On the γ\ ightleftarrowsβ+γ′+θ in Fe-C-N System in Cyaniding or Carbo-Nitriding Cases. (Fundamental Study on Cyaniding and Carbonitriding, 6th Report)

Abstract

Applying the tests of differential thermal dilatation, X-ray diffraction, micro-Vicker’s hardness, and micro-structure to the specimens which were cyanided or carbonitrided under various conditions and had variety of carbon and nitrogen concentrations in the cases, the studies were carried out to confirm existence of Fe-C-N ternary eutectoid transformation γ\ ightleftarrowsα+γ′+θ. It was ascertained that the ternary eutectoid temperature is about 540°C during heating.