Evolution of microstructure, microtexture and mechanical properties of linear friction welded IMI 834

  1. Get@NRC: Evolution of microstructure, microtexture and mechanical properties of linear friction welded IMI 834 (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1179/1879139512Y.0000000014
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Journal titleCanadian Metallurgical Quarterly
Pages269276; # of pages: 8
SubjectAerospace; Aerospace manufacturing; Axial pressures; Bladed rotors; Compressor discs; Digital image correlations; EBSD analysis; Electron back scatter diffraction; Fatigue strength; Fusion welding; High tech; IMI834; Linear friction; Linear friction welding; Mechanical fastening; Micro-texture; Microstructural examination; Parent materials; Phase fractions; Thermomechanically affected zones; Weld zone; Weldments; Aerospace industry; Friction welding; Microstructural evolution; Molybdenum; Niobium; Recrystallization (metallurgy); Tensile testing; Textures; Tin; Titanium alloys; Welding; Welds; Zirconium; Creep resistance
AbstractTitanium alloys have been of great interest in the aerospace industry for many years. Recently, linear friction welding has also been making strides in conquering a part of the aerospace manufacturing market, with its clear advantages over fusion welding and mechanical fastening methods for integrated bladed rotors. High tech near-α alloy IMI834 (Ti-5·8Al-4Sn- 3·5Zr-0·7Nb- 0·5Mo-0·35Si) was designed to have improved creep resistance and retains its mechanical properties at temperatures up to 600°C. It balances creep resistance and fatigue strength, making it an excellent material for compressor discs and blades. IMI834 with an initial bimodal αzb microstructure was welded using varying axial pressures during welding and then characterised using both microstructural examination and mechanical testing. Electron backscatter diffraction (EBSD) was used to characterise the texture and phase fraction of the welded IMI834 samples in the weld zone (WZ) and thermomechanically affected zones. The EBSD analysis revealed fine recrystallised grains at the weld centres. The microhardness evaluation of the weldments showed that the recrystallised WZ was slightly harder than the parent material (PM). The local and global tensile properties of the welds, investigated using a tensile testing rig with integrated digital image correlation, revealed higher strength in the WZ and failure in the PM. © 2012 Crown in Right of Canada.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21269173
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Record identifierbddb1f08-4028-41a9-98bb-12d68beb9beb
Record created2013-12-12
Record modified2016-05-09
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