Abstract
Reaction zones and growth kinetics were studied after exposing high-purity chromium and alloys containing 0.5, 3.0, and 5.0 wt pct Ti to 1 atm of nitrogen between 1000° and 1400°C. Outer layers of Cr2N and regions of internal nitridation, containing dispersed TiN particles, grew in a parabolic manner. An exact solution of Maak’s simplified analysis for internal oxidation provided calculations of nitrogen diffusion in the internal-nitride zone of each alloy. Extrapolation gave the relationshipD = 9.6 × 10-3 exp (-28,500/RT) cm2 sec-1 for nitrogen diffusion in high-purity chromium. Increasing titanium to 5.0 wt. pct gaveD = 2.5 × 10-3 exp (-24,000/RT) cm2 sec-1.
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Arnold, J.L., Hagel, W.C. The nitridation of chromium and Cr-Ti alloys. Metall Trans 3, 1471–1477 (1972). https://doi.org/10.1007/BF02643035
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DOI: https://doi.org/10.1007/BF02643035