Fracture toughness testing and toughening mechanisms of some commercial cobalt-free hardfacing alloys

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Hardfacing alloys are weld deposited to provide a wear resistant surface for structural base materials. Commercial low cobalt hardfacing alloys are being evaluated to reduce plant activation levels. Since hardfacing alloys typically must be resistant to cracking to assure adequate in service performance, fracture toughness is a critical material property. Fracture toughness (K{sub IC}) measurements of Fe base, Ni-base, and Co-base hardfacing were performed in accordance with ASTM E399-90 procedure in an effort to identify a tough cobalt-free alternative. Reduced scatter in K{sub IC} data was observed for the Fe base hardfacing, and the 95% lower bound K{sub IC} values ... continued below

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19 pages

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Cockeram, B.V. April 27, 1998.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

Hardfacing alloys are weld deposited to provide a wear resistant surface for structural base materials. Commercial low cobalt hardfacing alloys are being evaluated to reduce plant activation levels. Since hardfacing alloys typically must be resistant to cracking to assure adequate in service performance, fracture toughness is a critical material property. Fracture toughness (K{sub IC}) measurements of Fe base, Ni-base, and Co-base hardfacing were performed in accordance with ASTM E399-90 procedure in an effort to identify a tough cobalt-free alternative. Reduced scatter in K{sub IC} data was observed for the Fe base hardfacing, and the 95% lower bound K{sub IC} values were generally higher than the Ni-base Hardfacing alloys. Preliminary crack growth data obtained during precracking indicate that the Ni-base hardfacing possess better fatigue crack growth resistance. However, none of the Fe-base or Ni-base hardfacing have K{sub IC} values that are comparable to the reference Co-base hard facing. The test specimens were machined from thick (0.5 inches) weld deposits, and the microstructures of the test specimens are compared with the more prototypic, thinner deposits. Microstructural and fractographic examinations are used to characterize the fracture mechanisms and delineate the operative toughening mechanisms. Crack deflection and crack bridging toughening mechanisms are shown to be relevant for most of the commercial hardfacing.

Physical Description

19 pages

Notes

INIS; OSTI as DE00654147

Source

  • American Vacuum Society conference on thin solid films (TSF) and surface and coatings technology (SCT), San Diego, CA (US), 04/27/1998--05/01/1998; Other Information: Supercedes report DE98004680; PBD: 27 Apr 1998

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  • Other: DE98004680
  • Report No.: WAPD-T--3177
  • Report No.: CONF-980429--
  • Grant Number: AC11-93PN38195
  • Office of Scientific & Technical Information Report Number: 654147
  • Archival Resource Key: ark:/67531/metadc712208

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  • April 27, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 6:27 p.m.

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Cockeram, B.V. Fracture toughness testing and toughening mechanisms of some commercial cobalt-free hardfacing alloys, article, April 27, 1998; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc712208/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.