Observations on the iron-nitrogen system

Abstract

By means of thermal analyses, microscopic examinations, and X-ray analyses of nitrided electrolytic iron specimens a study has been made of the iron-nitrogen system. From the data obtained and with the diagrams of Sawyer and Fry as a basis, a modified iron-nitrogen constitution diagram has been tentatively drawn. The upper temperature horizontal noted by Sawyer was also observed, but this has been ascribed to a peritectoid instead of a eutectoid transformation.