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Low-cost, high-strength Fe--Ni--Cr alloys for high temperature exhaust valve application

Patent ·
OSTI ID:1379209

An Fe--Ni--Cr alloy is composed essentially of, in terms of wt. %: 2.4 to 3.7 Al, up to 1.05 Co, 14.8 to 15.9 Cr, 25 to 36 Fe, up to 1.2 Hf, up to 4 Mn, up to 0.6 Mo, up to 2.2 Nb, up to 1.05 Ta, 1.9 to 3.6 Ti, up to 0.08 W, up to 0.03 Zr, 0.18 to 0.27 C, up to 0.0015 N, balance Ni, wherein, in terms of atomic percent: 8.5.ltoreq.Al+Ti+Zr+Hf+Ta.ltoreq.11.5, 0.53.ltoreq.Al/(Al+Ti+Zr+Hf+Ta).ltoreq.0.65, and 0.16.ltoreq.Cr/(Fe+Ni+Cr+Mn).ltoreq.0.21, the alloy being essentially free of Cu, Si, and V.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
Assignee:
UT-Battelle, LLC
Patent Number(s):
9,752,468
Application Number:
14/497,550
OSTI ID:
1379209
Country of Publication:
United States
Language:
English

References (9)

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Alloys compatibility in molten salt fluorides Kurchatov Institute related experience journal October 2013
Microstructural and microchemical mechanisms controlling intergranular stress corrosion cracking in light-water-reactor systems journal October 1994
Steam Generator for Advanced Ultra Supercritical Power Plants 700C to 760C conference January 2011
High Performance Corrosion Resistance of Nickel-Based Alloys in Molten Salt Flibe journal July 2009
Electrochemical Study of Tantalum in Fluoride and Oxofluoride Melts journal January 1994
An experimental test facility to support development of the fluoride-salt-cooled high-temperature reactor journal February 2014
Corrosion of 316L Stainless Steel Alloy and Hastelloy-N Superalloy in Molten Eutectic LiF-NaF-KF Salt and Interaction with Graphite journal November 2014
Corrosion characteristics of reduced activation ferritic steel, JLF-1 (8.92Cr–2W) in molten salts Flibe and Flinak journal June 2009

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36 MATERIALS SCIENCE