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Stress rupture test of MAR-M509 alloy with structure refined by rapid resolidification

Mróz M., Orłowicz W., Tupaj M., Trytek A.

Archives of Foundry Engineering

2012

Vol. 12, iss. 4

117-120

This study presents results of stress rupture test of MAR-M-509 cobalt alloy samples, as-cast and after surface refining with a concentrated stream of heat. Tests were conducted on samples of MAR-M-509 alloy castings, obtained using the lost-wax method. Casting structure refining was performed with the GTAW method in argon atmosphere, using the current I = 200 A and electrical arc scanning velocity vs = 100, 150, 200 and 250 mm/min. The effect of rapid resolidification of the MAR-M-509 alloy on the microstructure was examined and significant improvement in stress rupture test was observed.