| Autor: |
LIU Li-yu, GAO Xiang-yu, YANG Xian-feng, HE Yu-huai |
| Jazyk: |
čínština |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 46, Iss 2, Pp 128-133 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2016.000891 |
| Popis: |
Room Temperature vibration fatigue S-N curves of single crystal superalloy DD6 with[001] orientation was investigated and room temperature vibration fatigue limit was obtained. The fracture mechanism was studied by OM, SEM and EBSD. The results show that based on S-N method, vibration fatigue limit of DD6 single crystal superalloy with[001] orientation is estimated to be around 337.5MPa. Vibration fatigue fracture presents single or several {111} octahedral slip planes. SEM observations show that fracture has two regions:fatigue source region and the fatigue crack propagation regions, the fatigue cracks initiate at the surface or internal defect of the cross-section with the maximum stress, and exhibits a single source feature, fatigue crack propagation region exhibits quasi-cleavage fracture, no typical fatigue striation feature. Crystal plane slip along {111} is the main deformation mechanism of RT vibration fatigue fracture of single crystal superalloy DD6, quasi-cleavage propagation plane in fracture and quasi-cleavage patterns in microstructure are the main features of RT vibration fatigue fracture of single crystal superalloy DD6. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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