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Microstructural features of friction welded MA 956 superalloy material

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Abstract

The microstructural features of MA 956 friction welds were examined using a combination of optical microscopy and transmission electron microscopy (TEM). The MA 956 base material contained a uniform distribution of small diameter (<20 nm) Y2O3 particles. Limited numbers of larger diameter (>100 nm), spherically shaped Al2O3, Ti(C,N), Y2O3-Al2O3, and Al-Ti-Y containing particles were also observed in the MA 956 base material. In the recrystallized region, the grain size was largest at the bondline and increased markedly in the radial direction of the welded joint. Increasing the forging pressure from 50 to 150 MPa during the friction welding operation markedly increased the strain rate and decreased the grain size at the joint centerline. The friction welding operation substantially altered the particle chemistry, dimensions, and shape in the joint region. The number of aluminum-rich or titanium-rich particles was substantially decreased and large irregularly shaped particles were formed.

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Authors and Affiliations

  1. the Department of Metallurgical Engineering, Pusan University, 609-735, Pusan, Korea

    C. Y. Kang (Professor)

  2. the Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4, Toronto, ON, Canada

    T. H. North (Professor) & D. D. Perovic (Associate Professor)

Authors
  1. C. Y. Kang
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  2. T. H. North
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  3. D. D. Perovic
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Kang, C.Y., North, T.H. & Perovic, D.D. Microstructural features of friction welded MA 956 superalloy material. Metall Mater Trans A 27, 4019–4029 (1996). https://doi.org/10.1007/BF02595651

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  • DOI: https://doi.org/10.1007/BF02595651

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