A nickel base single crystal (SC) superalloy was directionally solidified using liquid metal cooling (LMC) process at various withdrawal rates. The microstructure was refined as increasing the withdrawal rate from 3 to 12 mm/min. However, higher withdrawal rate of 15 mm/min induced the formation of stray grains. Size and volume fraction of the eutectics were found to decrease with the increasing in withdrawal rate. After solution heat treatment at 1250°C, un-dissolved eutectic was observed in specimens. High temperature creep rupture life was observed to be very sensitive to the fraction of these remaining eutectics. Creep rupture tests at 1000°C/235 MPa showed that refined microstructure and low fraction of the remaining eutectic lead to significant improvement of the rupture life.
参考文献
| [1] | |
| [2] | P. Caron and T. Khan: Aerosp. Sci. Technol., 1999, (3), 513.[2]G.E. Fuchs: Mater. Sci. Eng., 2001, 300A, 52.[3] Y.A. Bondarenko and E.N. Kablov: Metal Sci. Heat Treatment, 2002, 44, 288. [4]E.N. Kablov, V.V. Gerasimov, V.A. Dubrovskii and E.M. Visik: Mater. Eng., 1996, 5, 16. (in Chinese)[5] M. Konter and M. Thumann: J. Mater. Process. Technol, 2001, 117, 386.[6]A.F. Giamei and J.G. Tschinkel: Metall. Mater. Trans., 1976, 7A, 1427.[7]A. Lohmueller, W. Esser, J. Grossmann, M. Hoerdler, J. Preuhs and R.F. Singer: in Superalloys 2000, eds. T.M. Pollock, R.D. Kissinger, R.R. Bowman, K.A. Green, M. Mclean, S. Olson and J.J. Schirra, TMS, Warrendale, PA, 2000, 181.[8]J. Zhang and L.H. Lou: J. Mater. Sci. Technol., 2007, 23(3), 289.[9]A.J. Eillott, S. Tin, W.T. King, S.C. Huang, M.F.X. Gigliotti and T.M. Pollock: Metall. Mater. Trans., 2004, 35A, 3221.[10]R.C. Reed: in The Superalloys Fundamentals and Applications, Cambridge University Press, 2006, 136.[11]A.J. Eillott and T.M. Pollock: Metall. Mater. Trans., 2007, 38A, 871.[12]A. Kermanpur, N. Varahram, P. Davami and M. Pappaz: Metall. Mater. Trans., 2000, 31B, 1293.[13]M. Lamm, A. Volek, O. Luesebrink and R.F. Singer: in Mater. Adv. Power Eng., 2006, eds. J.Lecomte-Beckers, M.Carton, F.Schubert and P.J.Ennis, Froschungszentrum Juelich GmbH, Juelich, 2006, 334.[14]S. Balsone, G.J. Feng, L. Peterson and J. Schaeffer: in Solidication Processes and Microstructures-A Sym-posium in Honor of Wilfried Kurz, eds. M. Rappaz, C. Beckermann and R. Trivedi, TMS, 2004, 77.[15]W.S. Tang, J. Shen, D.W. Wang, J. Zhang and L.H. Lou: in Proc. 138th Annual Meeting & |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%