期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 128, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2020.102659
关键词
Superalloys; Dislocations; Rafting; Directional coarsening; Phase field; Crystal plasticity
资金
- Deutsche Forschungsgemeinschaft (DFG), Germany [SFB/TR 103]
- Fundamental Research Program of Korea Institute of Materials Science, South Korea [PNK6410]
45 degrees rafting of Ni-based superalloys has been investigated with the help of creep test simulations applying a strain gradient crystal plasticity model coupled to the multi-phase field method. This mode of rafting lies in between P- and N-type rafting modes. The model parameters are calibrated against experimental data for N-type rafting under high temperature and low stress creep condition. By increasing the stress level, the mixed-mode rafting of precipitates with a clear tendency toward formation of 45 degrees rafts is observed. We show that the key factor for the occurrence of this type of rafting is the generation of highly localized creep strain of more than 10% due to non-homogeneous creep deformation in the form of slip bands. We have successfully captured the evolution of microstructure under high stress leading to production of localized shear bands.
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