Ati Properties, Inc.

Christopher D Rock

Robin M Forbes Jones

An alloy is disclosed comprising up to 0.05 weight percent carbon, 27.0 to 31.0 weight percent chromium, up to 0.5 weight percent copper, 7.0 to 11.0 weight percent iron, up to 0.5 weight percent manganese, up to 0.015 weight percent sulfur, up to 0.5 weight percent silicon, at least 58 weight percent nickel, and incidental impurities, wherein the alloy exhibits an ASTM grain size of 3.0 to 9.0, exhibits a uniform grain size distribution, includes intergranular MCcarbide precipitates uniformly distributed on grain boundaries, and includes minimal or no intragranular MCcarbide precipitates. Articles of manufacture including the alloy also are described.

Nickel-base alloy and articles

A thermo-mechanical treatment process is disclosed. A nickel-base alloy workpiece is heated in a first heating step to a temperature greater than the MCcarbide solvus temperature of the nickel-base alloy. The nickel-base alloy workpiece is worked in a first working step to a reduction in area of 20% to 70%. The nickel-base alloy workpiece is at a temperature greater than the MCcarbide solvus temperature when the first working step begins. The nickel-base alloy workpiece is heated in a second working step to a temperature greater than 1700&#xb0; F. (926&#xb0; C.) and less than the MCcarbide solvus temperature of the nickel-base alloy. The nickel-base alloy workpiece is not permitted to cool to ambient temperature between completion of the first working step and the beginning of the second heating step. The nickel-base alloy workpiece is worked to a second reduction in area of 20% to 70%. The nickel-base alloy workpiece is at a temperature greater than 1700&#xb0; F. (926&#xb0; C.) and less than the MCcarbide solvus temperature of the nickel-base alloy when the second working step begins.

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Monroe, NC, United States of America

Christopher D Rock