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TRANSFORMATIONS IN IRON-NICKEL ALLOYS,
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1963
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Unknown Venue
Materials ScienceMagnetismEngineeringCorrosionFe-ni AlloysApplied PhysicsMetallurgical InteractionAlloy DesignHot WorkingThermodynamicsTransformation MechanismsAlloy PhaseMetallurgical SystemShape ChangeMicrostructureAlloys
Abstract : Cooling curves of Fe-Ni alloys (1-10%Ni) quenched at rates up to 60 000 degC/s, reveal two transformation mechanisms: the lower-temperature mechanism is shown, by the criterion of shape change, to be martensitic. The measured M(s) temperatures do not agree with the experiments or calculations of previous investigators. In all but the 10% alloy, the higher-temperature transformation (believed to be the 'massive' transformation) occurs about 50 degC above M(s). The critical cooling rate to produce a martensitic product decreases from about 30 000 degC/s in the 1%Ni alloy to 15 000 degC/s in the 7% alloy. (Author)