Multi-Phase Cr-Based Alloys for Aggressive High Temperature Environments

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The objective of this work is to develop and characterize a new family of Cr-based alloys for structural use in aggressive 900-1300 C corrosion environments. The potential advantages of Cr are high melting point, moderate density, and good high-temperature corrosion resistance in many environments [1]. However, these are currently negated by inadequate high-temperature strength, ambient-temperature brittleness, and susceptibility to environmental embrittlement at elevated-temperatures by rapid nitride subscale formation [1]. Over the course of this effort, two distinct approaches to overcoming these problems have been pursued: Cr{sub 2}Ta-reinforced Cr, and MgO-dispersed Cr. The Cr{sub 2}Ta-reinforced Cr alloys are based on the ... continued below

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6 pages

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Brady, M.:.; Liu, C.T.; Tortorelli, P.F.; Sachenko, P.; Walker, L.R.; Carmichael, C.A. et al. April 22, 2003.

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  • Oak Ridge National Laboratory
    Publisher Info: Oak Ridge National Lab., Oak Ridge, TN (United States)
    Place of Publication: Oak Ridge, Tennessee

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Description

The objective of this work is to develop and characterize a new family of Cr-based alloys for structural use in aggressive 900-1300 C corrosion environments. The potential advantages of Cr are high melting point, moderate density, and good high-temperature corrosion resistance in many environments [1]. However, these are currently negated by inadequate high-temperature strength, ambient-temperature brittleness, and susceptibility to environmental embrittlement at elevated-temperatures by rapid nitride subscale formation [1]. Over the course of this effort, two distinct approaches to overcoming these problems have been pursued: Cr{sub 2}Ta-reinforced Cr, and MgO-dispersed Cr. The Cr{sub 2}Ta-reinforced Cr alloys are based on the Cr-Cr{sub 2}Ta eutectic structure and contain a Cr solid solution matrix phase reinforced with lamellar Cr{sub 2}Ta Laves phase. They exhibit an attractive combination of high-temperature strength (tensile fracture strengths of 340-550 MPa at 1200 C), high-temperature ductility (15-40% tensile elongation above 1000 C), creep resistance (creep rupture life in excess of 1000 hours at 138 MPa loading at 1000 C in air), and oxidation resistance (comparable to that of commercial chromia-forming alloys in 1100 C, 1000 h cyclic oxidation screenings in air) [2]. However, no room-temperature ductility has been achieved and extensive microalloying and microstructural control efforts have 1ed to only modest room-temperature fracture toughness of 12-14 MPa {radical}m.

Physical Description

6 pages

Notes

OSTI as DE00835703

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  • 17th Annual Conference on Fossil Energy Materials, Baltimore, MD (US), 04/22/2003--04/24/2003

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  • Report No.: none
  • Office of Scientific & Technical Information Report Number: 835703
  • Archival Resource Key: ark:/67531/metadc783273

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  • April 22, 2003

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 8, 2016, 4:05 p.m.

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Brady, M.:.; Liu, C.T.; Tortorelli, P.F.; Sachenko, P.; Walker, L.R.; Carmichael, C.A. et al. Multi-Phase Cr-Based Alloys for Aggressive High Temperature Environments, article, April 22, 2003; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc783273/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.