The Ac1 Range in S.A.E. 2335 Steel

THIS paper presents evidence that in 3½% nickel steel, the published temperature for the Ac1 transformation, l,275°F., represents the completion of that transformation, and that its inception occurs approximately 275°F. lower, at about l,000°F. The formation of austenite within this range, especially at the higher temperatures, and its subsequent decomposition to martensite, results in considerable impairment of the properties of the steel.
Keywords: austenite, Martensite, nickel, Pittsburgh Crucible Steel Company, solid solution, Canadian, Carbon, formation, nickel, Phase, steel, Steels, Structure, Temperature
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