Thermomechanical processing of nickel based alloys

摘要

A process comprising: a first heating stage of heating a nickel-based alloy workpiece comprising, by weight, up to 0.05% carbon, from 27.0% to 31.0% chromium, up to 0.5% copper, 7.0% to 11.0% iron, up to 0.5% manganese, up to 0.015% sulfur, up to 0.5% silicon, at least 58% nickel and secondary impurities, up to a temperature higher than the solvus temperature of the M23C6 carbide of the nickel-based alloy; a first work stage comprising working the heated nickel-based alloy workpiece to a 20% to 70% reduction in area, where the nickel-based alloy workpiece is at a temperature higher than the solvus temperature of the M23C6 carbide when the first stage of work begins; a second heating stage comprising heating the nickel-based alloy workpiece to a temperature greater than 927 ° C (1,700 ° F) and lower than the solvus temperature of the M23C6 carbide of the nickel-based alloy, where the part The work of alloy based on worked nickel is maintained at elevated temperature and is not allowed to cool to room temperature between the end of the first working stage and the beginning of the second heating stage; and a second work stage comprising working the heated nickel-based alloy workpiece for a second reduction in area from 20% to 70%, where the nickel-based alloy workpiece is at a temperature greater than 927 ° C (1,700 ° F) and lower than the solvus temperature of the nickel-based alloy M23C6 carbide when the second work stage begins.