[T8] MIM - Stainless Steel and Heat Resistant Alloy

[15D-T8-09] Microstructure and High Temperature Mechanical Properties of IN718 Fabricated by Metal Injection Molding

*H. Suzuki¹, N. Palleda¹, H. Okuyama², K. Kakehi¹ (1.Tokyo Metropolitan University, Japan, 2.Micro MIM Japan, Japan)

キーワード：Metal Injection Molding, Nickel-based superalloy, Mechanical properties at high temperature

Metal injection molding (MIM) is a manufacturing process that combines plastic injection molding and powdered metallurgy. It is expected to be used in industries, such as aerospace, medical devices, and automotive for producing complex three-dimensional components with high precision. In this study, we fabricated MIM materials by using IN718 atomized powder and solution treatment and aging (STA). Then, the mechanical properties at a high temperature and the microstructure were investigated and compared with SLM (selective laser melting) specimen. Tensile testshowed that the UTS of MIM specimen was lower than that of SLM specimen, while the creep test indicated that the MIM specimen had longer creep life than life that of SLM specimen. As a result of EDS analysis, carbides including Mo and Nb with a coreof Al2O3 were observed. In MIM specimen, δ-phase precipitation was not observed. It is considered that the formation of Al2O3 by oxygen contamination and the formation of Mo-and-Nb-rich carbides suppressed the Nb-rich precipitation of γ'' and δ phases, which affected the strength properties.