Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 22, Issue 6, Pages 1807-1813Publisher
SPRINGER
DOI: 10.1007/s11665-012-0468-9
Keywords
friction stir welding; materials selection; metal matrix composites; tool wear
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Funding
- NASA GSRP Fellowship from Marshall Spaceflight Center
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Friction stir welding (FSW) is the preferred joining method for metal-matrix composites (MMCs). As a solid-state process, it precludes formation of the intermetallic precipitates responsible for degradation of mechanical properties in fusion welds of MMCs. The major barrier to FSW of MMCs is the rapid and severe wear of the welding pin tool, a consequence of prolonged contact between the tool and the harder reinforcements which give the material its enhanced strength. This study evaluates the effectiveness of harder tool materials to combat wear in the FSW of MMCs. The tool materials considered are O1 steel, cemented carbide (WC-Co) of the micrograin and submicrograin varieties, and WC-Co coated with diamond. The challenges which accompany the application of harder tool materials and diamond coatings in FSW are also discussed. This study represents the first use of diamond-coated tools in FSW and the first comparative evaluation of tool materials for this application.
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