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Nano-scale nitride-particle-strengthened high-temperature wrought ferritic and martensitic steels

United States Patent

April 21, 2009
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method of making a steel composition includes the steps of: a. providing a steel composition that includes up to 15% Cr, up to 3% Mo, up to 4% W, 0.05-1% V, up to 2% Si, up to 3% Mn, up to 10% Co, up to 3% Cu, up to 5% Ni, up to 0.3% C, 0.02-0.3% N, balance iron, wherein the percentages are by total weight of the composition; b. austenitizing the composition at a temperature in the range of C. to C.; c. cooling the composition of steel to a selected hot-working temperature in the range C. to C.; d. hot-working the composition at the selected hot-working temperature; e. annealing the composition for a time period of up to 10 hours at a temperature in the range of C. to C.; and f. cooling the composition to ambient temperature to transform the steel composition to martensite, bainite, ferrite, or a combination of those microstructures.
Klueh; Ronald L. (Knoxville, TN), Hashimoto; Naoyuki (Knoxville, TN), Maziasz; Philip J. (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
10/ 947,119
September 22, 2004
The United States Government has rights in this invention pursuant to contract no. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.