Abstract
Tellurium (Te) modification is an important method to improve the morphology of sulfide (MnS) in steel, the morphology of MnS varies with the difference in Te content of Te-containing inclusions. To explore the relationship between the concentration of Te in Te-containing inclusions and the morphology, 32 and 68 ppm Te were added into medium-carbon microalloyed steel (MCMAS) under laboratory conditions. It shows that the average density and area content of inclusion increase with the increasing Te content in steel, the distribution of inclusions is the most uniform in S2, unlike the aggregation of inclusions in S3. The main types of inclusions include single-particle MnS and telluride (MnTe), as well as their composite inclusions. Different types of composite inclusions can be divided into semi-surround composite (SSC), surround composite (SC), equivalent composite (EC), and ovulatory composite (OC). Combining the observation results, the nucleation kinetics of MnS and MnTe, and the crystallographic analysis of various MnS and MnTe phases, the formation mechanisms of different Te-containing inclusions were discussed.
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Acknowledgments
The authors gratefully express their appreciation to Natural Science Foundation of China (Grant No. 52074179) for supporting this work. One of the authors, Xiangyu Xu, gratefully acknowledges support from the National Natural Science Foundation of China (Youth Program No. 52104335) and Shanghai “Super Postdoctoral” Incentive Plan (Grant No. 2020194). Nianfu Liu and Jianxun Fu appreciate the foundation’s support of Major Science and Technology Special Projects in Guangdong Province (Grant No. 220814196271010).
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Tian, Q., Wang, Z., Zhang, X. et al. Formation Mechanism of Different Morphologies Inclusions in Tellurium-Containing Medium-Carbon-Microalloyed Steel. Metall Mater Trans B 54, 3405–3415 (2023). https://doi.org/10.1007/s11663-023-02917-y
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DOI: https://doi.org/10.1007/s11663-023-02917-y