Molten salt, including nitrite/nitrate salts, is the quenching medium most commonly used in austempering and marquenching of ferrous materials. This article describes the use of molten salts in the quenching of ferrous materials. It provides information on the processing and operation of salt quenching including considerations of time, temperature, environment, and safety, as well as critical characteristics such as the composition of the quenchant, agitation, and water additions.
J.R. Keough, Salt Quenching, Steel Heat Treating Fundamentals and Processes, Vol 4A, ASM Handbook, Edited By Jon L. Dossett, George E. Totten, ASM International, 2013, p 232–237, https://doi.org/10.31399/asm.hb.v04a.a0005820
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