Microstructure evolution in a single crystal nickel-based superalloy joint by linear friction welding |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi''an 710072, Shaanxi, PR China;2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;1. Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;2. School of Science and Engineering, University of the Sunshine Coast, Sippy Downs, Queensland 4575, Australia;1. School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom;2. School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom;1. Laboratory for Microstructure & Institute of Materials, Shanghai University, Shanghai 200072, China;2. Chongqing Key Laboratory of Photo-electric Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China;1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India;2. Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA;1. Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, 50-372 Wroclaw, Poland;2. Institute of Thin Films, Sensors & Imaging, University of the West of Scotland, Scottish Universities Physics Alliance, High Street, Paisley PA1 2BE, United Kingdom;3. University of Wroclaw, Institute of Experimental Physics, Max Born 9, 50-204 Wroclaw, Poland |
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| Abstract: | Linear friction welding (LFW) was used with a single crystal nickel-based superalloy to produce sound welds. Microstructural examination shows that the joint has a distinct weld zone (WZ) and thermomechanically affected zone (TMAZ). In the WZ, the microstructure has recrystallized polycrystals instead of a single crystal. In the TMAZ, the amount of γ′ phase increased from the TMAZ/WZ interface to the parent material (PM) and decreased from the periphery to the centre along the weld creating a U-shaped microhardness profile in the TMAZ. The microhardness is however lower than that in the WZ. The average tensile strength was found to be 837.5 ± 50 MPa, comparable to the PM (880 MPa 26]). |
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