Improvement of bonding strength between WC-12Co cemented carbide and tool steel by friction stir processing
- Nagaoka T. ,
- Kimito Y. ,
- Watanabe H. ,
- et al
- Nagaoka T. ,
- Kimito Y. ,
- Watanabe H. ,
- Fukusumi M. ,
- Morisada Y. and
- Fujii H.
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WC, 12%Co cemented carbide layers were deposited onto M2 tool steel (0.8-0.88%C, 3.8-4.5%Cr, 4.7-5.2%Mo, 5.9-6.7%W, 1.7-2.1%V) substrates by HVOF spraying and the effect of subsequent friction stir processing (FSP) on bonding strength and cermet coating hardness was investigated. FSP was carried out at a rotational speed of 600 rpm, travel speed of 50 mm/min and forging load of 9.8-19.6 kN. The microstructures of the cemented carbide layer and substrate were observed by optical microscopy and SEM. Cross sectional porosity was measured by image analysis. Microhardness and shear strength were determined with a micro Vickers hardness tester and a bonding tester, respectively. The influence of FSP forging load and heat input on bonding strength, densification, hardening and brittle eta phase growth is discussed.
11th International Symposium, 17-19 May 2016, Session 4B: FSP, Paper 01
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