Journal article
Mitigation of hydrogen embrittlement in alloy custom age 625 PLUS® via grain boundary engineering
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v 818, 141377
22 Jun 2021
Abstract
Hydrogen embrittlement is the deterioration of mechanical properties in a metal exposed to hydrogen, often characterized by brittle, intergranular fracture at low applied stresses. While grain boundary engineering has been applied to mitigate this issue, ambiguity in the mechanisms behind hydrogen embrittlement leads to ambiguity in the mechanism by which grain boundary engineering helps to mitigate this problem. In this study, grain boundary engineering was applied to improve resistance to hydrogen embrittlement in Custom Age 625 PLUS (R), an alloy frequently used in corrosive environments where hydrogen embrittlement is of particular concern. Iterative low strain cold rolling followed by annealing at intermediate temperature successfully produced a grain boundary engineered microstructure with large twin-related domains and a high fraction of interconnected coincident site lattice (CSL) boundaries. Rising step load testing demonstrated that grain boundary engineering increased the stress intensity at which failure from hydrogen embrittlement occurred and caused a shift from intergranular to transgranular crack propagation. Evidence of localized plasticity on fracture surfaces suggest that hydrogen-enhanced localized plasticity (HELP) is the dominant mechanism of hydrogen embrittlement.
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Details
- Title
- Mitigation of hydrogen embrittlement in alloy custom age 625 PLUS® via grain boundary engineering
- Publication Details
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v 818, 141377
- Publisher
- ELSEVIER SCIENCE SA; LAUSANNE
- Grant note
- RWD, ACL, and MLT acknowledge funding from NSF Early Career Award Program (Grant #115087) . The authors thank Professor Roger Doherty and Drs. Christopher Barr and Matthew Hartshorne for useful discussion.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000661920300001
- Scopus ID
- 2-s2.0-85107701815
- Other Identifier
- 991021860763204721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering
- Nanoscience & Nanotechnology