Cr{sub 2}Nb-based alloy development

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Two-phase Cr-Cr{sub 2}Nb alloys (designated as CN alloys) were prepared by arc melting, followed by directional solidification, HIPping, or hot extrusion at 1450 to 1500C. The microstructure of CN alloys containing 6 to 12 at.% Nb depended strongly on alloying additions, heat treatment, and material processing. Tensile properties were sensitive to defects. Hot extrusion at 1480C was most effective in reducing as-cast defects and refining the cast Cr-Cr{sub 2}Nb eutectic structure and thus improving ductility. Beneficial alloying elements that modified the eutectic microstructure, improved oxidation resistance, or increased high-temperature strength were identified. One particular composition had a room-temperature fracture strength ... continued below

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13 p.

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Liu, C.T.; Tortorelli, P.F.; Horton, J.A.; Easton, D.S.; Schneibel, J.H.; Heatherly, L. et al. July 1, 1995.

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Two-phase Cr-Cr{sub 2}Nb alloys (designated as CN alloys) were prepared by arc melting, followed by directional solidification, HIPping, or hot extrusion at 1450 to 1500C. The microstructure of CN alloys containing 6 to 12 at.% Nb depended strongly on alloying additions, heat treatment, and material processing. Tensile properties were sensitive to defects. Hot extrusion at 1480C was most effective in reducing as-cast defects and refining the cast Cr-Cr{sub 2}Nb eutectic structure and thus improving ductility. Beneficial alloying elements that modified the eutectic microstructure, improved oxidation resistance, or increased high-temperature strength were identified. One particular composition had a room-temperature fracture strength of 548 MPa and an ultimate tensile strength of 388 MPa, and 23% elongation at 1200C. Another CN alloy showed a fracture toughness of 7.6 MPa{radical}m at room temperature and 24.4 MPa{radical}m at 1100C. Silicide coatings applied by a pack cementation process substantially improved the oxidation resistance of the Cr-Cr{sub 2}Nb alloys at 950 and 1100C.

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13 p.

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OSTI as DE95014583

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  • 9. annual conference on fossil energy materials, Oak Ridge, TN (United States), 16-18 May 1995

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  • Other: DE95014583
  • Report No.: CONF-9505204--7
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 95317
  • Archival Resource Key: ark:/67531/metadc792095

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  • July 1, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 19, 2016, 12:10 p.m.

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Liu, C.T.; Tortorelli, P.F.; Horton, J.A.; Easton, D.S.; Schneibel, J.H.; Heatherly, L. et al. Cr{sub 2}Nb-based alloy development, article, July 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc792095/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.