Paper Title:
Embrittlement of Ti-23Al-17Nb Alloy Laser Welded Joint at 650°C
  Abstract

The tensile ductility of the Ti-23Al-17Nb (at.%) alloy laser welded joints is very low at 650°C, so the embrittlement of the joints at high temperature was investigated. The metastable coarse B2 phase of the as-welded metal transformed into coarse O phase in the weld zone when the joints were heated up to 650°C. This type of phase transformation was based on shear transformation. Coarse orthorhombic O phase has lower ductility compared with body-centered cubic B2 phase. Meanwhile, the shear transformation from B2 to O phase could induce stress-strain concentrations in the grain boundary, which seriously weakened the grain boundary of the columnar grains and led to the brittle fracture characteristics in the weld zone during tensile test at 650°C.

  Info
Periodical
Materials Science Forum (Volumes 675-677)
Edited by
Yi Tan and Dongying Ju
Pages
743-746
DOI
10.4028/www.scientific.net/MSF.675-677.743
Citation
Z. H. Song, A. P. Wu, G. Q. Wang, G. S. Zou, J. L. Ren, "Embrittlement of Ti-23Al-17Nb Alloy Laser Welded Joint at 650°C", Materials Science Forum, Vols. 675-677, pp. 743-746, 2011
Online since
February 2011
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$32.00
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