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The surface microstructure and growth behavior of an Fe­0.4mass%C alloy formed by lithium-added salt-bath nitrocarburizing were investigated. The Fe­0.4mass%C alloy was prepared by arc melting and nitrocarburized by a salt-bath containing Li, Na, K, CNO, and CN at 823K from 0.1 h up to 10 h. A compound layer forms on the surface at the beginning of nitrocarburizing, and then an oxide layer forms on the compound layer after nitrocarburizing for 1.0 h. Afterwards, the thickness of both layers increase. A grain boundary oxide forms at the interfaces of columnar crystals in the compound layer. The oxide consists of LixFe11xO with an NaCl-type structure, and the growth of the oxide layer is controlled by the outward diffusion of iron in the oxide layer. Meanwhile, the compound layer consists mainly of an 3⁄4-Fe2(N,C)11y phase and a slight £ A-Fe4(N,C)1+z phase near the substrate. [doi:10.2320/matertrans.H-M2020865]

Surface Microstructure and Its Growth Behavior by Nitrocarburizing with Lithium Added Molten Salt in Fe–0.4 mass%C Alloy