Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2008-09-22
2010-11-16
Yee, Deborah (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S618000, C148S321000, C420S027000
Reexamination Certificate
active
07833362
ABSTRACT:
A method by which high temperature properties of a ductile iron alloy, including creep and LCF properties, can be increased for pressure-containing components that are subject to creep and low cycle fatigue. The method comprises modifying the ductile iron alloy to contain 0.4 to 0.8 weight percent molybdenum. A casting of the modified ductile iron alloy is produced and then annealed at a temperature of at least 725° C. for not less than five hours to eliminate carbides and/or stabilize pearlite in the casting. The annealed casting of the modified ductile iron alloy exhibits improved creep resistance and low cycle fatigue properties in comparison to an identical casting of a ductile iron alloy that does not contain molybdenum.
REFERENCES:
patent: 2809888 (1957-10-01), Eash et al.
patent: 60-29420 (1985-02-01), None
English-hand translation of Japanese patent 60-29420, Shiro Nakamura et al., Feb. 14, 1985.
Brown Mark Roger
Tipton Thomas Robbins
Xu Liming
General Electric Company
Hartman Domenica N. S.
Hartman Gary M.
Hartman & Hartman P.C.
Yee Deborah
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