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Powder injection molding (PIM) is an emerging technology for manufacturing gas turbine engine components. To evaluate superalloy alloy 718 for these applications, mechanical testing specimens were produced by PIM and sintered at various heating rates in a partial pressure of argon. Alloy 718 is difficult to process because a low melting point eutectic-Laves phase develops during the sintering process. The Laves phase prevents full densilication and decreases the tensile properties. Heating ramp rates up to lS”C/min and a holding time of 6 hours prevented the formation of Laves phase during sintering. In the as-sintered condition, 99% of the theoretical density was achieved. After HIP and heat treatment, the tensile properties at room temperature and 650°C exceeded the minimum property requirements, while stress rupture time, high cycle fatigue, and creep properties met typical aerospace properties. Stress rupture elongation life was met with an additional delta heat treatment. This work was conducted by the National Center for Excellence in Metalworking Technology, operated by Concurrent Technologies Corporation under contract No. N00140-92-C-BC49 to the U.S. Navy as part of the U.S. Navy Manufacturing and Technology Program Superalloys 718, 625, 706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals &Materials Society, 1997

Sintering Effect on the Microstructure and Mechanical Properties of Alloy 718 Processed by Powder Injection Molding