|
|
EVOLUTION OF INTERFACE AND CRYSTAL ORIENTATION OF LASER SOLID FORMED GH4169 SUPERALLOY DURING RECRYSTALLIZATION |
LIU Fencheng1(), LIN Xin2, YU Xiaobin1, HUANG Chunping1, HUANG Weidong2 |
1 National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063 2 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 |
|
Cite this article:
LIU Fencheng, LIN Xin, YU Xiaobin, HUANG Chunping, HUANG Weidong. EVOLUTION OF INTERFACE AND CRYSTAL ORIENTATION OF LASER SOLID FORMED GH4169 SUPERALLOY DURING RECRYSTALLIZATION. Acta Metall Sin, 2014, 50(4): 463-470.
|
Abstract The dynamic-load mechanical of laser solid forming (LSF) GH4l69 Ni-based superalloy is influenced by the coarse columnar grains formed in LSF processing and then its application in jet engines like turbine disks is limited. The previous study showed that the grain structure of the LSF GH4l69 superalloy can be refined by recrystallization processing during post heat treatment. In this work, the microstructure, interface and crystal orientation of the as-deposited and heat treated LSF GH4169 superalloy samples were investigated by EBSD analysis. It was found that the crystal orientations of grains become more randomly organized as the grain structure of the LSF GH4169 superalloy was refined by heat treatment and the holding time of heat treatment was increased. Subsequently, microstructural anisotropy existed in the as-deposited samples was disappeared in the heat treated samples and the fraction of high angle grain boundary was increased greatly. < 111> 60° twin crystal boundary was presented during the later period of recrystallization and the volume fraction of the twin crystal boundary reached up to 44%. This indicated that the formation of twin crystal boundary during static recrystallization of LSF GH4169 samples played an important role in the refinement of grain structure. Sub-grain and grain-boundary migration nucleation were the main nucleation mechanisms at the beginning of the recrystallization and nucleation related to twin was one of the most important mechanisms in the later period of the recrystallization.
|
Received: 11 July 2013
|
|
Fund: Supported by National Natural Science Foundation of China (Nos.51201087 and 51165038), Natural Science Foundation of Jiangxi (No.20132BAB216013), Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University (Nos.SKLSP201306 and SKLSP201225), Project of Education Department of Jiangxi Province (No.GJJ13493) and Fund of Nanchang Hangkong University (No.EA201203072) |
[1] |
Huang W D,Lin X,Chen J,Liu Z X,Li Y M. Laser Solid Forming. Xi'an: Northwestern Polytechnical University Press, 2007: 10
|
|
(黄卫东,林 鑫,陈 静,刘振侠,李延民. 激光立体成形. 西安: 西北工业大学出版社, 2007: 10)
|
[2] |
Lin X, Yang H O, Chen J, Huang W D. Acta Metall Sin, 2006; 42: 361
|
|
(林 鑫, 杨海鸥, 陈 静, 黄卫东. 金属学报, 2006; 42: 361)
|
[3] |
Gaumann M, Bezencon C, Canalis P, Kurz W. Acta Mater, 2001; 49: 1051
|
[4] |
Feng L P, Huang W D, Lin X, Yang H O. Chin J Nonferrous Met, 2003; 13: 181
|
|
(冯莉萍, 黄卫东, 林 鑫, 杨海鸥. 中国有色金属学报, 2003; 13: 181)
|
[5] |
Feng L P, Huang W D, Li Y M, Yang H O, Lin X. Acta Metall Sin, 2002; 38: 502
|
|
(冯莉萍, 黄卫东, 李延民, 杨海鸥, 林 鑫. 金属学报, 2002; 38: 502)
|
[6] |
Kobayashi K, Yamaguchi M, Hayakawa M, Kimura M. Acta Metall Sin (Eng Lett), 2004; 17: 345
|
[7] |
Merrick H F. Metall Mater Trans, 1974; 5B: 891
|
[8] |
Thompson A W, Bucci R J. Metall Mater Trans, 1973; 4B: 1173
|
[9] |
Yamaguchi K, Kanazawa K. Metall Mater Trans, 1980; 11A: 1691
|
[10] |
Andersson J. Int J Fatigue, 2005; 27: 847.
|
[11] |
Liu F C, Lin X, Yang G L, Huang C P, Chen J, Huang W D. Acta Metall Sin, 2010; 46: 1047
|
|
(刘奋成, 林 鑫, 杨高林, 黄春平, 陈 静, 黄卫东. 金属学报, 2010; 46: 1047)
|
[12] |
Liu F C, Lin X, Yang G L, Song M H, Chen J, Huang W D. Rare Met, 2011; 30(Spec): 437
|
[13] |
Kaibyshev R, Gajnutdinova N, Valitov V. In: Gottstein G, Molodov D A eds., Proc 1st Joint Int Conf on Recrystallization and Grain Growth. New York: Springer, 2001: 949
|
[14] |
Belyakov A, Miura H, Sakai T. Mater Sci Eng, 1998; A255: 139
|
[15] |
Humphreys F J,Hatherly M. Recrystallization and Related Annealing Phenomena. Oxford: Pergamon Press, 2004: 427
|
[16] |
Wang Y. PhD Dissertation, Harbin Institute of Technology, 2008
|
|
(王 岩. 哈尔滨工业大学博士学位论文, 2008)
|
[17] |
Mahajan S, Pande C S, Imam M A, Rath B B. Acta Mater, 1997; 45: 2633
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|