Abstract
In this study, the super-gravity field was used to refine primary carbides in H13 die steel. In the range of super-gravity coefficient of 40 to 140, the influences of super-gravity coefficient on the particle size distribution of primary carbides and the interdendritic element segregation were investigated. The formation time and the maximum generation radius of primary carbides were calculated, and the detailed mechanism of refining primary carbides was discussed. The experimental results show that an increase in the super-gravity coefficient is beneficial to reduce the size and quantity of primary carbides. When the super-gravity coefficient increases from 40 to 140, the quantity of primary carbides in the H13 samples solidified in super-gravity field decreases by 44 pct, and the size of the primary carbides decreases by 15.49 pct. The reason is that increasing the super-gravity coefficient can reduce the degree of interdendrite segregation of elements, and delay the growth time of primary carbides. Compared with VC, the growth time of Mo2C is more easily affected by the super-gravity coefficient. When the super-gravity coefficient increases from 40 to 140, the solid fraction at which Mo2C begins to form increases from 0.956 to 0.989.
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Acknowledgments
This work was financially supported by China Postdoctoral Fund (Grant No. 2021M700394) and Key R&D Plan of Shandong Province in 2021 (Grant No. 2021CXGC010209). The authors thank the Beijing Key Laboratory of Special Melting and Preparation of High-end Metal Materials for its support.
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Li, S., Xi, X., Qin, S. et al. Refinement Mechanism of Primary Carbides in H13 Die Steel Solidified in Super-Gravity Field. Metall Mater Trans B 53, 3184–3196 (2022). https://doi.org/10.1007/s11663-022-02597-0
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DOI: https://doi.org/10.1007/s11663-022-02597-0