Title: Corrosion and creep resistant high Cr FeCrAl alloys

Abstract

An alloy includes in weight % based upon the total weight of the alloy: 28-35% Cr; 2.5-4% Al; 0.8-2% Nb; 5.5-7.5% W; 0-0.5% Mo; 0-0.3% Ti; 0.1-0.3% Zr; 0.1-1% Si; 0-0.07% Y; 0-2% Mn; 0-1% Ni; 0-0.05% C; 0-0.015% B; 0-0.02% N; 0.02-0.04 Ce; balance Fe. The alloy includes a recrystallized, equi-axed grain structure, and forms an external alumina scale, and has strengthening particles including Fe2M (M: Nb, W, Mo, and Ti) type C14 Laves-phase, and a BCC ferritic matrix microstructure from room temperature to melting point with less than 1% FCC-phase, less than 1% martensite phase, less than 0.5 wt. % of carbides (MC and M23C6), and at least 1% tensile elongation at room temperature. The alloy provides a creep resistance of greater than 3000 to 15000 h creep rupture life at 750° C. and 50 MPa, or greater than 500 to 5000 h creep rupture life at 700° C. and 100 MPa.

Inventors:

Yamamoto, Yukinori; Pint, Bruce A.; Brady, Michael P.

Issue Date:

Tue Jan 05 00:00:00 EST 2021

Research Org.:

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1805351

Patent Number(s):

10883160

Application Number:

16/283,359

Assignee:

UT-Battelle, LLC (Oak Ridge, TN)

Patent Classifications (CPCs):

C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS

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C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

C21D2211/005 - Ferrite
C21D8/0205 - {of ferrous alloys}
C21D8/0226 - {Hot rolling}
C21D8/0263 - {following hot rolling}
C21D8/0273 - {Final recrystallisation annealing}

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS

C22C38/001 - {containing N}
C22C38/005 - {containing rare earths, i.e. Sc, Y, Lanthanides}
C22C38/02 - containing silicon
C22C38/04 - containing manganese
C22C38/06 - containing aluminium
C22C38/44 - with molybdenum or tungsten
C22C38/48 - with niobium or tantalum
C22C38/50 - with titanium or zirconium
C22C38/54 - with boron

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DOE Contract Number:  

AC05-00OR22725

Resource Type:

Patent

Resource Relation:

Patent File Date: 02/22/2019

Country of Publication:

United States

Language:

English