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Abstract
The effects were studied of argon contamination in PM MERL 76 hot isostatically pressed at 103·4 MPa (15 ksi) and 193·1 MPa (28 ksi). Microstructures were characterized and mechanical properties at 704°C (1300°F) were determined for material containing 59 ppm argon (by weight) in the powder container. Baseline hipped PM MERL 76 was also evaluated. The argon contamination resulted in a significant level of porosity in the final material. Contaminated PM MERL 76 hipped at 103·4 MPa (15 ksi) was 97·6% dense, and that hipped at 193·1 MPa (28 ksi) was 98·7% dense, in both cases after heat treatment. Porosity due to argon adversely affected the notch stress rupture life and tensile properties of the alloy. The creep crack growth resistance was only slightly degraded by argon contamination and the resultant distributed pores. PM/0290