Abstract
Low Cr steels AISI 4140, AISI 4340, and high Cr austenitic stainless steels AISI 304. AISI 316 were ion nitrided in a dc glow discharge plasma consisting of a 75% H2–25% N2 mixture. Surface compound layer phases were identified, and compound layer microhardness and diffusion zone microhardness profiles were established. Distinct differences in surface compound layer hardness and diffusion zone profiles were determined between the low and high Cr alloy steels. The high Cr stainless steels after ion nitriding displayed a hard compound layer and an abrupt diffusion zone. The compound layers of the high Cr stainless steels had a columnar structure which accounts for brittleness when layers are exposed to contact stresses. The ion nitrided surfaces of high and low Cr steels displayed a low coefficient of friction with respect to the untreated surfaces when examined in a pin and disk tribotester.
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More From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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