| Autor: |
Reza Esmaeilizadeh, Xiaolong Li, Mathias Kuhlow, Stuart Holdsworth, Ali Keshavarzkermani, Hamid Jahed, Ehsan Toyserkani, Ehsan Hosseini |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Additive Manufacturing Letters, Vol 9, Iss , Pp 100201- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2772-3690 |
| DOI: |
10.1016/j.addlet.2024.100201 |
| Popis: |
This study investigates the fatigue behaviour of samples made by laser powder-bed fusion of Hastelloy X (LPBF-HX) with as-built and machined surface conditions at 700 °C under fully reversed strain-controlled cyclic loading. Samples with both surface conditions exhibited initially cyclic hardening followed by cyclic softening under large strain amplitude testing, where a slight continuous hardening was observed for tests with smaller strain amplitudes. The samples with machined surfaces showed longer endurance and higher stress ranges than those with as-built surfaces. Post-fatigue-test EBSD analysis showed the formation of the Goss texture and extensive local strain accumulation in the samples tested under high strain amplitude at 700 °C. Fractography investigations revealed that early crack initiation in the samples with as-built surfaces was from stress concentrations induced by valleys on the rough surface. No evidence of crack initiation induced by pre-existing defects was observed in the machined samples, and the excessive slip activity at the surface was found to be responsible for the crack initiation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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