Transcription of Phase Transformations in Nickel-Base Superalloys
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Phase Transformations in Nickel-Base Superalloys
Phase Transformations IN Nickel-Base Superalloys J. R. Mihalisin and D. L. Pasquine Abstract A study has been made of the Phase Transformations that occur during long time rupture testing of IN-731X, an alloy specifically designed for Phase stability. No sigma, formation was observed in this alloy. The beneficial effect of heat treatment in inhibit- ing sigma formation and the anomalous effect of heat treat- ment on the rupture properties of alloy 713C and alloy 71 JLC have been correlated with microstructural alterations induced by heat treatment. A method for electron vacancy calculation has been devised which incorporates the actual y' chemistry obtained by preferential extraction techniques and chemical analysis. I This method is used to show that long time rupture testing and heat treatment have little effect on electron vacancy number. J. R. Mihalisin and D. L. Pasquine are with The International nickel Company, Inc., Paul D.
PHASE TRANSFORMATIONS IN NICKEL-BASE SUPERALLOYS J. R. Mihalisin and D. L. Pasquine Abstract A study has been made of the phase transformations
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