Abstract
The evolution of grain boundary character distribution (GBCD) in the CoCrMo alloys processed by SLM and post-heat treatments (aging and solid solution) has been investigated by the electron backscatter diffraction (EBSD) and transmission electron microscope techniques. A high fraction of Σ3n (n = 1, 2, 3) grain boundaries and the corresponding clusters occur in the solid solution-treated samples at 1150 °C, which indicates GBCD optimization is somewhat realized. The coherent and incoherent Σ3 boundaries were distinguished via the single-section trace analysis method based on EBSD measurements. Σ3 boundaries in the SLMed and aged samples were determined as incoherent, while those in the solid solution-treated sample are coherent. Regular ε precipitation did not occur in the solid solution-treated samples as in the aged samples. Instead, stacking fault bands associated with coherent Σ3 twin boundaries are dominant. It suggests that post-heat treatment has a significant influence on the GBCD, especially the Σ3 grain boundary characteristics.
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This work was supported by Key R&D Plan of the Ministry of Science and Technology (2018YFB1105900), Shandong Province Key R&D Project (Grant Number 2018GGX103017), and Zibo City and SDUT Integration Project (Grant Number 2018ZBXC154).
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Li, H., Shao, S., Ren, X. et al. Grain boundary character distribution in the CoCrMo alloy processed by selective laser melting and post-heat treatment. J Mater Sci 55, 16780–16790 (2020). https://doi.org/10.1007/s10853-020-05237-7
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DOI: https://doi.org/10.1007/s10853-020-05237-7