Bibliographic Details
| Title: |
Hydrogen embrittlement prompt fracture in Ni-based single crystal superalloy |
| Authors: |
Guangxian Lu, Yunsong Zhao, Junbo Zhao, Yanhui Chen, Haibo Long, Xianghui Li, Dingzhong Tang, Zhixun Wen, Xiaodong Han |
| Source: |
Journal of Materials Research and Technology, Vol 25, Iss , Pp 2140-2151 (2023) |
| Publisher Information: |
Elsevier, 2023. |
| Publication Year: |
2023 |
| Collection: |
LCC:Mining engineering. Metallurgy |
| Subject Terms: |
Hydrogen embrittlement, Ni-based single crystal superalloy, Dislocation, Voids, Fracture mechanism, Mining engineering. Metallurgy, TN1-997 |
| More Details: |
Hydrogen-fueled and hydrogen-hybridized aircraft engines are a new trend in the aviation industry for environmental reasons. Single crystalline Ni-based superalloys are the most commonly used engine materials and their hydrogen embrittlement properties need urgent investigation. In this study, the hydrogen embrittlement behavior and underlying fracture mechanism of a second-generation Ni-based single crystal superalloy with electrochemical hydrogen pre-charge were investigated. The superalloy showed tremendous susceptibility to hydrogen embrittlement with reduced strength and ductility. A large number of micropores and cracks on the fracture surface are found in hydrogen-charged specimens, leading to embrittlement and ultimate cracking. More dislocations, stacking faults and DSBs are observed in specimens with hydrogen uptake. Hydrogen-induced micropores first form at the γ/γ′ interface and then propagate into the γ′ phase, leading to cracking, which was analyzed using in situ environmental studies with a transmission electron microscope. Hydrogen reduces the cohesive strength between the γ- and γ′-phase and accelerates crack propagation along the voids. Hydrogen embrittlement fracture in Ni-based single crystal superalloys is due to synergistic hydrogen-enhanced local plasticity, strain-induced vacancies and decohesion in the hydrogen-induced cracking process. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2238-7854 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2238785423013364; https://doaj.org/toc/2238-7854 |
| DOI: |
10.1016/j.jmrt.2023.06.088 |
| Access URL: |
https://doaj.org/article/4d0c4f5914d14dfcb0bf075a319dfcad |
| Accession Number: |
edsdoj.4d0c4f5914d14dfcb0bf075a319dfcad |
| Database: |
Directory of Open Access Journals |
