A novel grain refiner composed of nickel, tungsten and yttria was prepared by the powder metallurgy way. The microstructure of the refiner alloy was studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The refinement process was simplized. It was shown that the alloy grains could be refined by addition of the refiners apparently even at high pouring temperature. The average grain size of the refiner free alloy was 4~mm, and 0.4 mm for the refined alloy. The fine-grain superalloy has excellent mechanical properties at intermediate temperature. The refinement mechanism was discussed.
JIANG Wei-Guo
,
YANG Meng-Chuan
,
LOU Lang-Hong
,
HOU Feng-Hua
,
HU Zhuang-Qi
. Preparation of Ni-W-10Y2O3 refiner and refinement mechanism in a superalloy[J]. Acta Metallurgica Sinica (English Letters), 2011
, 24(5)
: 365
-372
.
DOI: 10.11890/1006-7191-115-365
[1] R.C. Reed, The Superalloys Fundamentals and Applications (Cambridge University Press, 2006) p.1.
[2] B.L. Zhen, J Iron Steel Res 8(3) (1996) 51.
[3] C.N. Wei, H.Y. Bor, C.Y. Ma and T.S. Lee, Mater Chem Phys 80 (2003) 89.
[4] F. Torster, G. Baumeister, J. Albrecht, G. Lutjering, D.Helm and M.A. Daeubler, Mater Sci Eng A 234-236 (1997)189.
[5] H.J. Lu, X.C. Jia, K.F. Zhang and C.G. Yao, Mater Sci Eng A 326 (2002) 382.
[6] F. Liu, G.C. Yang and X.F. Guo, Mater Sci Eng A 311 (2001) 54.
[7] Y.H. Xiong, P.J. Li, A.M. Yang, W.D. Yan, D.B. Zeng and L.Liu. Acta Metall Sin 38(5) (2002) 529 (in Chinese).
[8] Y. Ma, J.H. Sun, X.S. Xie, Y.H. Hu, J.C. Zhao and P.Yan, J Mater Proc Technol 137 (2003) 35.
[9] W.Z. Jin, F.D. Bai, T.J. Li and G.M. Yin. Mater Lett 62 (2008) 1585.
[10] J.R. Brinegar, L.F. Norris and L. Rozenberg, In: M. Gell,C.S. Kortovich, R.H. Bricknell, W.B. Kent and J.F. Radavich, Superalloy (1984) p.23
[11] H. Hua, H.C. Qian, S.H. Award and S.M. Wu, Foundry Technol 25(4) (2004) 265.
[12] L. Liu, T.W. Huang, Y.H. Xiong, A.M. Yang, Z.L. Zhao, R.Zhang and J.S. Li, Mater Sci Eng A 39 (2005) 41.
[13] G.J. Abbaschian and S.A. David, Grain Refinement in Castings and Welds (1973) p.139.
[14] R.M. German, A. Bose and S.S. Mani, Metall Trans A 23A (1992) 211.
[15] Y.X. Li, X.Y. Lin, Y.Z. Wang, J.M. Luo and W.L. Sun, J Rare Earth 24 (2006) 34.
[16] G.J. Davies, Solidification and Casting (Applied Science Published, London, 1973) p.25.
[17] R.A. Overfelt, C.A. Matlock and M.E. Wells, Metall Mater Trans B 27B (1996) 698.
WeChat