Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1989-06-09
1991-09-10
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148410, C21D 119
Patent
active
050470930
ABSTRACT:
A method of increasing intergranular stress corrosion cracking resistance of Alloy 718 in water reactor environments is disclosed. The Alloy is heat treated at a high annealing temperature to dissolve .delta. precipitates. The absence of .delta. particles at the grain boundaries increases the elemental homogeneity at the boundaries and increases intergranular stress corrosion cracking resistance. In addition, the absence of .delta. phase at the grain boundaries decreases the crack propagation rate.
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James, L. A. and Mills, W. J., "Effect of Heat Treatment and Heat-to-Heat Variations in the Fatigue Crack Growth Response of Alloy 718", Hanford Engineering Development Laboratory, HEDL-TME 80-9, UC-79, b, h, Apr. 1980, Part 1 & HEDL-TME 80-10, UC-79, b, h, Part 2.
Mills, W. J., "Effect of Heat Treatment on the Tensile and Fracture Toughness Behavior of Alloy 718 Weldments", Supp. to the Welding Journal, Aug. 1984, pp. 237s-245s.
Korth, Gary, "Mechanical Properties Test Data of Alloy 718 for Liquid Metal Fast Breeder Reactor Applications", Dept. of Energy, DOE Contract No. DE-AC07-761D01570, Jan. 1983.
Smolik, G. R. and Korth, G. E., "Reference Heat of Alloy 718 for Department of Energy Programs", Report TREE-1253, EG & G Idaho Inc., Apr. 1978.
Kimmmerle, W. L., Miglin, M. T., and J. L. Nelson, "Stress Corrosion Cracking of Alloy 718 in Pressurized-Water-Reactor Primary Water", Superalloy 718, ed. E. A. Loria, AIME, presented at International Symposium of Superalloy 718, Pittsburgh, Pa., Jun. 11-14, 1989.
Miglin, M. T. and Nelson, J. L., Strain Rate Sensitivity of Alloy 718 Stress Corrosion Cracking, Fontevraud II Conference Proceedings, Chinon, France, Sep. 10-14, 1990.
Kimmerle William L.
Miglin Marie T.
Dean R.
Edwards Robert J.
Kalka Daniel S.
Matas Vytas R.
Phipps Margery S.
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