Tool material factors for suppression of wear in Co-based alloy tool during friction stir welding of 0.45C steel
- Sato Y.S. ,
- Miyake M. ,
- Kokawa H. ,
- et al
- Sato Y.S. ,
- Miyake M. ,
- Kokawa H. ,
- Omori T. ,
- Ishida K. ,
- Imano S. ,
- Sugimoto I. ,
- Park S.H.C. and
- Hirano S.
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A tool made from a Co-based alloy strengthened by precipitation of an intermetallic Co3(Al,W) gamma phase with an L12 structure was developed for friction stir welding of high-softening-temperature materials, such as a 0.45%C steel, and the tool wear mechanism and the material factors affecting tool wear were studied. Co alloys with different chemical compositions were fabricated by induction melting followed by heat treatment to obtain gamma' precipitates in the gamma matrix. The alloys were characterised by high-temperature strength, ball-on-disc wear resistance and room temperature hardness tests as well as gamma' solvus temperature measurements. Welding experiments were conducted at a travel speed of 1 mm/s and rotational speeds of 150 or 200 rpm. Tool shape was examined after each trial using a digital microscope and the tool wear volume was quantified. Microstructures were observed by optical microscopy, SEM and electron backscatter diffraction.
10th International Symposium, 20-22 May 2014, Session 2A: Steel I, Paper 01
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