Optimization of Densification Process and Microstructure of Cold Isostatic Pressed (CIP) 18Cr-ODS Ferritic Steel Powder

This study examines how 18Cr ODS ferritic steel behaves during sintering under different conditions, like temperatures from 1050 ºC to 1250 ºC and atmospheres of Air, Hydrogen, and Argon. It assesses density, microstructure, and microhardness of the sintered samples to understand the effects of these factors on material properties. Results show that sintering in a Hydrogen atmosphere consistently produces the highest density, thanks to its ability to prevent oxidation and reduce oxide layers on powder particles. Density increases with temperature until 1150 ºC, after which grain coarsening becomes more prominent. The optimal conditions for compaction (92% density) and a uniform microstructure were achieved at 1150 ºC for 2 h in a Hydrogen atmosphere. Overall, this study offers valuable insights into optimizing sintering parameters for 18Cr ODS ferritic steel, with potential benefits for enhancing material properties and performance in various applications.