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Columnar to equiaxed transition during solidification of small ingot by using electric current pulse

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Abstract

A new approach to applying the electric current pulse (ECP) with parallel electrodes to the promotion of the transition from columnar crystal to equiaxed crystal and the improvement of macrosegregation was introduced. The ECP was applied to different stages of the solidification. The results showed that the application of the ECP in both the initial stage (the thickness of solidified shell reached 2 mm approximately) and the late stage (the thickness of solidified shell reached 14 mm approximately) of solidification can promote the columnar to equiaxed transition (CET). The analysis showed that during solidification, a large number of nuclei around the upper surface fell off due to ECP, which subsequently showered on the melt and impinged the growth front of the columnar crystal. Therefore, the CET occurred. In addition, this method was also employed to influence the solidification process of bearing steel, and the results showed that the structure was changed from columnar crystal to equiaxed crystal, indicating that ECP can enhance the homogeneity of structure and composition of bearing steel.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, 200072, Shanghai, China

    Jie Li (Doctor Candidate), Jian-hong Ma, Chang-jiang Song, Zhi-jun Li, Yu-lai Gao & Qi-jie Zhai

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  1. Jie Li
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  2. Jian-hong Ma
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  3. Chang-jiang Song
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  4. Zhi-jun Li
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  6. Qi-jie Zhai
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Correspondence to Jie Li.

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Foundation Item: Item Sponsored by National Natural Science Foundation of China (50674064, 50734008)

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Li, J., Ma, Jh., Song, Cj. et al. Columnar to equiaxed transition during solidification of small ingot by using electric current pulse. J. Iron Steel Res. Int. 16, 7–12 (2009). https://doi.org/10.1016/S1006-706X(10)60019-2

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  • DOI: https://doi.org/10.1016/S1006-706X(10)60019-2

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