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An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718

Sathiskumar Jothi Orcid Logo, S.V. Merzlikin, Nick Croft Orcid Logo, J. Andersson, Steve Brown

Journal of Alloys and Compounds, Volume: 664, Pages: 664 - 681

Swansea University Authors: Sathiskumar Jothi Orcid Logo, Nick Croft Orcid Logo, Steve Brown

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DOI (Published version): 10.1016/j.jallcom.2016.01.033

Abstract

Hydrogen embrittlement of the nickel-iron based superalloy 718 has been investigated using slow strain rate tests for pre-charged material and also in-situ hydrogen charging during testing. Fractography analyses have been carried using scanning electron microscopy, electron back-scattering diffracti...

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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa25433
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spelling 2021-01-14T12:53:09.3225650 v2 25433 2016-01-06 An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718 6cd28300413d3e63178f0bf7e2130569 0000-0001-7328-1112 Sathiskumar Jothi Sathiskumar Jothi true false 8f82cd0b51f4b95b0dd6fa89427d9fc7 0000-0002-1521-5261 Nick Croft Nick Croft true false 07a865adc76376646bc6c03a69ce35a9 Steve Brown Steve Brown true false 2016-01-06 EEN Hydrogen embrittlement of the nickel-iron based superalloy 718 has been investigated using slow strain rate tests for pre-charged material and also in-situ hydrogen charging during testing. Fractography analyses have been carried using scanning electron microscopy, electron back-scattering diffraction and orientation image microscopy concentrating on the influence of microstructural features and associated micro-mechanisms leading to hydrogen induced cracking and embrittlement. It was observed that hydrogen induced transgranular cracking initiates at micro-voids in the crystal lattice. Similar behaviour has been observed in multi-scale finite element chemo-mechanical numerical simulations. In contrast, hydrogen induced localized slip intergranular cracking was associated with the formation of micro-voids in intergranular regions. The effects of grain boundary and triple junction character on intergranular hydrogen embrittlement were also investigated. It was observed that low end high angle misorientations (LHAM), 15°<θ ≤ 35°, and critical high angle misorientations (CHAM), 35° < θ ≤ 50°, are preferential sites for hydrogen induced cracking. In contrast, few or no hydrogen induced cracks were observed at low angle misorientations (LAM), 0°≤ θ ≤ 15°, high end high angle misorientations (HHAM), 50°<θ ≤ 55°, or special GB misorientations (SGB), θ > 55°. Finally, the use of grain boundary engineering techniques to increase the resistance of super alloy 718 to hydrogen induced cracking and embrittlement is discussed. Journal Article Journal of Alloys and Compounds 664 664 681 0925-8388 Aerospace engine material; Nickel based superalloy; Corrosion; hydrogen embrittlement; Grain boundaries; Microstructures Crack mechanics; Electron microscopy, Multi-scale modelling and Experimentation. 15 4 2016 2016-04-15 10.1016/j.jallcom.2016.01.033 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2021-01-14T12:53:09.3225650 2016-01-06T12:08:53.7616996 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sathiskumar Jothi 0000-0001-7328-1112 1 S.V. Merzlikin 2 Nick Croft 0000-0002-1521-5261 3 J. Andersson 4 Steve Brown 5 0025433-06012016122855.pdf RIS_SW_Paper.pdf 2016-01-06T12:28:55.1400000 Output 3042387 application/pdf Accepted Manuscript true 2017-01-06T00:00:00.0000000 true
title An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
spellingShingle An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
Sathiskumar Jothi
Nick Croft
Steve Brown
title_short An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
title_full An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
title_fullStr An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
title_full_unstemmed An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
title_sort An investigation of micro-mechanisms in hydrogen induced cracking in nickel-based superalloy 718
author_id_str_mv 6cd28300413d3e63178f0bf7e2130569
8f82cd0b51f4b95b0dd6fa89427d9fc7
07a865adc76376646bc6c03a69ce35a9
author_id_fullname_str_mv 6cd28300413d3e63178f0bf7e2130569_***_Sathiskumar Jothi
8f82cd0b51f4b95b0dd6fa89427d9fc7_***_Nick Croft
07a865adc76376646bc6c03a69ce35a9_***_Steve Brown
author Sathiskumar Jothi
Nick Croft
Steve Brown
author2 Sathiskumar Jothi
S.V. Merzlikin
Nick Croft
J. Andersson
Steve Brown
format Journal article
container_title Journal of Alloys and Compounds
container_volume 664
container_start_page 664
publishDate 2016
institution Swansea University
issn 0925-8388
doi_str_mv 10.1016/j.jallcom.2016.01.033
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Hydrogen embrittlement of the nickel-iron based superalloy 718 has been investigated using slow strain rate tests for pre-charged material and also in-situ hydrogen charging during testing. Fractography analyses have been carried using scanning electron microscopy, electron back-scattering diffraction and orientation image microscopy concentrating on the influence of microstructural features and associated micro-mechanisms leading to hydrogen induced cracking and embrittlement. It was observed that hydrogen induced transgranular cracking initiates at micro-voids in the crystal lattice. Similar behaviour has been observed in multi-scale finite element chemo-mechanical numerical simulations. In contrast, hydrogen induced localized slip intergranular cracking was associated with the formation of micro-voids in intergranular regions. The effects of grain boundary and triple junction character on intergranular hydrogen embrittlement were also investigated. It was observed that low end high angle misorientations (LHAM), 15°<θ ≤ 35°, and critical high angle misorientations (CHAM), 35° < θ ≤ 50°, are preferential sites for hydrogen induced cracking. In contrast, few or no hydrogen induced cracks were observed at low angle misorientations (LAM), 0°≤ θ ≤ 15°, high end high angle misorientations (HHAM), 50°<θ ≤ 55°, or special GB misorientations (SGB), θ > 55°. Finally, the use of grain boundary engineering techniques to increase the resistance of super alloy 718 to hydrogen induced cracking and embrittlement is discussed.
published_date 2016-04-15T03:30:24Z
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score 11.016235

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