[16P-T10-03] Impact of Sintering Parameters on Sintering Densification and Mechanical Properties of High-Performance Powder Metallurgy (HPM) 17-4PH Compacts
キーワード:17-4PH, high-performance powder metallurgy (HPM), sintering parameter, phase diagram, mechanical properties
Traditional press-and-sinter (PS) processes often use coarse 17-4PH stainless steel powders, resulting in low sintered density and poor mechanical properties. To address these issues, we developed a High performance Powder Metallurgy (HPM) process Using fine 17-4PH powders commonly used in metal injection molding (MIM) into PS process. Experimental results of sintering temperatures revealed that temperatures exceeding 1260°C induce δ-phase formation, enhancing diffusion rates, promoting pore spheroidization, and inhibiting grain coarsening. Sintering at 1320°C for an hour in H2 atmosphere yielded high-density (7.4 g/cm³) 17-4PH components with excellent mechanical properties (tensile strength approximately 1000 MPa, HRC 34 hardness, ~8% elongation). Temperatures exceeding 1360°C resulted in liquid phase formation, uneven alloy distribution, and grain coarsening. Our study underscores the cost-effective HPM process's ability to achieve mechanical properties comparable to MIM, enhancing competitive advantage in powder metallurgy technology.