摘要
The creep tests of three different orientations of the single crystal superalloy DD6 were carried out at 980℃. The results indicate that the creep failure mechanism of superalloy is the initiation of micropores and the propagation of microcracks, which is caused by dislocation motion. The dislocation morphology of monocrystals in [001], [111] and [011] orientation at the initial stage of creep was analyzed by transmission electron microscopy (TEM), matching the characteristics of the octahedral sliding system activated, the hexahedral sliding system activated and the simultaneous motion of the two sliding systems, respectively. Based on the crystal plasticity theory, the creep constitutive model and creep damage model under variational stress conditions considering Orowan effect and dislocation blocking effect were established; meanwhile, the model parameters were fitted according to the creep curve obtained from the test. Moreover, the finite element simulation results of the model and creep fracture morphology of monocrystalline materials confirm each other and explain the anisotropic behavior of monocrystalline creep.
投稿的翻译标题 | Anisotropic Creep Life Prediction of Nickel-based Single Crystal Based on Dislocation Movement |
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源语言 | 繁体中文 |
页(从-至) | 3930-3938 |
页数 | 9 |
期刊 | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
卷 | 48 |
期 | 12 |
出版状态 | 已出版 - 1 12月 2019 |
关键词
- Creep fracture
- Crystal plasticity
- Dislocation movement
- Nickel based single crystal superalloy