13th International Conference on Fracture June 16–21, 2013, Beijing, China -10- the welds. Further studies should be done in order to identify other welding conditions susceptible to produce a metallurgically sound weld. According to our results, the supercooling strategy should be investigated further. Usage of a current pulsation or cooling shielding gas could favor the germination of equiaxe dendrites in the weld pool. Acknowledgements The authors wish to acknowledge Pratt & Whitney Canada for their support. References [1] D. F. Paulonis and J. J. Schirra, "Alloy 718 at Pratt and Whitney - Historical perspective and future challenges," in Superalloys 718, 625, 706 and Various Derivatives, Jun 17 - 20 2001, Pittsburgh, PA, United states, 2001, pp. 13-23. [2] B. T. Alexandrov, J. C. Lippold, and N. E. Nissley, "Evaluation of Weld Solidification Cracking in Ni-Base Superalloys Using the Cast Pin Tear Test," in Th. Böllinghaus, H. Herold, C.E. Cross, C. Lippold (Eds.), Hot Cracking Phenomena in Welds II, Berlin, 2008, pp. 193-213. [3] J. N. Dupont, J. C. Lippold, and S. D. Kiser, Welding metallurgy and weldability of nickel-base alloys, Hoboken, New Jersey: John Wiley & Sons, 2009. [4] O. Hunziker, D. Dye, and R. C. Reed, "On the formation of a centreline grain boundary during fusion welding," Acta Mater, vol. 48, pp. 4191-4201, 2000. [5] G. Sjoberg, T. Antonsson, S. Azadian, R. Warren, and H. Fredriksson, "Effect of -phase on the weldability and the hot ductility of alloy 718," in 6th International Symposium on Superalloys 718, 625, 706 and Derivatives, October 2, 2005 - October 5, 2005, Pittsburgh, PA, United states, 2005, pp. 351-362. [6] W. F. Savage and B. M. Krantz, "Investigation of hot cracking in hastelloy X," Welding J, vol. 44, pp. 13--25, 1966. [7] G. D. J. Ram, A. V. Reddy, K. P. Rao, and G. M. Reddy, "Control of Laves phase in Inconel 718 GTA welds with current pulsing," Sci Technol Weld Joi, vol. 9, pp. 390-398, 2004. [8] G. D. Janaki Ram, A. V. Reddy, K. P. Rao, and G. M. Reddy, "Improvement in stress rupture properties of inconel 718 gas tungsten arc welds using current pulsing," in J Mater Sci, 2005, pp. 1497-1500. [9] N. Kerrouault, "Fissuration à chaud en soudage d’un acier inoxydable austénitique," Ph.D. Ph.D., Mécanique et Matériaux, Ecole Centrale des Arts et Manufactures, Châtenay-Malabry Cedex, 2000. [10]K. Shinozaki, Y. Motomichi, P. Wen, and T. Tomoko, "Prediction of occurrence of solidification cracking in weld metal," Weld Inter, vol. 24, pp. 942-8, 2010. [11] K. Sivaprasad, S. Ganesh Sundara Raman, P. Mastanaiah, and G. Madhusudhan Reddy, "Influence of magnetic arc oscillation and current pulsing on microstructure and high temperature tensile strength of alloy 718 TIG weldments," Mat Sci Eng A, vol. 428, pp. 327-331, 2006. [12]S. Kou and Y. Le, "Welding parameters and the grain strudture of weld metal - A thermodynamic consideration," Metall Trans A, Physical metallurgy and materials science, vol. 19 A, pp. 1075-1082, 1988. [13]M. Gaumann, C. Bezencon, P. Canalis, and W. Kurz, "Single-crystal laser deposition of superalloys: processing-microstructure maps," Acta Mater, vol. 49, pp. 1051-62, 2001. [14]W. F. Savage, "1980 Houdremont lecture - Solidification, segregation and weld imperfections," Welding in the World, Le Soudage Dans Le Monde, vol. 18, pp. 89-114, 1980. [15]D. Dye, O. Hunziker, and R. C. Reed, "Numerical analysis of the weldability of superalloys," Acta Mater, vol. 49, pp. 683-697, 2001.
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