Microstructural Response Of Powder Metallurgy (PM) RR1000 Superalloy To Inertia Friction Welding
Keywords:
Hardness, Intermetallic compounds, Superalloy, Grain boundary wettingAbstract
The microstructural response of powder metallurgy RR1000 superalloy to inertia friction welding was investigated. It was observed that the rapid heating during inertial friction welding resulted in a significant grain-boundary liquation of solid-state γ' precipitates, low temperature melting depressant intermetallic compound, and secondary solidification MC carbides constituents, which were all present in the preweld heat-treated alloy. Liquation of these particles enhanced grain boundary microfissuring in the thermomechanical affected zone (TMAZ) of the weldment. However, contrary to the generally observed increase in HAZ cracking in superalloys with an increase in Ti and Al concentration, due to increase in the hardness of the alloy and rapid re-precipitation of γ' strengthening particles during cooling from welding temperature, a significantly reduced cracking was observed in inertia friction welded PM RR1000 compared to the conventional gas tungsten arc welded cast IN738. This was despite the hardness being higher in the former than in the latter. This may be related to the solid state welding phenomena proffered by inertia friction welding which precludes the formation of liquid melt during welding.
References
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and microstructure formation in a cast nickel based superalloy-experiment and modelling’, in Proceedings of Superalloys Conference edited by S. D.Antolovich, R. W. Stusrud, R. A. Mackay, D. L. Anton, T. Khan, R. D. Kissinger and D. L. Klarstrom (The Minerals, Metals & Materials Society, 1992) p.165, 1992
Bjorneklett,; B.I.; Grong, O., Myhr, O.R. and Kluken, O.A. ‘Additivity and isokinetic behaviour in relation to particle dissolution’, Acta Mater. 46:6257, 1998.
Ernst, S.C.; Baeslack, W.A., Lippold J.C. ‘Weldability of high-strength low-expansion Superalloys’ Weld J. 68: 145, 1989.
Groh, J.R., ‘Effect of cooling rate from solution heat treatment on waspaloy microstructure and properties’, Superalloys’, 621-626, 1996.
Jahnke, B. ‘High-temperature electron beam welding of the nickel- base superalloy IN- 738LC’, Weld. J. 61: 343s–347s, 1982.
Koul, A.K.; and Wallace W. ‘Note on the microstructural dependence of creep strength in inconel 700’, Metallurgical and Materials Transactions A. 3A: 673- 675, 1982.
Lim, L.C.; Yi, J.Z., Liu, N. and Ma, Q. ‘Mechanism of post-weld heat treatment cracking in Rene 80 nickel based superalloy’, Mater. Sci. Technol. 18 (4): 407- 412, 2002.
Nakkalil, R.; Richards, N.L. and Chaturvedi, M.C. ‘Influence of solidification mode on heat affected zone microfissuring in a nickel-iron base superalloy’, Scripta Metall. Mater. 26: 1599–1603, 1992.
Ojo, O.A.; Richards, N.L. and Chaturvedi, M.C. ‘Liquation of various phases in HAZ during welding of cast Inconel* 738LC’, Mater. Sci. Technol. 20:1027–1034, 2004.
Ojo, O.A.; Richards, N.L. and Chaturvedi, M. C. ‘Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy’, Scripta Mater. 50: 641, 2004.
Owczarski, W.A.; Duvall, D.S. and Sullivan, C.P. ‘Model for heat-affected zone cracking in nickel-base superalloys’, Weld. J. 45: 145s–155s, 1966.
Pepe, J.J.; and Savage, W.F. ‘Effects of constitutional liquation in 18-Ni maraging steel weldments’, Weld J. 46: 411s–422s, 1967.
Prager, M.; and Sines, G. ‘Welding of precipitation-hardening nickel-base alloys’, Weld. Res. Counc. Bull. No. 150:24–32, 1970.
Preuss, M.; Pang, J.W.L., Withers, P.J. and Baxter, G.J. ‘Inertia welding nickel-based superalloy: Part I. Residual stress characterization’, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 33(10): 3215-3225, 2002.
Radhakrishnan, B. and Thompson, R.G. ‘Phase diagram approach to study liquation cracking in alloy 718’, Metall Trans;22A:887-902, 1991.
Radhakrishnan, B. and Thompson, R.G. ‘The effect of weld heat-affected zone (HAZ) liquation kinetics on the hot cracking susceptibility of alloy-718’, Metall. Trans. A, 24A:1409–15, 1993.
Reiso, O.; Ryum, N. and Strid, J. ‘Melting of secondary-phase particles in Al-Mg-Si alloys’, Metall Trans; 24A:2629-2641, 1993.
Romig, A.D. Jr.; Lippold, J.C. and Cieslak, M.J. ‘Analytical electron microscope investigation of the phase transformations in a simulated heat-affected zone in alloy 800’, Metall Trans;19A:35, 1988.
Sidhu, R.K.; Richards, N.L. and Chaturvedi, M.C. ‘Effect of aluminium concentration in
filler alloys on HAZ cracking in TIG welded cast lnconel 738LC superalloy’, Mater. Sci. Technol. 21 (10): 1119–31, 2005.
Sidhu, R.K.; Richards, N.L. and Chaturvedi, M.C. ‘Post-weld heat treatment cracking inautogenous GTA welded cast Inconel 738LC superalloy’, Mater. Sci. Technol. 23 (2): 203–13, 2007.
Silva, J.M. and A. Sousa E Brito. ‘Microstructural evaluation of a new generation PM nickel base superalloy’, Proceedings of the10th Portuguese Conference on Fracture, pp.1-6, 2006.
Soucail, M. and Bienvenu, Y. ‘Dissolution of the γ′ phase in a nickel base superalloy at equilibrium and under rapid heating’, Mater Sci Eng A. 220: 215, 1996.
Taha, M.; and Kurz, W. ‘About microsegregation of nickel base superalloys’. Z. Metallkd. 72: 546-549, 1981.
Thamburaj, R.; Wallace, W. and Goldak, J.A. ‘Post-weld heat-treatment cracking in Superalloys’, Int. Met. Rev., 28 (1):1–22, 1983.
Wang L.; Preuss, M., Withers, P.J. Baxter, G. and Wilson, P. ‘Energy-input-based finite-element process modelling of inertia welding’, Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 36(4): 513-523, 2005.
Wusatowska-Sarnek, A.M.; Blackburn, M.J. and Aindow, M. ‘Gamma Precipitation kinetics in P/M IN100 Thermec'2003, Pts 1-5,. 426-4: 767-772, 2003.
Zhou, J.; Wang, H. P., Doherty, R. and Perry, E. M. ‘Solidification behavior
and microstructure formation in a cast nickel based superalloy-experiment and modelling’, in Proceedings of Superalloys Conference edited by S. D.Antolovich, R. W. Stusrud, R. A. Mackay, D. L. Anton, T. Khan, R. D. Kissinger and D. L. Klarstrom (The Minerals, Metals & Materials Society, 1992) p.165, 1992
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Published
2011-05-01
How to Cite
Oluwasegun, K., Adeoye, M., Olorunniwo, O., & Atanda, P. (2011). Microstructural Response Of Powder Metallurgy (PM) RR1000 Superalloy To Inertia Friction Welding. Ife Journal of Technology, 20(1), 1–7. Retrieved from https://ijt.ng/index.php/ijt/article/view/72
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