Influence of nitrogen uptake and heat treatment on the microstructural characteristics and corrosion performance of X190CrVMo20?4?1 steel produced by supersolidus liquid?phase sintering

Martensitic stainless steel powder exhibits a high nitrogen uptake when densified by supersolidus liquid-phase sintering in atmosphere, but the optimum uptake, which is beneficial to its resistance corrosion, unknown. In this study, of high-carbon martensitic X190CrVMo20-4-1 atmosphere against pitting corrosion was explored. This clarify impact matrix quenched and tempered condition on an aqueous solution. Samples were subjected potentiodynamic polarisation tests de-aerated, 1 wt% NaCl Results revealed that X190 at 40-kPa pressure, deep cryogenic treatment liquid austenitising temperature 1150°C 200°C, had best with breakdown potential 142 ± 11 mV/SCE hardness 738 4 HV10. The around M7C3 carbides MX carbonitrides suffered susceptibility. implications study serve as basis for improvement functional properties steels.