Measurement of Residual Stresses in Linear Friction Welded In-Service Inconel 718 Superalloy

Abstract:

Measurement of residual strains by neutron diffraction of linear friction welded Inconel^® 718 (IN 718) superalloy acquired from a mid-service aero-engine disk was undertaken in this study. Residual strain and stress throughout the various weld regions including the heat affected zone (HAZ), thermomechanical affected zone (TMAZ) and dynamically recrystallized zone (DRX) were characterized. The residual stresses were observed to increase from the base material to the weld interface, with a peak stress at the weld interface in all orthogonal directions. The trends for residual stress across the weld are in agreement with other work published in literature for solid state welding of aerospace alloys, where high residual stresses were commonly reported at the weld interface.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1800-1806
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1800
• Online since: November 2016
• Authors: M. Smith*, L. Bichler, D. Sediako
• Keywords: Inconel 718, In-Service, Neutron Diffraction, Residual Stress, Superalloy

References

[1] A. Chamanfar et al., Microstructural characteristics of forged and heat treated Inconel 718 disks, Materials and Design, pp.791-800, (2013).

DOI: 10.1016/j.matdes.2013.06.004

[2] Y. Wang, W. Shao, L. Zhen, and B. Zhang, Hot deformation behavior of delta-processed superalloy 718, Material Science and Engineering A, vol. 528, pp.3218-3227, (2011).

DOI: 10.1016/j.msea.2011.01.013

[3] ASM International, ASM Specialty Handbook - Heat Resistant Materials.

[4] Kh. Al-hatab, M. Al-bukhaiti, U. Krupp, and M. Kantehm, Cyclic oxidation behavior of IN 718 superalloy in air at high temperatures, Oxidation of Materials, pp.209-228, (2011).

DOI: 10.1007/s11085-010-9230-6

[5] M. Qian and J. Lippold, Liquation phenomena in the simulated heat-affected zone of Alloy 718 after multiple postweld heat treatment cycles, Welding Journal, pp.145-150, (2003).

[6] M. Mehl and J. Lippold, Effect of delta phase precipitation on the repair weldability of Alloy 718, Superalloys 718, 625, 706 and Various Derivatives, pp.731-741, (1997).

DOI: 10.7449/1997/superalloys_1997_731_741

[7] M. Mecham. (2001) Aviation Week Network. [Online]. http: /aviationweek. com/awin/blue-arc-advancement.

[8] A. Mateo Garcia, BLISK fabrication by linear friction welding, in Advances in Gas Turbine Technology.: InTech, November 2011, pp.411-434.

DOI: 10.5772/21278

[9] Rolled Alloys Inc., Certified Materials Test Report, (2014).

[10] P. Wanjara and M. Jahazi, Linear friction welding of Ti-6Al-4V: Processing, microstructure and mechanical property inter-relationships, Metallurgical and Materials Transactions A, vol. 36A, pp.2149-2164, (2005).

DOI: 10.1007/s11661-005-0335-5

[11] T. Holden, Neutron diffraction in practical residual stress measurement methods, G. Schajer, Ed.: Wiley, (2013).

DOI: 10.1002/9781118402832.ch8

[12] M. Daymond and N. Bonner, Measurement of strain in a titanium linear friction weld by neutron diffraction, Physica B, vol. 325, pp.130-137, (2003).

DOI: 10.1016/s0921-4526(02)01514-4

[13] M. Preuss, P. Withers, and G. Baxter, A comparison of intertia friction welds in three nickel base superalloys, Materials Science and Engineering A, vol. 437, pp.38-45, (2006).

DOI: 10.1016/j.msea.2006.04.058

[14] N. Iqbal et al., A comparison of residual stress development in inertia friction welded fine grain and coarse grain nickel base superalloy, Metallurgical and Materials Transactions A, vol. 42A, pp.4056-4063, (2011).

DOI: 10.1007/s11661-011-0802-0

[15] ASTM, Standard guide for preparation of metallographic specimens, (2001).