Quenched Structure and Tempering Process of Iron-Nitrogen Binary Alloys

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Iron-nitrogen binary alloys were prepared by nitriding pure iron plates 0.15 mm in thickness with mixed gas of ammonia and hydrogen. The quenched and the tempered structures of these alloys were examined. The martensite in iron-high nitrogen alloy appeared in a lenticular form with a mid-rib, and its habit plane was approximately {124}_γ or {259}_γ plane. By means of transmission electron microscopy, a great many micro-stripes were observed in the martensite. These results were all similar to those obtained with iron-high carbon alloy. In iron-nitrogen alloys, when the martensite was tempered at various temperatures for 1 hour, Fe_<16>N_2 (α"-phase) precipitated at 150℃ and was replaced by Fe_4N (γ'-phase) above 200℃, while no precipitate was detected below 200℃ in aging the austenite and Fe_4N was detected above this temperature.
東北大学の論文