Material properties governing wear of Co-based alloy tool during friction stir welding of steels
- Miyake M. ,
- Sato Y.S. ,
- Kokawa H. ,
- et al
- Miyake M. ,
- Sato Y.S. ,
- Kokawa H. ,
- Takaku Y. ,
- Omori T. ,
- Ishida K. ,
- Imano S. ,
- Park S.H.C. and
- Hirano S.
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Several kinds of Co-based alloys with different mechanical properties (e.g. high temperature strength, hardness, wear resistance and gamma-solvus temperature) were designed for friction stir welding (FSW) tool applications by varying chemical composition, and associated tool wear characteristics were studied after welding. The FSW tools comprised a shoulder (diameter 15 mm) and an unthreaded pin (length 1.7 mm). Welding performance was evaluated by experiments on a medium carbon steel (0.47%C, 0.63%Mn, 0.09%Cr, 0.07%Ni, 0.15%Cu) and an ultrahigh carbon steel (1%C, 0.39%Mn, 1.53%Cr, 0.07%Ni, 0.04%Cu). Tool shape was examined before and after welding by digital microscopy and tool wear was quantified by measurements of volume reduction after each FSW run. Tool material microstructure was observed by optical microscopy, SEM and electron backscatter diffraction. High temperature strength and room temperature wear resistance were evaluated by compression tests and a ball-on-disc tribometer, respectively.
9th International Symposium, 15-17 May 2012, Session 3B: FSW Tools, Paper 03
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