Heat treatment process for material bodies made of a high-temper

Details Heat treatment process for material bodies made of a high-temper Heat treatment process for material bodies made of a high-temper

1997-10-22

2000-11-14

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148607, 148677, C22F 116

Patent

active

061464783

ABSTRACT:
A heat treatment process for material bodies made of a high-temperature-resistant iron-nickel superalloy of the type IN 706 comprises the following steps: solution annealing at approximately 965 to 995.degree. C. for 5 to 20 hours, stabilization annealing at approximately 775 to 835.degree. C. for 5 to 100 hours, and precipitation hardening at 715 to 745.degree. C. for 10 to 50 hours and at 595 to 625.degree. C. for 10 to 50 hours. A heat-treated material body of this kind, made of a high-temperature-resistant iron-nickel superalloy of the type IN 706 exhibits a crack growth rate of less than 0.05 mm/h and/or exhibits a minimum elongation of 2.5% without cracks at a constant strain rate of 0.05%/h and a temperature of 600.degree. C.

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"Heat Treatment of 706 Alloy for Optimum 1200.degree.F Stress-Rupture Properties", Moll, et al., Metallurgical Transactions, vol. 2, Aug. 1971, p. 2153-2160.

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