Microstructural Changes of FSX-414 Superalloy during TLP Bonding


Article Preview

The as-cast FSX-414 Co-based superalloy samples were solution treated at 1150oC for 4h and then aged at 980oC for 4h. Specimens for joining were cut from the as-cast ingot and TLP bonding carried out at the same conditions as for the solution and solution+aging treatment, using MBF-30 interlayer. Microstructures were studied for as-cast, heat treated and TLP bonded specimens. These studies showed that the ununiform distributed carbides of MC type in the as-cast specimens replaced by M23C6 type carbides with uniform distribution in the heat treated microstructure. Due to complete isothermal solidification, no eutectic structure in the bond region were wasobserved, but some intermetallics in the diffusion affected zone (DAZ) were observed. Microhardness tests were used to compare the hardness of age hardened specimens with bonded specimens at the same heat treatment condition. Hardness profile also showed a peak in DAZ region in spite of complete isothermal solidification.



Defect and Diffusion Forum (Volumes 312-315)

Edited by:

Andreas Öchsner, Graeme E. Murch and João M.P.Q. Delgado






R. Bakhtiari and A. Ekrami, "Microstructural Changes of FSX-414 Superalloy during TLP Bonding", Defect and Diffusion Forum, Vols. 312-315, pp. 399-404, 2011

Online since:

April 2011




[1] S. J. Balsone: Buckets and nozzles(General Electric Company, 2004).

[2] D. Coutsoursdis, A. Davin and M. Lamberigts: Mater. Sci. and Eng. Vol. 88 (1987), p.11.

[3] P.W. Schilke: Advanced Gas Turbine Materials and Coatings(General Electric Company, 2004).

[4] W. M. Miglietti: Wide gap diffusion braze repairs of nozzle segments cast from FSX-414 Co-based superalloy, 3rd International Brazing and Soldering Conference, Texas, USA (2004).

[5] W.A. Demo and S.J. Ferrigno: Brazing method helps repair aircraft gas turbine nozzles(Advanced Materials and Processes, 1992), p.43.

[6] O.A. Ojo, N.L. Richards and M.C. Charturvedi: Sci. Technol. Weld. Joining Vol. 9 (2004), p.209.

[7] O.A. Idowu, N.L. Richards and M.C. Chaturvedi: Mater. Sci. Eng. A Vol. 397 (2005), p.98.

[8] W.F. Gale and D.A. Butts: Sci. Technol. Weld. Joining Vol. 9 (2004), p.283.

[9] C. T. Sims and W. C. Hagel: The superalloys (John Wiley & Sons, NewYork, 1972), p.145.

[10] J. S. Lee, J. H. Lee, B. G. Choi, C. Y. Jo, U. Paik and S. G. Gang: Mater. Sci. For. Vol. 486-487 (2005), p.374.

[11] Information on http: /www. metglas. com/high performance brazing filler metal.

[12] D. Klarstrom and P. Crook, in: Metallography and Microstructures, edited by J. Wu, volume 9 of ASM Handbook, section, 4, ASM International (2004).

[13] D. A. Dantonio, D. Duhl and T. Howson, in: Heat treating, edited by M. F. Rothman, volume 4 of ASM Handbook, section, 7, ASM International (2004).

[14] W. H. Jiang, H. R. Guan and Z. Q. Hu: Metall. and Mater. Trans. A Vol. 30A (1999), p.2251.

[15] M. Pouranvari, A. Ekrami and A. H. Kokabi: Mater. Sci. and Eng. A Vol. 229 (2008), p.490.

[16] S. D. Henry, J. M. Davidson and M. A. Fleming, in: Alloy phase diagrams, edited by H. Baker, volume 3 of ASM Handbook, section, 2, ASM International (1992).

In order to see related information, you need to Login.