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Enhanced resistance to weld cracking by strain-induced rapid solidification during linear friction welding |
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| Authors: | O.T. Ola P. Wanjara M.C. Chaturvedi |
| Affiliation: | 1. Department of Mechanical and Manufacturing Engineering , University of Manitoba , Winnipeg, MB R3T 5V6, Canada;2. National Research Council Canada, Aerospace Manufacturing Technology Centre, Institute for Aerospace Research , 5145 Avenue Decelles Montréal, QC H3T 2B2, Canada |
| Abstract: | A study of weld cracking resistance during linear friction joining of a difficult-to-weld nickel-based superalloy was performed by Gleeble thermomechanical simulation coupled with an extensive microstructural analysis. It was found that crack-free welds produced by the supposedly solid-state joining technique of linear friction welding is not due to preclusion of grain boundary liquation as has been commonly assumed and reported. Instead, resistance to cracking can be related to a reduction in liquid stability by the imposed compressive strain during welding. |
| Keywords: | rapid solidification friction welding nickel alloys stress-assisted diffusion weld cracking |