Plasma hardening of high-chromium-alloy steel containing distributed titanium carbide

Abstract
Plasma nitriding of steel-bonded carbides was investigated to determine if this process hardens the material. It is found that the nitriding and hardening occur only in the tool steel matrix by the formation of the compounds Fe3N-Fe2N, γ′-Fe4N, and Fe3N, and it is hardened to 1500 Knoop. A case depth of 0.15 mm (0.006 in.) is developed in 6 h at a temperature of 600 °C. Conventional heat treatment through hardens the material to 900 Knoop, compared to 700 Knoop as received.
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