The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy

Harris, Zachary D.; Bhattacharyya, Jishnu J.; Ronevich, Joseph A.; Agnew, Sean R.; Burns, James T.

doi:10.1016/j.actamat.2020.01.033

Title: The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy

Journal Article · 22 January 2020 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2020.01.033 · OSTI ID:1601433

^[1]; Bhattacharyya, Jishnu J. ^[1]; Ronevich, Joseph A. ^[2]; Agnew, Sean R. ^[1]; Burns, James T. ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

The effect of hydrogen (H) on the deformation behavior of Monel K-500 in various isothermal heat treatment conditions (non-aged, under-aged, peak-aged, and over-aged) was assessed via uniaxial mechanical testing. H-charged and non-charged specimens were strained to failure to facilitate a comparison of ductility, fracture surface morphology, strength, and work hardening behavior. For all examined heat treatment conditions, H charging leads to a significant reduction in ductility, which is accompanied by a consistent change in fracture surface morphology from ductile microvoid coalescence to brittle intergranular fracture. While H charging led to a systematic enhancement in the yield strength of all heat treatments, the three age-hardened conditions exhibited a more than 2-fold increase relative to the non-aged heat treatment. This suggests that H modifies the dislocation–precipitate interactions, which also manifest themselves through changes in work hardening metrics related to the dislocation storage and recovery rates. In particular, the H-charged peak-aged specimen exhibited a significant increase in initial hardening (dislocation storage) rate relative to the H-charged under-aged specimen. Transmission electron microscopy of these samples revealed the onset of widespread dislocation looping in the H-charged peak-aged sample, in addition to the planar slip bands characteristic of the non-charged condition. This result suggests that hydrogen induces the particle shearing-to-looping transition at smaller particle sizes. Possible mechanistic explanations for this observed behavior are presented.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA-0003525

OSTI ID:: 1601433

Alternate ID(s):: OSTI ID: 1703873

Report Number(s):: SAND-2019-11536J; 679587

Journal Information:: Acta Materialia, Vol. 186, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy

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