[15P-T3-01] Dynamic Densification of Ni-Based ODS Alloy Using Progressive Liquid Sintering
Keywords:Ni based ODS powder, Progressive Liquid phase Sintering, Pore behavior, High-temperature mechanical properties, Microstructure
Oxide Dispersion Strengthened (ODS) superalloys, currently commercialized as Ni-based and Fe-based alloys, enhance high-temperature mechanical properties by incorporating oxide particles into the metal matrix. Metal powder compacts inevitably contain pores during their manufacturing and processing. The existence of pores within the consolidated parts leads to the decrease in density, deterioration of mechanical and electrical properties, and reduced corrosion resistance. While numerous pore elimination processes exist for densifying metal compacts, most of them involve high pressure treatment in the solid state resulting to incomplete densification. Alternatively, liquid-phase sintering processes at elevated temperatures offer higher densification potential than solid-state sintering, but they suffer from lengthy processing times. In this study, we intend to introduce the Progressive Liquid phase Sintering (PLS) process which achieve fully densification under the temperature of partial solid/liquid coexistence. This excellent results are achieved to control the movement speed of solidified zone and solid/liquid interfaces into solid/liquid coexistence zone. The high-temperature characteristics of Ni-based ODS alloy were investigated with parts various process parameters (temperature, time, and movement speed) during PLS. Consequently, Ni-based ODS alloy parts with reduced porosity and enhanced its high-temperature mechanical properties were optimized.