Gaseous carburising of self-passivating Fe–Cr–Ni alloys in acetylene–hydrogen was investigated for temperatures up to 823 K. Acetylene–hydrogen gas mixtures allow both the activation of the surface and the subsequent carburising at a high and adjustable carburising potential. For relatively low temperatures, carbon stabilised expanded austenite develops, which has high hardness, while retaining the corrosion performance of the untreated alloy; for relatively high temperatures, Cr based carbides develop, and eventually, the material deteriorates by metal dusting corrosion.
- Expanded austenite
Christiansen, T., Hummelshøj, T. S., & Somers, M. A. J. (2011). Gaseous carburising of self-passivating Fe–Cr-Ni alloys in acetylene-hydrogen mixtures. Surface Engineering, 27(8), 602-608. https://doi.org/10.1179/1743294411Y.0000000006