The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy
Abstract
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 hydrogenmore »
- Authors:
-
- Univ. of Virginia, Charlottesville, VA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1601433
- Alternate Identifier(s):
- OSTI ID: 1703873
- Report Number(s):
- SAND-2019-11536J
Journal ID: ISSN 1359-6454; 679587
- Grant/Contract Number:
- AC04-94AL85000; NA-0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 186; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Hydrogen embrittlement; Monel K-500; Precipitate–dislocation interactions; Work hardening
Citation Formats
Harris, Zachary D., Bhattacharyya, Jishnu J., Ronevich, Joseph A., Agnew, Sean R., and Burns, James T. The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy. United States: N. p., 2020.
Web. doi:10.1016/j.actamat.2020.01.033.
Harris, Zachary D., Bhattacharyya, Jishnu J., Ronevich, Joseph A., Agnew, Sean R., & Burns, James T. The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy. United States. https://doi.org/10.1016/j.actamat.2020.01.033
Harris, Zachary D., Bhattacharyya, Jishnu J., Ronevich, Joseph A., Agnew, Sean R., and Burns, James T. Wed .
"The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy". United States. https://doi.org/10.1016/j.actamat.2020.01.033. https://www.osti.gov/servlets/purl/1601433.
@article{osti_1601433,
title = {The combined effects of hydrogen and aging condition on the deformation and fracture behavior of a precipitation-hardened nickel-base superalloy},
author = {Harris, Zachary D. and Bhattacharyya, Jishnu J. and Ronevich, Joseph A. and Agnew, Sean R. and Burns, James T.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2020.01.033},
journal = {Acta Materialia},
number = C,
volume = 186,
place = {United States},
year = {2020},
month = {1}
}
Web of Science
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