Tool steel materials for additive manufacturing
AssigneesMassachusetts Institute of Technology, Universität Paderborn
InventorsGregory Olson, Florian Konrad Hengsbach, Krista Biggs, Mirko Schaper
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Abstract
This steel compositions for use in additive manufacturing are disclosed. In some embodiments, a metal alloy includes a majority iron in addition to carbon, molybdenum, vanadium, and tungsten. Overall, there may be a ratio of a combined atomic percentage of molybdenum, vanadium, and tungsten relative to carbon that is between or equal to 2:1 and 5:1. Other components such as grain refiners and/or oxidation resistant materials may also be included in such an alloy.
Claims27
A metal alloy comprising:
- iron;
- carbon;
- molybdenum;
- vanadium;
- chromium;
- and
- tungsten, and wherein a ratio of a combined atomic percentage (at %) of molybdenum, vanadium, and tungsten relative to carbon within the metal alloy is between or equal to 2:1 and 5:1, and wherein an atomic percentage of the chromium is between or equal to 7 at % and 10 at %.
A metal alloy comprising:
- iron;
- carbon;
- chromium;
- and
- a transition metal selected from the group consisting of molybdenum, vanadium, and tungsten;
- wherein a ratio of a combined atomic percentage (at %) of molybdenum, vanadium, and tungsten relative to carbon within the metal alloy is between or equal to 2:1 and 5:1,
- wherein the metal alloy comprises one or more phases, the one or more phases including a first, δ-ferrite phase, and
- wherein the first, δ-ferrite phase is present in the metal alloy in a phase fraction of at least 0.85.
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An additive manufacturing method, the method comprising:
- fusing one or more portions of a metal powder deposited during the additive manufacturing method to form a component, wherein the metal powder comprises particles comprising a metal alloy, wherein the metal alloy comprises:
- iron;
- carbon;
- molybdenum;
- vanadium;
- chromium;
- and
- tungsten, and wherein a ratio of a combined atomic percentage (at %) of molybdenum, vanadium, and tungsten relative to carbon within the metal alloy is between or equal to 2:1 and 5:1, and wherein an atomic percentage of the chromium is between or equal to 7 at % and 10 at %.
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Dependencies are inferred from the claim text.