期刊
MATERIALS SCIENCE AND TECHNOLOGY
卷 38, 期 12, 页码 876-881出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2022.2067613
关键词
Nanoparticles; Mo addition; Precipitation-strengthened steel; Atom probe tomography; First-principles calculation
资金
- National Natural Science Foundation of China [U1860103, 52101025]
- Fundamental Research Funds for the Central Universities [N2209003]
- Key Research and Development Program of lvliang [219114]
- Doctoral Scientific Research Foundation of Liaoning Province [2019-BS-254]
- Advanced Computing East China Sub-center
- LvLiang Cloud Computing Center of TianHe-2 of China
In this study, the influence of Mo addition on multiple precipitates in high-strength ferritic steel was investigated using atom probe tomography and first-principles calculations. It was confirmed that a co-precipitate in the steel was nucleated from the abundance of Cu atoms. The addition of Mo accelerated the nucleation process of Cu-rich precipitates and structural transformation of co-precipitates, and significantly increased the nucleation rate of a NiAl-based precipitate.
In this study, atom probe tomography and first-principles calculations were used to investigate the influence of Mo addition on multiple precipitates, including isolated NiAl-based precipitates as well as NiAl-based and Cu-rich co-precipitates, in high-strength ferritic steel. The co-NiAl-based precipitates were experimentally confirmed to be nucleated from the abundance of Cu atoms. The addition of Mo accelerated the nucleation process of Cu-rich precipitates and structural transformation of co-precipitates, led to a considerable increase in the nucleation rate of NiAl-based precipitates, and slightly promoted isolated NiAl-based precipitates. The results were discussed from the perspective of lattice misfits and mixing enthalpy.
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