Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Reexamination Certificate
2007-09-25
2007-09-25
King, Roy (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
C419S029000, C419S032000, C419S033000, C419S048000
Reexamination Certificate
active
10928119
ABSTRACT:
An oxide dispersion strengthened martensitic steel excellent in high-temperature strength having residual α-grains can be manufactured by a method comprising mixing either element powders or alloy powders and a Y2O3powder; subjecting the resulting mixed powder to mechanical alloying treatment; solidifying the resulting alloyed powder by hot extrusion; and subjecting the resulting extruded solidified material to final heat treatment involving normalizing and tempering heat treatment to thereby manufacture an oxide dispersion strengthened martensitic steel in which Y2O3particles are dispersed in the steel, wherein αto γtransformation is not allowed to occur during the described hot extrusion and the proportion of residual α-grains in which oxide particles are finely dispersed in high density is increased by controlling the mixture ratio of the powders for the mechanical alloying treatment.
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Fujiwara Masayuki
Kaito Takeji
Narita Takeshi
Ohtsuka Satoshi
Ukai Shigeharu
Japan Nuclear Cycle Development Institute
Kessler Christopher
King Roy
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