Method of producing dopant material for iron or nickel-base allo

Details Method of producing dopant material for iron or nickel-base allo Method of producing dopant material for iron or nickel-base allo

1977-11-22

1979-01-09

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123R, 75135, 75170, C22C 3822

Patent

active

041336801

ABSTRACT:
A dopant material, comprising metallic elements constituting alloy base metals and endogeneous high-melting-point compounds selected from the group consisting of titanium, zirconium, tantalum, hafnium and thorium nitrides, carbides, carbonitrides, borides and oxides.
The dopant material for iron- or nickel-base alloys is produced by melting a dopant base metal, whereupon the elements required for the formation of the high-melting-point compounds selected from the group consisting of titanium, zirconium, tantalum, hafnium, thorium nitrides, carbides, carbonitrides, borides and oxides, are taken in a stoichiometric ratio and introduced into the melt. These elements are introduced into the melt at a temperature exceeding that required for the formation therein of such compounds. After that the melt with the elements introduced therein is cooled at a rate of 10.sup.2 -10.sup.7 degrees per second until high-melting-point endogeneous dispersed compounds are formed in the solidified base metal.
The present invention allows the production of the dopant materials which when used for modifying makes it possible to ensure an enhancement of a total range of properties, such as high-temperature strength, thermostability, crack resistance in casings and weldings, impact toughness, corrosion and erosion resistances in various aggressive media.

REFERENCES:
patent: 3028234 (1962-04-01), Alexander
patent: 3180727 (1965-04-01), Alexander
patent: 3749569 (1973-07-01), Starr
patent: 3944416 (1976-03-01), Walter

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