Modeling, Optimization and Corrosion Analysis of FS Welded LM25-SiC MMCs

LM25-SiC metal matrix composites were manufactured by stir casting technique. The composites were welded by friction stir (FS) welding process. Experimental studies were carried out for specimens treated at different temperatures for FS welded composites, and pitting corrosion properties were evaluated. Mathematical models were developed to correlate welding process parameters to pitting potential. Excel solver software was used to optimize the pitting potential for FS welded MMCs. Composites reinforced with 10% SiC show maximum pitting corrosion resistance when treated at cryogenic temperature. FS welded MMCs show higher resistance to corrosion when processed at high temperature compared to MMCs of as-welded composites processed at cryogenic atmosphere.