Elucidating the contribution of mobile hydrogen-deformation interactions to hydrogen-induced intergranular cracking in polycrystalline nickel

Harris, Zachary D.; Lawrence, Samantha K.; Medlin, Douglas L.; Guetard, Gael; Burns, James T.; Somerday, Brian P.

doi:10.1016/j.actamat.2018.07.043

Elucidating the contribution of mobile hydrogen-deformation interactions to hydrogen-induced intergranular cracking in polycrystalline nickel

Journal Article · Fri Jul 20 00:00:00 EDT 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.07.043· OSTI ID:1465388

^[1]; Lawrence, Samantha K. ^[2]; Medlin, Douglas L. ^[3]; Guetard, Gael ^[4]; Burns, James T. ^[1]; Somerday, Brian P. ^[5]

Univ. of Virginia, Charlottesville, VA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
OxMet Technologies, Oxford (United Kingdom)
Southwest Research Institute, San Antonio, TX (United States); Kyushu Univ., Fukuoka (Japan)

Uniaxial mechanical testing conducted at room temperature (RT) and 77 K on hydrogen (H)-exposed nickel was coupled with targeted microscopy to evaluate the influence of deformation temperature, and therefore mobile H-deformation interactions, on intergranular cracking in nickel. Results from interrupted tensile tests conducted at cryogenic temperatures (77 K), where mobile H-deformation interactions are effectively precluded, and RT, where mobile H-deformation interactions are active, indicate that mobile H-deformation interactions are not an intrinsic requirement for H-induced intergranular fracture. Moreover, an evaluation of the true strain for intergranular microcrack initiation for testing conducted at RT and 77 K suggests that H which is segregated to grain boundaries prior to the onset of straining dominates the H-induced fracture process for the prescribed H concentration of 4000 appm. Lastly, recent experiments suggesting that H-induced fracture is predominately driven by mobile H-deformation interactions, as well as the increased susceptibility of coherent twin boundaries to H-induced crack initiation, are re-examined in light of these new results.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC04-94AL85000

OSTI ID:: 1465388

Alternate ID(s):: OSTI ID: 1703711

Report Number(s):: SAND--2018-8650J; 666958

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 158; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Dislocations
Grain boundaries
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Elucidating the contribution of mobile hydrogen-deformation interactions to hydrogen-induced intergranular cracking in polycrystalline nickel

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