Comparison of residual stresses in Ti–6Al–4V and Ti–6Al–2Sn–4Zr–2Mo linear friction welds

P. Frankel, M. Preuss, A. Steuwer, P. J. Withers, S. Bray

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In this paper, the levels of residual stress in the vicinity of linear friction welds in Ti-6Al-4V (Ti-64), a conventional α-β titanium alloy, and Ti-6Al-2Sn-4Zr-2Mo (Ti-6242), a near a titanium alloy with higher temperature capability, are mapped and contrasted. The alloys have significantly different high temperature properties and the aim of this work was to investigate how this might affect their propensity to accumulate weld residual stresses and their response to post-weld heat treatment. Measurements are reported using high energy synchrotron X-ray diffraction and the results are compared to those made destructively using the contour method. The strain free lattice plane d0 variation across the weld has been evaluated using the biaxial sin2y technique with laboratory Xrays. It was found that failure to account for the d0 variation across the weld line would have led to large errors in the peak tensile stresses. Contour method measurements show fairly good correlation with the diffraction results, although the stresses are underestimated. Possible reasons for the discrepancy are discussed. The peak tensile residual stresses introduced by the welding process were found to be greater for Ti-6242 (̃750 MPa) than for Ti-64 (̃650 MPa). Consistent with the higher temperature capability of the alloy, higher temperature post-weld heat treatments have been found to be necessary to relieve the stresses in the near a titanium alloy compared to the α+β titanium alloy. © 2009 Institute of Materials, Minerals and Mining.
    Original languageEnglish
    Pages (from-to)640-650
    Number of pages10
    JournalMaterials Science and Technology
    Volume25
    Issue number5
    DOIs
    Publication statusPublished - May 2009

    Keywords

    • Contour method
    • Linear friction welding
    • Residual stress
    • Synchrotron X-rays
    • Ti-6242
    • Ti-64

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