Heat treatment of Alloy 718 for improved stress corrosion cracki

Details Heat treatment of Alloy 718 for improved stress corrosion cracki Heat treatment of Alloy 718 for improved stress corrosion cracki

1992-03-03

1993-09-14

Roy, Uprendra

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148677, 420410, C22F 100

Patent

active

052445151

ABSTRACT:
A method of increasing intergranular stress corrosion cracking resistance of Alloy 718 in water reactor environments is described where the alloy is heat treated at a high solution annealing temperature to dissolve grain boundary precipitates formed during thermomechanical processing. A water quenching step is advantageously employed following the high solution annealing. The alloy is then aged at two separate temperatures and finally air cooled to room temperature.

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Ian L. W. Wilson, Improved Stress Corrosion Resistance of High Strength Ni-Cr-Fe Alloys RP2181-2, EPRI contractor's meeting, Oct. 1, 1987.
Miglin et al, Effect of Heat Treatment on Stress Corrosion of Alloy 718 In PWR Primary Water, 5th Symposium, Monterey, Calif., Aug. 25-29, 1991.
M. T. Miglin and J. L. Nelson, "Strain Rate Sensitivity of Alloy 718 Stress Corrosion Cracking," TMS, Warrendale, Pa., Jun. 1991.
Copies of Overheads presented at oral presentation at an EPRI's contractors meeting on Mar. 5, 1991.

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