EBSD STUDIES OF GRAIN EVOLUTION AND GRAIN SELECTION BEHAVIOR DURING THE PREPARATION OF Ni–BASED SINGLE CRYSTAL SUPERALLOY DD3
GAO Sifeng, LIU Lin, WANG Ning, ZHAO Xinbao, ZHANG Jun, FU Hengzhi
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072
Cite this article:
GAO Sifeng LIU Lin WANG Ning ZHAO Xinbao ZHANG Jun FU Hengzhi. EBSD STUDIES OF GRAIN EVOLUTION AND GRAIN SELECTION BEHAVIOR DURING THE PREPARATION OF Ni–BASED SINGLE CRYSTAL SUPERALLOY DD3. Acta Metall Sin, 2011, 47(10): 1251-1256.
Abstract Ni–based single–crystal superalloy DD3 was prepared by using the modified Bridgman apparatus with spiral grain selector. Grain structure evolution and grain selection in spiral selector have been investigated. Electron back scattered diffraction (EBSD) technique was used to characterize the grain texture evolution. The main function of starter block is to optimize the grain orientations. At the height of 36.1 mm from the copper chill plate, the misorientations of nearly 90% grains are less than 10?, and few grains’ orientations deviate from solidification direction more than 12?. Finally, only one grain is allowed to grow into the cast by grain selcting with one pitch in spiral part. Moreover, due to the geometric constraint of spiral selector, the grains near the outer wall are gradually overgrown by the grains close to the inner wall of spiral passage. The grain selection in the spiral selector can be mainly attributed to the geometric constraint of narrow passage.
Supported by National Basic Research Program of China (Nos.2010CB631202 and 2011CB610406), National Natural Science Foundation of China (Nos.50827102 and 50931004) and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU) (No.09–BZ–2010)
[2] Gell M, Duhl D N, Giamei A F. In: Tien J K, Wlodek S T, Morrow III H, Gell M, Maurer G E eds., Superalloys 1980, Pennsylvania, Metals Park, OH: American Society for Metals, 1980: 205
[3] Ross E W, O’Hara K S. In: Kissinger R D, Deye D J, Anton D L, Cetel A D, Nathal M V, Pollwk T M,Woodford D A eds., Superalloys 1996, Pennsylvania, Warrendale, PA: TMS, 1996: 19
[4] Kear B H, Piearcey B J. Trans Metall Soc AIME, 1967; 239: 1209
[5] Li J R, Zhao J Q, Liu S Z, Han M. In: Reed R C, Green K A, Caron P, Gabb T P, Fahrmann M G, Huron E S, Woodard S R eds., Superalloys 2008, Pennsylvania, Warrendale, PA: TMS, 2008: 443
[6] Higginbotham G J S. Mater Technol, 1986; 2: 442
[7] Goulette M J, Spiling P D, Arthey R P. In: Gell M, Kortovich C S, Bricknell R H, Kent W B, Radavich J F eds., Superalloy 1984, New York, Warrendale, PA: TMS, 1984: 167
[8] Carter P, Cox D C, Gandin C A, Reed R C. Mater Sci Eng, 2000; A280: 233
[9] Esaka H, Shinozuka K, Tamura M. Mater Sci Eng, 2005; A413–414: 151
[10] Dai H J, Gebelin J C, D’Souza N, Brown P D, Dong H B. Int J Cast Met Res, 2009; 22(1—4): 54
[11] Dai H J, Gebelin J C, Newell M, Reed R C, D’Souza N, Brown P D, Dong H B. In: Reed R C, Green K A, Caron P, Gabb T P, Fahrmann M G, Huron E S, Woodard S R eds., Superalloys 2008, Pennsylvania, Warrendale, PA: TMS, 2008: 367
[12] Zheng Q, Hou G C, Tian W M, Jin T, Sun X F, Guan H R, Hu Z Q. Trans Nonferrous Met Soc China, 2001; 11: 176
[13] Seo S M, Kim I S, Lee J H, Jo C Y, Miyahara H, Ogi K. Met Mater Int, 2009; 15: 391
[14] Ardakani M G, D’Souza N, Shollock B A, McLean M. Metall Mater Trans, 2000; 31A: 2887
[15] D’Souza N, Ardakani M G, McLean M, Shollock B A. Metall Mater Trans, 2000; 31A: 2877
[16] Gandin C A, Rappaz M, West D, Adams B L. Metall Mater Trans, 1995; 26A: 1543
[17] Walton D, Chalmers B. Trans Metall Soc AIME, 1959; 215: 447
[18] Zhou Y Z, Green N R. In: Reed R C, Green K A, Caron P, Gabb T P, Fahrmann M G, Huron E S, Woodard S R eds., Superalloys 2008, Pennsylvania, Warrendale, PA: TMS, 2008: 367
[19] Rappaz M, Gandin C A, Desbiolles J L, Thevoz P. Metall Mater Trans, 1996; 27A: 695
[20] Zhou Y Z, Volek A, Green N R. Acta Mater, 2008; 56: 2631
[21] Zhou Y Z, Jin T, Sun X F. Acta Metall Sin, 2010; 46: 1327
(周亦胄, 金涛, 孙晓峰. 金属学报, 2010; 46: 1327)
[22] Zhao X B. PhD Thesis, Northwestern Polytechnical University, Xi’an, 2010
