SUITABILITY OF POWDER PROCESSED HIGH NITROGEN STAINLESS STEEL ALLOYS FOR HIGH PERFORMANCE APPLICATIONS

摘要

High nitrogen stainless steels (HNSS) are a class of materials that demonstrate an attractive combination of strength, ductility, and corrosion resistance properties. The rapid solidification that occurs during an atomized powder process may introduce additional benefits such as increased nitrogen concentrations, enhanced microstructural refinement and chemical homogeneity. A predictive model was utilized to develop a series of HNSS alloys that do not exhibit the detrimental intermetallics that are prevalent in these types of materials. The resulting reduction in quench rate sensitivity could promote the production of thicker component sections or powders that can be used for corrosion resistant thermal spray coatings. The predictive model and the property enhancements achieved through powder processing of these HNSS alloys are presented and discussed.