Microstructure and Mecanical Properties of MM/SPS Processed TiC Dispersed SUS316L Compacts
Susumu MATSUNO, Masashi TAKAMI and Kei AMEYAMA
Abstract:Mechanical milling (MM) is one of severe plastic deformation process which enables to introduce very high strain into materials. Spark Plasma Sintering (SPS) ables to fabricate sintered compacts in a short period of time, under low pressure as well as at low temperature due to its powder surface activating effect. Combining these two processes, the MM/SPS process is applied to the powders of SUS316L, Ti and graphite. The powder was sintered by spark plasma sintering (SPS) for 3.6ks at 1376K. As the result of it, a spherical TiC containing Mo was formed, fine grain structure was observed. Fine grain structure with its grain size of 300nm composed of ƒÁ phase and spherical TiC of the size;150nm was obtained. It was confirmed that these fine TiC restrains the grain growth. The compressive strength of the sintered MM powder is much higher than that of the sintered MM powder without Ti, C. Key Words:Mechanical milling, SPS, SUS316L powder, Heat treatment, Fine grain structure, HS-PM process, TiC