Oxygen changes crack modes of Ni-based single crystal superalloy
Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture b...
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
Taylor & Francis Group
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/f9edc0eaf46b44c68e856d679c6764be |
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| Summary: | Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at 650°C under stress. The in-situ oxidation was found to change the tensile fracture mode from the close-packed {111} planes of plastic fracture to $ \{001\} $ planes adjacent to γ/γ′ interfaces of brittle fracture. The microanalysis also revealed that the γ′ cuboids, γ phase, and γ/γ interface exhibit different oxidation behavior, thus underscoring the thickness debit effect. |
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