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Vol.12, No.1, 3 ~ 8, 1974
Title
Study on the Compound Layer of Mild Steel Gaseous Nitrocarburized
이상윤 S . Y . Lee
Abstract
The gaseous nitrocarburizing treatment involves the simultaneous nitriding and carburizing at 570℃ in an atmosphere of 50% ammonia and 50% endothermic gas for a period of three hours followed by oil quenching. The treatment produces a compact compound layer 18μ thick on the surface of mild steel. X-ray structural analysis has revealed that this layer consists mainly of the C. P. H. epsilon carbonitride phase together with some Fe₄N and free ferrite chemical analysis has been used to show that C/N ratio in the layer is 0.21 and that it contains a total interstitial content of 29.5 atomic percent, which is close to the lower limit of the ε-carbonitride phase field.
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