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An innovative method for calibrating local cooling rate in electroslag remelting of M42 high-speed steel

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Abstract

The determination of the local cooling rate has a great significance in optimizing the parameters of electroslag remelting (ESR) and improving the quality of the ingots. An innovative method was proposed for calibrating the local cooling rate of M42 high-speed steel (HSS) in the ESR process. After resolidification at different cooling rates under high-temperature laser confocal microscopy, the carbide network spacing of the specimen was observed using a scanning electron microscope. A functional relationship between the cooling rate and average carbide network spacing was established. The average local cooling rate of the solidification process of the M42 HSS ingot was calibrated. The results show that the higher the cooling rate, the smaller the network spacing of the carbides. For the steel ingot with a diameter of 360 mm, the average local cooling rate was 0.562 °C/s at the surface, 0.057 °C/s at the position of 0.25D (where D is the diameter of the ingot), and 0.046 °C/s at the center of the ingot.

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Acknowledgements

The authors gratefully express their appreciation to the National Natural Science Foundation of China (Nos. 51974153, U1960203, and 51974156), the Joint Fund of State Key Laboratory of Marine Engineering and University of Science and Technology Liaoning (SKLMEA-USTL-201901, SKLMEA-USTL-201707), and China Scholarship Council (201908210457).

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Authors and Affiliations

  1. School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, China

    Wan-ming Li, Shi-chao Jiao, Wen-jie Tong, Xi-min Zang & Yu-an Jing

  2. State Key Laboratory of Marine Engineering, Anshan, 114051, Liaoning, China

    De-jun Li

  3. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Zhou-hua Jiang & Hua-bing Li

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  1. Wan-ming Li
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  2. Shi-chao Jiao
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  3. Wen-jie Tong
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  4. Xi-min Zang
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  5. De-jun Li
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  6. Zhou-hua Jiang
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  7. Hua-bing Li
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Correspondence to Wan-ming Li or Xi-min Zang.

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Li, Wm., Jiao, Sc., Tong, Wj. et al. An innovative method for calibrating local cooling rate in electroslag remelting of M42 high-speed steel. J. Iron Steel Res. Int. 28, 990–996 (2021). https://doi.org/10.1007/s42243-020-00471-4

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