Texture development in Ti-6Al-4V linear friction welds

M. Karadge, M. Preuss, C. Lovell, P. J. Withers, S. Bray

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118 Citations (Scopus)

Abstract

Microstructure and microtexture development in as-welded and post weld heat treated (PWHT) lab-scale (LS) and full-scale (FS) Ti-6Al-4V linear friction welds have been characterized using scanning electron microscopy and electron back-scatter diffraction (EBSD). The full-scale specimens exhibited a plastically affected zone (PAZ) about twice the size compared to lab-scale test welds. At the weld line a region of very fine martensitically formed microstructure was observed in both the LS and FS friction welds. EBSD texture scans across the weld line revealed a sharp texture variation in the PAZ. At the weld line a strong { 1 0 over(1, ̄) 0 } 〈 1 1 over(2, ̄) 0 〉 transverse texture for the as-welded and PWHTed condition was observed in both welds. Whereas the lab-scale linear friction welds displayed a dramatic change from almost random to strong transverse texture in the PAZ, the full-scale linear friction welds exhibited transverse texture at the weld line, followed by dispersed bands of transverse and { 1 1 over(2, ̄) 2 } 〈 1 1 over(2, ̄) 3 〉 type rolling texture in the PAZ region. The observed difference in LS and FS weld region textures is attributed to a difference in the variant selections during β → α transformation.

Original languageEnglish
Pages (from-to)182-191
Number of pages10
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume459
Issue number1-2
DOIs
Publication statusPublished - 25 Jun 2007
Externally publishedYes

Keywords

  • Deformation
  • EBSD
  • Linear friction welding
  • Texture
  • Ti-6Al-4V

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