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US 12,152,295 B2Granted
Precipitation strengthened carburizable and nitridable steel alloys
AssigneeQuesTek Innovations LLC
InventorsJiadong Gong, Ida Berglund, Amit Behera, Greg Olson
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Abstract
Materials, methods and techniques relate to steel alloys. In some instances, steel alloys can include chromium, molybdenum, vanadium, copper, nickel, manganese, niobium, aluminum, and iron. In some instances, exemplary steel alloys are subjected to solution carburizing, tempering, and/or plasma nitriding. Exemplary steel alloys are typically precipitation strengthened carburizable and nitridable steel alloys.
Claims19
An alloy comprising, by weight percentage:
- 3.2% to 8.0% chromium;
- 0.02% to 3.0% molybdenum;
- 0.4% to 1.0% vanadium;
- 1.5% to 2.5% copper;
- 0.5% to 2% nickel;
- 0.2% to 0.4% manganese;
- 0.01% to 0.05% niobium;
- 0.1% to 1.0% aluminum;
- less than 0.01% silicon;
- less than 0.01% sulfur;
- and
- the balance iron and incidental elements and impurities,
- wherein the alloy has been solution carburized at 1000° C. to 1100° C. for 1 hour to 8 hours and wherein the alloy includes a case portion and a core portion;
- wherein the case portion includes 0.3-0.5 wt % carbon or 0.6-0.8 wt % carbon;
- wherein the core portion includes 0.1-0.2 wt % carbon;
- and
- wherein an alloy microstructure is primarily martensitic.
14 more elements
A method for making an alloy, the method comprising:
- preparing a melt, comprising, by weight percentage:
- 3.2% to 8.0% chromium;
- 0.02% to 3.0% molybdenum;
- 0.4% to 1.0% vanadium;
- 1.5% to 2.5% copper;
- 0.5% to 2% nickel;
- 0.2% to 0.4% manganese;
- 0.01% to 0.05% niobium;
- 0.1% to 1.0% aluminum;
- less than 0.01% silicon;
- less than 0.01% sulfur;
- and
- the balance iron and incidental elements and impurities;
- solution carburizing the melt at a temperature of 1000° C. to 1150° C. for 1 hour to 8 hours followed by quenching;
- and
- after quenching, either plasma nitriding at 450° C. to 550° C. or tempering the alloy at 450° C. to 550° C.,
- wherein the alloy includes a case portion and a core portion;
- wherein the case portion includes 0.3-0.5 wt % carbon or 0.6-0.8 wt % carbon;
- wherein the core portion includes 0.1-0.2 wt % carbon.
16 more elements
Dependencies are inferred from the claim text.