Nitriding of Fe–18Cr–11Mn powders using mechanical alloying method through aerating nitrogen circularly

Abstract

Mechanical alloying (MA) method was applied to nitride Fe–18Cr–11Mn stainless steel powders through aerating nitrogen circularly. Both the MA process and increasing nitrogen pressure circularly caused the expansion of nitrogen solubility in Fe. The microstructure of powders was affected by the milling time. The phase transformation of α-Fe to γ-Fe occurred during the MA process. The grain size of powder decreased, while the internal lattice strain increased by increasing the milling time and cycles of aerating nitrogen. The as-milled powder could obtain a fully austenitic structure after sintering and subsequent water quenching. The sintered samples had better density and higher microhardness when the powders milled for more time. The formation mechanism of nitriding of stainless steel powders using MA method in nitrogen was presented.

Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying

“…Especially for the restoring of large components, a possible cost benefit can be achieved by omitting the additional step.A new approach for the enhancement of coating properties is the direct thermochemical treatment of the thermal-spraying feedstock. Different approaches for the nitriding of steel powder have been investigated [13,14]. However, no successful formation of an S-phase in austenitic steel powder has been achieved yet.…”

Cold Gas Spraying of Solution-Hardened 316L Grade Stainless Steel Powder

“…For large components, an economical opportunity for partial or complete coating can be developed. Various approaches to nitride steel powder have been investigated [13,14]. Lindner et al successfully demonstrated S-phase formation in austenitic steel powder.…”

Wear and Corrosion Behavior of Cold Gas Sprayed Stainless-Steel Coatings Using Solution-Hardened AISI 316L Powder

“…An alternative approach for the treatment of components is the solution hardening of feedstock materials for the coating process. Various approaches to nitride steel powder have been investigated [13,14]. Lindner et al successfully demonstrated S-phase formation in austenitic steel powder.…”