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Influence and regulation of hydrogen content in pure copper rod billet during negative pressure continuous casting process

  • Metals & corrosion
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Abstract

The regulation of hydrogen content in the continuous casting process is conducive to the reduction of pore defects in the casting billet. In this paper, the influence of negative pressure (NP) and continuous casting speed (CCS) on hydrogen content in copper rod billet prepared by negative pressure continuous casting (NPCC) technique was analyzed, and the mechanism of the coordinated coupling of NP and melt flow on hydrogen removal was revealed. It is clarified that with the CCS of 20 mm min−1 and an increase in the NP value from − 20 to − 80 kPa, the hydrogen content is reduced from 1.0 to 0.3 ppm. The coordinated action of NP and melt flow induced by CCS can minimize the hydrogen content. When the NP value is − 80 kPa and the CCS is 10 mm min−1, the hydrogen content is as low as 0.2 ppm, and the hydrogen removal rate is 85.7%. The larger the NP, the smaller the critical nucleation radius of the hydrogen bubble, and the larger the growth rate of the hydrogen bubble. The coupling of the NP field and flow field can make the melt which is difficult to nucleate and grow of the hydrogen bubble flow to the position which is easy to nucleate and grow. The effect of the vortex fields in the purification chamber on the removal of hydrogen is not affected by the CCS, but the CCS affects the floating of hydrogen at the solidification front, which leads to a small increase in the hydrogen content with the increase of the CCS. Our study provides a theoretical basis for the preparation of high-quality metal billets.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51974027, U1703131).

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Authors and Affiliations

  1. Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qinan Ba, Xuefeng Liu & Ligui Gai

  2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing, 100083, China

    Qinan Ba, Xuefeng Liu, Yaohua Yang & Ligui Gai

  3. Key Laboratory for Advanced Materials Processing of Ministry of Education, University of Science and Technology Beijing, Beijing, 100083, China

    Qinan Ba, Xuefeng Liu, Yaohua Yang & Ligui Gai

Authors
  1. Qinan Ba
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  2. Xuefeng Liu
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  3. Yaohua Yang
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  4. Ligui Gai
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Contributions

Qinan Ba: Methodology, Writing-Original draft, Conceptualization, Formal analysis, Writing-Review & Editing, Visualization. Xuefeng Liu: Conceptualization, Validation, Supervision. Writing-Review & Editing, Funding acquisition. Yaohua Yang: Visualization, Investigation. Ligui Gai: Visualization, Investigation.

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Correspondence to Xuefeng Liu.

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Ba, Q., Liu, X., Yang, Y. et al. Influence and regulation of hydrogen content in pure copper rod billet during negative pressure continuous casting process. J Mater Sci (2024). https://doi.org/10.1007/s10853-024-09747-6

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