Abstract
Nitrogen absorption processing was applied to a low-carbon steel and Mn-Si-C steel, to study the basic mechanism of recently developed nitriding-quenching treatment. We changed N_2+NH_3 gas pressure ratio for nitrogen absorption processing. The results of SEM/EBSD revealed that the cross section of the treated sample exhibits three layers: from the surface: the first layer (about 10μm) consists of nitride and the retained austenite, the second layer (30μm) martensite and austenite and then the ferrite matrix. The retained austenite is much stable in the Si-Mn-C steel than in the low carbon steel..
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