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US 8,603,213 B1Granted
Dispersoid reinforced alloy powder and method of making
AssigneeIowa State University Research Foundation, Inc.
InventorsIver E. Anderson, Joel Rieken
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AssigneeIowa State University Research Foundation, Inc.
InventorsIver E. Anderson, Joel Rieken
Estimating the term…
A method of making dispersion-strengthened alloy particles involves melting an alloy having a corrosion and/or oxidation resistance-imparting alloying element, a dispersoid-forming element, and a matrix metal wherein the dispersoid-forming element exhibits a greater tendency to react with an introduced reactive species than does the alloying element and wherein one or more atomizing parameters is/are modified to controllably reduce the amount of the reactive species, such as oxygen, introduced into the atomized particles so as to reduce anneal times and improve reaction (conversion) to the desired strengthening dispersoids in the matrix. The atomized alloy particles are solidified as solidified alloy particles or as a solidified deposit of alloy particles. Bodies made from the dispersion strengthened alloy particles, deposit thereof, exhibit enhanced fatigue and creep resistance and reduced wear as well as enhanced corrosion and/or oxidation resistance at high temperatures by virtue of the presence of the corrosion and/or oxidation resistance imparting alloying element in solid solution in the particle alloy matrix.
As-atomized, prealloyed particles, each comprising a matrix metal comprising iron, an environmental resistance-imparting alloying element, a dispersoid-forming element to form dispersoid particles, and a reactive species present in solid solution and/or as a compound in an amount sufficient to complete a reaction with said dispersoid-forming element to form dispersoid particles but not exceeding about 10,000 ppm by weight wherein the atomized particles each include a metastable surface compound that is formed by reaction of the reactive species with the alloying element and that is relatively less thermodynamically stable than the dispersoid particles.
A thermally sprayed deposit comprising as-atomized, prealloyed particles, each comprising a matrix metal comprising iron, an environmental resistance-imparting alloying element, a dispersoid-forming element to form dispersoid particles, and a reactive species present in solid solution and/or as a compound in an amount sufficient to complete a reaction with said dispersoid-forming element to form dispersoid particles but not exceeding about 10,000 ppm by weight, wherein the atomized particles each include a metastable surface compound that is formed by reaction of the reactive species with the alloying element and that is relatively less thermodynamically stable than the dispersoid particles, wherein the particles are deposited as overlying splats that solidify on a mandrel.
Atomized alloy particles, each comprising a matrix metal comprising iron, an environmental resistance-imparting alloying element, a dispersoid-forming element to form dispersoid particles, and a reactive species present in solid solution and/or as a compound in an amount sufficient to complete a reaction with said dispersoid-forming element to form dispersoid particles but not exceeding about 4,000 ppm by weight.
Atomized alloy particles, each comprising a matrix metal comprising iron, an environmental resistance-imparting alloying element, a dispersoid-forming element to form dispersoid particles, and a reactive species present in solid solution and/or as a compound in an amount sufficient to complete a reaction with said dispersoid-forming element to form dispersoid particles but not exceeding about 2,000 ppm by weight.
Dependencies are inferred from the claim text.