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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Microstructural and residual stress development due to inertia friction welding in Ti-6246
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Volume 43, No. 9, Year 2012
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Description
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 b transus, forming dynamically recrystallized b grains and precipitating acicular a within the b 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 a 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 ~4 mm from the weld centerline and not at the dynamically recrystallized b-rich weld zone. This was associated with the a fi b phase transformation and the subsequent acicular a precipitation within the region surrounding the weld centerline. © The Mineral, Metals & Materials Society and ASM International 2012.
Authors & Co-Authors
Attallah, Moataz M.
United Kingdom, Birmingham
University of Birmingham
Preuss, Michael
United Kingdom, Manchester
The University of Manchester
Steuwer, Axel
France, Grenoble
European Synchrotron Radiation Facility
Daniels, John E.
Australia, Sydney
Unsw Sydney
Hughes, Darren J.
France, Grenoble
Institut Laue-langevin
Statistics
Citations: 21
Authors: 5
Affiliations: 9
Identifiers
Doi:
10.1007/s11661-012-1116-6
ISSN:
10735623