عنوان مقاله [English]
Inconel 718 is precipitation strengthened Ni-base superalloy that is strengthened by γ″ precipitate with the Ni3Nb chemical composition, widely used for medium and high temperature applications in different industries. Despite high resistance to strain aging cracking for Inconel 718, this alloy is more sensitive to solidification and liquation cracking. The main purpose of this investigation is to compare the effect of Nd:YAG pulsed laser and fiber continuous laser on the Microstructure, Connection Geometry and Hot cracking Mechanism in Inconel 718. For this purpose, an Nd: YAG pulsed laser device and a continuous wave fiber laser device were used. To determine the percentage of the elements, using the quantum test and an electron microscope and optical microscope (OM) was used to investigate the microstructure and electron microscopy (SEM) equipped with EDS also used for chemical analysis.
1. R.C. Reed, The superalloys: fundamentals and applications, Cambridge university press, 2008.
2. Roger, Fundamental of superalloy, n.d.
3. C.T. Sims, N.S. Stoloff, W.C. Hagel, S. II, High-temperature materials for aerospace and industrial power, A Wiley-Lnterscience Publ. John Wiley Sons, New York. (1987).
4. J.C. Lippold, S.D. Kiser, J.N. DuPont, Welding metallurgy and weldability of nickel-base alloys, John Wiley & Sons, 2011.
5. X. Ye, X. Hua, M. Wang, S. Lou, Controlling hot cracking in Ni-based Inconel-718 superalloy cast sheets during tungsten inert gas welding, J. Mater. Process. Technol. 222 (2015) 381–390.
6. Y. Mei, Y. Liu, C. Liu, C. Li, L. Yu, Q. Guo, et al., Effects of cold rolling on the precipitation kinetics and the morphology evolution of intermediate phases in Inconel 718 alloy, J. Alloys Compd. 649 (2015) 949–960.
7. K.H. Song, K. Nakata, Microstructural and mechanical properties of friction-stir-welded and post-heat-treated Inconel 718 alloy, J. Alloys Compd. 505 (2010) 144–150.
8. H.N. Moosavy, M.-R. Aboutalebi, S.H. Seyedein, M. Goodarzi, M. Khodabakhshi, C. Mapelli, et al., Modern fiber laser beam welding of the newly-designed precipitation-strengthened nickel-base superalloys, Opt. Laser Technol. 57 (2014) 12–20.
9. M. Montazeri, F.M. Ghaini, O.A. Ojo, Heat input and the liquation cracking of laser welded IN738LC superalloy, Weld. J. 92 (2013) 258s–264s.
10. A. Odabaşı, N. Ünlü, G. Göller, M.Ni̇. Eruslu, A study on laser beam welding (LBW) technique: effect of heat input on the microstructural evolution of superalloy Inconel 718, Metall. Mater. Trans. A. 41 (2010) 2357–2365.
11. B. Radhakrishnan, R.G. Thompson, A phase diagram approach to study liquation cracking in alloy 718, Metall. Mater. Trans. A. 22 (1991) 887–902.
12. S. Ku, WELDING METALLURGY, n.d.
13. D. Cornu, D. Gouhier, I. Richard, V. Bobin, C. Boudot, J. Gaudin, et al., Weldability of superalloys by Nd: YAG laser, Weld. Int. 9 (1995) 802–811.
14. M.P. Seah, E.D. Hondros, Grain boundary segregation, in: Proc. R. Soc. London A Math. Phys. Eng. Sci., The Royal Society, 1973: pp. 191–212.
15. T. Böllinghaus, Hot Cracking Phenomena in Welds, n.d.
16. T. Böllinghaus, H. Herold, C.E. Cross, J.C. Lippold, Hot cracking phenomena in welds II, Springer Science & Business Media, 2008.
17. W.A. Baeslack, D.E. Nelson, Morphology of weld heat-affected zone liquation in cast alloy 718, Metallography. 19 (1986) 371–379.
18. M. Sundararaman, P. Mukhopadhyay, S. Banerjee, Precipitation of the δ-Ni3Nb phase in two nickel base superalloys, Metall. Trans. A. 19 (1988) 453–465.
19. H. Baker, H. Okamoto, ASM handbook (vol. 3): alloy phase diagram, ASM Int. (1992).
20. A. Salminen, H. Piili, T. Purtonen, The characteristics of high power fibre laser welding, Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 224 (2010) 1019–1029.