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Stress-rupture Tests of MAR-M-509 Cobalt Alloy Improved by Rapid Solidification

Mróz M., Orłowicz W., Tupaj M.

Archives of Foundry Engineering

2013

Vol. 13, iss. 1 spec.

117--120

In the paper, results of stress-rupture test applied to MAR-M-509 cobalt alloy specimens, in as-cast condition and with microstructure shaped under rapid solidification conditions are presented. The material for the study were castings of MAR-M509 alloy obtained by means of the investment casting method. The rapid solidification conditions were obtained by means of remelting process carried out with the use of GTAW method. The effect of rapid solidification following the remelting process is a refinement of microstructure in castings of MAR-M509 alloy and significant extension of the time to rupture in stress-rupture test.

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.