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Effect of thermal processing on the microstructure of Ti-26Al-11Nb: Applications to fusion welding

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Abstract

The possible microstructures resulting from both fusion and solid-state processing of Ti-26Al-11Nb at. pct (Ti-15Al-21Nb wt pct) have been determined. The particular microstructure produced was primarily a function of the cooling rate from theβ solvus. The most rapid cooling rate, associated with pulsed Nd:YAG (yttrium-aluminum-garnet) laser welding, resulted in a microstructure in which the high-temperatureβ underwent an ordering reaction on cooling to the CsCl (B2) crystal structure. Intermediate cooling rate (≈60 °C/s) specimens [characteristic of the fusion zone and heat-affected zone (HAZ) in arc welds] were found to undergo a complete transformation (no retainedβ observed) to an acicularα 2 microstructure. Electron microprobe and analytical electron microscopy (AEM) analyses revealed no statistically significant compositional dψerences spatially within this structure. These two observations suggest that the transformation reaction in this cooling rate regime involves, at least in part, a compositionally invariant shear component. Controlled slow cooling rate (0.1 °C/s) experiments produced Widmanstätten microstructures which were two-phase (α 2 +β). The retainedβ phase was observed to be highly enriched (≈35 wt pct) in Nb. The transformedα 2 exhibited a very low dislocation density. Solidification cracking of fusion welds was not observed.

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Authors and Affiliations

  1. Process Metallurgy Division 1833, Sandia National Laboratories, 87185, Albuquerque, NM

    M. J. Cieslak (Senior Member of Technical Staff)

  2. Electron Optics Division 1822, Sandia National Laboratories, 87185, Albuquerque, NM

    T. J. Headley (Senior Member of Technical Staff)

  3. Department of Welding Engineering, The Ohio State University, 43210, Columbus, OH

    W. A. Baeslack (Professor)

Authors
  1. M. J. Cieslak
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  2. T. J. Headley
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  3. W. A. Baeslack
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Cieslak, M.J., Headley, T.J. & Baeslack, W.A. Effect of thermal processing on the microstructure of Ti-26Al-11Nb: Applications to fusion welding. Metall Trans A 21, 1273–1286 (1990). https://doi.org/10.1007/BF02698255

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