 沈军, 闵志先, 傅恒志. 稀有金属材料与工程, 2009; 38: 1442)

[12] Yang J R, Chen R R, Ding H S, Guo J J, Su Y Q, Fu H Z. J Mater Process Technol, 2013; 213: 1355

[13] Yang J R, Chen R R, Ding H S, Guo J J, Han J C, Fu H Z.Intermetallics, 2013; 42: 184

[14] Ding H S, G J J, Chen R R, Fu H Z. Mater China, 2010; 29(2): 14

(丁宏升, 郭景杰, 陈瑞润, 傅恒志. 中国材料进展, 2010; 29(2): 14)

[15] Xiao Z X, Zheng L J, Yang L L, Yan J, Zhang H. Acta Metall Sin, 2010; 46: 1223

(肖志霞, 郑立静, 杨莉莉, 闫洁, 张虎. 金属学报, 2010; 46: 1223)

[16] Ding X F, Lin J P, Zhang L Q, Wang H L, Hao G J, Chen G L. J Alloys Compd, 2010; 506: 117

[17] Fu H Z, Guo J J, Su Y Q, Liu L, Xu D M, Li J S. Chin J Nonferrous Met, 2003; 13: 797

(傅恒志, 郭景杰, 苏彦庆, 刘林, 徐达鸣, 李金山. 中国有色金属学报, 2003; 13: 797)

[18] Saari H, Beddoes J, Seo D Y, Zhao L. Intermetallics, 2005; 13: 941

[19] Ding X F, Lin J P, Zhang L Q, Su Y Q, Chen G L. Acta Mater, 2012; 60: 498

[20] Liu D M, Li X Z, Su Y Q, Guo J J, Fu H Z. Intermetallics, 2011; 19: 175

[21] Blackburn M. Science, Techbology and Application of Titanium. London: Pergmin Press, 1970: 1

[22] Yamaguchi M, Johnson D R, Lee H N, Inui H. Intermetallics, 2000; 8: 511

[23] Murakami K, Fujiyama T, Koike A, Okamoto T. Acta Metall, 1983; 31: 1425

[24] Uhlmann D R, Seward T P, Chalmers B. Trans Metall Soc AIME, 1996; 236: 527

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