2021 Fiscal Year Research-status Report
Novel strengthening mechanisms of high-strength Ni-Fe-based superalloys
| Project/Area Number |
20K15057
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| Research Institution | Tohoku University |
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Principal Investigator |
孫 飛 東北大学, 材料科学高等研究所, 助教 (00836562)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | Ni-Fe-based superalloy / L12 ordered precipitate / Orowan mechanism / Dislocation |
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| Outline of Annual Research Achievements |
Ni-Fe-based alloys with desirable and stable microstructure have been obtained after appropriate heat treatment processing. Tensile tests have been carried out at room temperature and high temperatures. Microstructure characterization using optical microscopy, SEM, and TEM has been performed to investigate the deformation behavior and related microstructure evolution. Complex dislocation configurations have been observed at different temperatures in terms of slip bands, Orowan process, and shearing process. The critical size of L12 precipitate for dislocation movement transfering from Orowan looping to shearing has been calculated, which is also consistent with the experimental observation using TEM. Deformation behavior and microstructure evolution have been well investigated.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The research has been going smoothly until now. This is mainly because the research plan has been made step by step carefully. Each step has been carried out successfully and even with unexpectedly good results. All the facilities needed to be used have been reserved in advance to save time and also make the process at a good pace.
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| Strategy for Future Research Activity |
According to the current results, creep tests will be considered to carry out to investigate the dislocation interactions with the grown-up L12 precipitate during the long creep term. Multi Orowan process will be possible and expected during the long creep term. Such effect on the creep property will be identified. Moreover, some important parameters will be considered to clarify those strengthening effects. In addition, the simulation will be also to carried out to propose some affecting factors. Finally, the research results will be well estimated during the last period.
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| Causes of Carryover |
The fees for mechanical tests and microstructure characterization are needed. In addition, travel fees are also needed for collaboration.
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