Abstract
The chemical composition, morphology, size and amount of MC-type primary carbonitrides were analyzed in H13 steel, including long strip (Vx,Mo1−x)(Cy,N1−y) and small square (Tix,V1−x)(Cy,N1−y). Statistical results showed that x value in (Tix,V1−x)(Cy,N1−y) was enhanced in correlation with Ti content in steel, which was beneficial to (Tix,V1−x)(Cy,N1−y) precipitation on the basis of thermodynamics. The amount of total MC primary carbonitrides was increased in the samples, of which the square ones evidently increased while strip ones first increased and then declined as Ti content increased. It was found that (Tix,V1−x)(Cy,N1−y) could act as the heterogeneous nucleation core of the outer layer (Vx,Mo1−x)(Cy,N1−y), forming multilayer carbonitrides. Increasing (Tix,V1−x)(Cy,N1−y) would promote the formation of complex strip carbonitrides in sample #2, but would inhibit the precipitation of strip (Vx,Mo1−x)(Cy,N1−y) precipitates in sample #3 because of much easier combination with V and N for (Tix,V1−x)(Cy,N1−y). The average size of both square and strip precipitates gradually decreased as Ti rose in the samples. It was speculated that the effect of (Tix,V1−x)(Cy,N1−y) promoting the complex multilayer carbonitrides and inhibiting (Vx,Mo1−x)(Cy,N1−y) precipitation as Ti changed would have a relationship with characteristics change in MC carbonitrides.
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Acknowledgments
This work is financially supported by Hebei Natural Science Foundation (Grant Nos. E2020402067 and E2020402016) and State Key Laboratory of Advanced Metallurgy (Grant No. K1:21-08) and National Natural Science Foundation (Grant No. 51541402) of China. The authors express their sincere thanks to Tianjin Cisri-Harder Materials & Technology Co., Ltd., and Hebei Technological Innovation Center for High Quality Cold Heading Steel for the experiment and analysis.
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Manuscript submitted March 4, 2021; accepted December 1, 2021.
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Sun, X., Guo, H., Song, G. et al. Effect of Ti Content on the Characteristics of MC-Type Primary Carbonitrides in H13 Steel. Metall Mater Trans B 53, 895–901 (2022). https://doi.org/10.1007/s11663-021-02411-3
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DOI: https://doi.org/10.1007/s11663-021-02411-3