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Microstructural and Residual Stress Development due to Inertia Friction Welding in Ti-6246

Attallah, Moataz M.; Preuss, Michael; Boonchareon, Chatri; Steuwer, Axel LU ; Daniels, John E.; Hughes, Darren J.; Dungey, Christopher and Baxter, Gavin J. (2012) In Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science 43A(9). p.3149-3161
Abstract
A thorough investigation has been performed to assess the microstructural properties, mechanical properties (hardness and elastic modulus), and residual stress development in Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) inertia friction welds in the as-welded and postweld heat-treated conditions. It was evident that the thermomechanical deformation in the weld region occurred above the beta transus, forming dynamically recrystallized beta grains and precipitating acicular alpha within the beta grains, which resulted in a localized hardness increase. In the heat-affected zone, a ghost microstructure of the base metal formed because of the absence of sufficient time for diffusion, resulting in Mo segregation in the prior primary alpha plates.... (More)
A thorough investigation has been performed to assess the microstructural properties, mechanical properties (hardness and elastic modulus), and residual stress development in Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) inertia friction welds in the as-welded and postweld heat-treated conditions. It was evident that the thermomechanical deformation in the weld region occurred above the beta transus, forming dynamically recrystallized beta grains and precipitating acicular alpha within the beta grains, which resulted in a localized hardness increase. In the heat-affected zone, a ghost microstructure of the base metal formed because of the absence of sufficient time for diffusion, resulting in Mo segregation in the prior primary alpha plates. Energy-dispersive synchrotron X-ray diffraction and neutron diffraction were used to assess the residual stress development in the three principal directions. The variation in the unstrained lattice parameters across the weld regions was established by imposing a stress balance on the axial stress component in the radial direction. It was found that the maximum stresses occurred in the hoop direction, with significantly lower stresses present in the radial and axial directions. The maximum tensile hoop stresses were located at similar to 4 mm from the weld centerline and not at the dynamically recrystallized beta-rich weld zone. This was associated with the alpha -> beta phase transformation and the subsequent acicular alpha precipitation within the region surrounding the weld centerline. (Less)
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type
Contribution to journal
publication status
published
subject
in
Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
volume
43A
issue
9
pages
3149 - 3161
publisher
Springer
external identifiers
  • wos:000306588900016
  • scopus:84864652098
ISSN
1073-5623
DOI
10.1007/s11661-012-1116-6
language
English
LU publication?
yes
id
db8364c1-e20f-4fb9-8ffc-224030c7357d (old id 3070081)
date added to LUP
2012-09-26 08:36:56
date last changed
2017-08-27 04:56:50
@article{db8364c1-e20f-4fb9-8ffc-224030c7357d,
  abstract     = {A thorough investigation has been performed to assess the microstructural properties, mechanical properties (hardness and elastic modulus), and residual stress development in Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) inertia friction welds in the as-welded and postweld heat-treated conditions. It was evident that the thermomechanical deformation in the weld region occurred above the beta transus, forming dynamically recrystallized beta grains and precipitating acicular alpha within the beta grains, which resulted in a localized hardness increase. In the heat-affected zone, a ghost microstructure of the base metal formed because of the absence of sufficient time for diffusion, resulting in Mo segregation in the prior primary alpha plates. Energy-dispersive synchrotron X-ray diffraction and neutron diffraction were used to assess the residual stress development in the three principal directions. The variation in the unstrained lattice parameters across the weld regions was established by imposing a stress balance on the axial stress component in the radial direction. It was found that the maximum stresses occurred in the hoop direction, with significantly lower stresses present in the radial and axial directions. The maximum tensile hoop stresses were located at similar to 4 mm from the weld centerline and not at the dynamically recrystallized beta-rich weld zone. This was associated with the alpha -> beta phase transformation and the subsequent acicular alpha precipitation within the region surrounding the weld centerline.},
  author       = {Attallah, Moataz M. and Preuss, Michael and Boonchareon, Chatri and Steuwer, Axel and Daniels, John E. and Hughes, Darren J. and Dungey, Christopher and Baxter, Gavin J.},
  issn         = {1073-5623},
  language     = {eng},
  number       = {9},
  pages        = {3149--3161},
  publisher    = {Springer},
  series       = {Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science},
  title        = {Microstructural and Residual Stress Development due to Inertia Friction Welding in Ti-6246},
  url          = {http://dx.doi.org/10.1007/s11661-012-1116-6},
  volume       = {43A},
  year         = {2012},
}