Factors Affecting the Hydrogen Embrittlement Resistance of Ni-Cr-Mn-Nb Welds

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Nickel based alloys are often welded with argon/hydrogen shielding gas mixtures to minimize oxidation and improve weld quality. However, shielding gas mixtures with {ge} 1% hydrogen additions can result in hydrogen concentrations greater than 5 wt. ppm in the weld metal and reduce ductility via hydrogen embrittlement. For the conditions investigated, the degree of hydrogen embrittlement is highly variable between 5 and 14 wt. ppm. investigation of hydrogen embrittlement of EN82H GTAW welds via tensile testing, light microscopy, transmission electron microscopy, orientation imaging microscopy, and thermal desorption spectroscopy shows that this variability is due to the inhomogeneous microstructure of the ... continued below

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4689 Kilobytes pages

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Young, G.A.; Battige, C.K.; Liwis, N.; Penik, M.A.; Kikel, J.; Silvia, A.J. et al. March 18, 2001.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Lockheed Martin
    Publisher Info: Lockheed Martin Corporation, Schenectady, NY 12301 (United States)
    Place of Publication: Schenectady, New York

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Nickel based alloys are often welded with argon/hydrogen shielding gas mixtures to minimize oxidation and improve weld quality. However, shielding gas mixtures with {ge} 1% hydrogen additions can result in hydrogen concentrations greater than 5 wt. ppm in the weld metal and reduce ductility via hydrogen embrittlement. For the conditions investigated, the degree of hydrogen embrittlement is highly variable between 5 and 14 wt. ppm. investigation of hydrogen embrittlement of EN82H GTAW welds via tensile testing, light microscopy, transmission electron microscopy, orientation imaging microscopy, and thermal desorption spectroscopy shows that this variability is due to the inhomogeneous microstructure of the welds, the presence of recrystallized grains, and complex residual plastic strains. Specifically, research indicates that high residual strains and hydrogen trapping lower the ductility of Ni-Cr-Mn-Nb weld metal when dissolved hydrogen concentrations are greater than 5 wt. ppm. The inhomogeneous microstructure contains columnar dendritic, cellular dendritic, and recrystallized grains. The decreased tensile ductility observed in embrittled samples is recovered by post weld heat treatments that decrease the bulk hydrogen concentration below 5 wt. ppm.

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4689 Kilobytes pages

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OSTI as DE00821694

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  • Other Information: PBD: 18 Mar 2001

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  • Report No.: LM-01K132
  • Grant Number: AC12-00SN39357
  • DOI: 10.2172/821694 | External Link
  • Office of Scientific & Technical Information Report Number: 821694
  • Archival Resource Key: ark:/67531/metadc782729

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  • March 18, 2001

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 28, 2016, 8:44 p.m.

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Young, G.A.; Battige, C.K.; Liwis, N.; Penik, M.A.; Kikel, J.; Silvia, A.J. et al. Factors Affecting the Hydrogen Embrittlement Resistance of Ni-Cr-Mn-Nb Welds, report, March 18, 2001; Schenectady, New York. (digital.library.unt.edu/ark:/67531/metadc782729/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.