Abstract
During the production of high-chromium steel powders in a dissociated ammonia atmosphere the powders undergo nitriding. To obtain powders of negligible nitrogen content, heating during diffusional impregnation should be performed at the highest rate; with an incompletely gas-tight liquid seal, the nitrogen concentration in the powder sharply rises, particularly at low cooling rates. The compressibility of high-chromium steel powders produced by diffusional impregnation in a dissociated ammonia atmosphere is determined by their nitrogen content and cooling rate; the effect of the latter is strongest at nitrogen contents in excess of 0.2–0.4%. High nitrogen contents and rapid cooling after diffusional impregnation have a deleterious effect on the compressibility of the powder, which is attributable to changes in the microstructure and microhardness of its particles.
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