Effects of Microstructure, Composition, and Strength on the Nil Ductility Transition (NDT) Temperature of HY-80 Steel
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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Steel from 22 heats of low-carbon Ni-Cr-Mo steel, HY-80 ASTM a543-65, and MIL-S-16216G Ships was heat treated to study the effects on the drop weight nil ductility transition NDT temperature of 1 commercial variation in composition and inclusion content, 2 variation in microstructure such as prior austenitic grain size and the relative amount of isothermally produced ferrite or bainite in a tempered martensitic matrix, and 3 the observed variation in strength obtained after a one-hour 1150 deg F temper followed by water quench to prevent embrittlement while cooling from the tempering temperature.
- Properties of Metals and Alloys