Abstract
The morphology, size, quantity, and composition of complex oxide + carbonitride in H13 steel held at 1250 °C for 5, 10, and 15 h were determined. The results show that the ratio and number of complex carbonitrides with cores in H13 steel are gradually increased when holding at 1250 °C compared with those in the original H13 steel, and the core size increases. There are one or more oxide cores in (Tix,V1−x)(Cy,N1−y), including xCaO·zAl2O3, xCaO·yMgO·zAl2O3, and CaO after holding at 1250 °C, in addition to MgO·Al2O3 and Al2O3 in the original steel. The equilibrium temperature for (Tix, V1−x)(Cy,N1−y) precipitation at the solidification front and decomposition in the solid state was theoretically analyzed, which was affected by the x value and the product of Ti and N contents in H13 steel. Meanwhile, the composition of (Tix,V1−x)(Cy,N1−y) is influenced by the oxide cores. It is convinced that (Tix,V1−x)(Cy,N1−y) with oxide cores has a higher stability, especially for oxides with a high Al2O3 content. Heat treatment at high temperature facilitates a more reasonable analysis of oxide + carbonitride, and the generation mechanism of oxide + carbonitride was discussed.
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Acknowledgements
This work is financially supported by Hebei Natural Science Foundation under Grant Nos. E2020402067, E2018402098, and E2021402056, Open Program of State Key Laboratory of Advanced Metallurgy under Grant No. K1:21-08, Key Project of Handan Scientific Research Program under Grant No. 21122015004, and the Science and Technology Research and Development Program of Handan City under Grant No. 21422101235. The authors would like to express their sincere thanks to Tian** CISRI-HARDER Materials & Technology Co., Ltd. for the experiment.
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Sun, Xl., Guo, Hj., Guo, J. et al. Characteristics and stability of oxide + carbonitride in H13 steel at 1250 °C. J. Iron Steel Res. Int. 31, 134–142 (2024). https://doi.org/10.1007/s42243-022-00833-0
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DOI: https://doi.org/10.1007/s42243-022-00833-0