Metal treatment – Compositions – Heat treating
Patent
1987-01-20
1989-01-17
Dean, R.
Metal treatment
Compositions
Heat treating
148162, 148410, C22F 110
Patent
active
047986328
ABSTRACT:
The present invention is concerned with a high-strength Ni-based alloy excellent in resistance to stress corrosion cracking in high-temperature high-pressure water, characterized by consisting essentially of, in terms of weight ratio, 0.08% or less of C, 0.15% or less of Si, 0.1 to 1% of Mn, 15% or less of Fe, 20 to 30% of Cr, 3.5% or less of Ti, 2% or less of Al, 7% or less of Nb and the balance of Ni, having at least one of a .gamma.' phase and a .gamma." phase in a .gamma. base, and semicontinuously predominantly precipitating M.sub.23 C.sub.6 in grain boundaries; a method for preparing this high-strength Ni-based alloy by heating and maintaining the alloy having the identical composition at 980.degree. to 1,200.degree. C., cooling it, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.; a method for preparing the aforesaid alloy by heating and maintaining the alloy having the identical composition at 980.degree. to 1,200.degree. C., cooling it, subjecting it to a cold working at a 10% or more reduction of area, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.; and a method for preparing the aforesaid alloy by subjecting the alloy having the identical composition to a hot working at 850.degree. to 1,250.degree. C. at a draft percentage of 20% or more, heating and maintaining the alloy at 980.degree. to 1,200.degree. C., cooling it, and subjecting it once or more to an aging treatment of additionally heating and maintaining it at 550.degree. to 850.degree. C.
REFERENCES:
patent: 4652315 (1987-03-01), Igarashi et al.
Huntington Alloys, Inc., Copyright 1963 by the International Nickel Company, Inc., Now Huntington Alloys, Inc., 3rd Editional, 1977 "Inconel Alloy X-750".
Huntington, Alloys, Inc. Copyright 1968 by The International Nickel Company, Inc. 2nd Editional, 1973, "Inconel Alloy 718".
Yonezawa, et al, Effect of Heat Treatment on Street Corrosion Cracking Resistance of High Nickel Alloys in High Temperature Water.
Hosoi et al, Proceedings of the International Symposium on Environmental Degradation of Materials in Nuclear Power Systems--Water Reactors, 1983 "Relation Between Susceptibility to Stress Corrosion Cracking in High Temperature Water and Microstructure of Inconel Alloy X-750".
Okada Yasutaka
Yamaguchi Noritake
Yonezawa Toshio
Dean R.
Mitsubishi Jukogyo Kabushiki Kaisha
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