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

DE2004821694

Publication Date	2001
Personal Author	Young, G. A.; Battige, C. K.; Lewis, N.; Penik, M. A.; Kikel, J.; Silvia, A. J.; McDonald, C. K.
Page Count	12
Abstract	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.
Keywords	Hydrogen embrittlement Alloys Welded joints Desorption Ductility Heat treatments Microscopy Microstructure Mixtures Nickel Oxidation Plastics Shielding Spectroscopy Strains Transmission electron microscopy
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417

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

Factors Affecting the Hydrogen Embrittlement Resistance of Ni-Cr-Mn-Nb Welds.
DE2004821694

Publication Date	2001
Personal Author	Young, G. A.; Battige, C. K.; Lewis, N.; Penik, M. A.; Kikel, J.; Silvia, A. J.; McDonald, C. K.
Page Count	12
Abstract	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.
Keywords	Hydrogen embrittlement Alloys Welded joints Desorption Ductility Heat treatments Microscopy Microstructure Mixtures Nickel Oxidation Plastics Shielding Spectroscopy Strains Transmission electron microscopy
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lockheed Martin Electronics Labs., Syracuse, NY.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200417