Attallah, Moataz M., Preuss, Michael, Boonchareon, Chatri, Steuwer, Axel, Daniels, John E., Hughes, Darren J., Dungey, Christopher and Baxter, Gavin J.. (2012) Microstructural and residual stress development due to inertia friction welding in Ti-6246. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Vol.43 (No.9). pp. 3149-3161. ISSN 1073-5623

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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 β transus, forming dynamically recrystallized β grains and precipitating acicular α within the β 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 α 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 β-rich weld zone. This was associated with the α → β phase transformation and the subsequent acicular α precipitation within the region surrounding the weld centerline.

Item Type:	Journal Article
Subjects:	T Technology > TS Manufactures
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Titanium alloys -- Welding, Friction welding
Journal or Publication Title:	Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Publisher:	Springer New York LLC
ISSN:	1073-5623
Date:	2012
Volume:	Vol.43
Number:	No.9
Page Range:	pp. 3149-3161
Identification Number:	10.1007/s11661-012-1116-6
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Rolls-Royce Group plc
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URI:	http://wrap.warwick.ac.uk/id/eprint/46854

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