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Analysis and Prevention of Dent Defects Formed during Strip Casting of Twin-Induced Plasticity Steels

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Abstract

Rapid-solidification experiments were conducted for understanding dent defects formed during strip casting of twin-induced plasticity (TWIP) steels. The rapid-solidification experiments reproduced the dent defects formed on these steels, which were generally located at valleys of the shot-blasted roughness on the substrate. The rapid-solidification experiment results reveal that the number of dips, the Mn content of the steel, and the surface roughness of the substrate affect the depth and size of dents formed on the solidified-shell surfaces, while the composition of the atmosphere gases and the carbon content of the steel are not factors. The formation of dents was attributed to the entrapment of gases inside the roughness valleys of the substrate surface and their volume expansion due to the temperature of the steel melt and the latent heat. The dents could be prevented when the thermal expansion of gases was suppressed by making longitudinal grooves on the substrate surface, which allowed the entrapped gases to escape. Sound solidified shells were obtained by optimizing the width and depth of the longitudinal grooves and by controlling the shot-blasting conditions.

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Acknowledgments

The authors thank POSCO and the National Research Laboratory Program (Grant No. M10400000361-06J0000-36110) funded by the Korea Science and Engineering Foundation (KOSEF) for the support of this work.

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Authors and Affiliations

  1. POSTRIP R&E Project Department, Technical Research Laboratories, POSCO, Pohang, 790-785, Korea

    Manjin Ha (Principal Researcher), Wan-Soo Kim (Principal Researcher) & Hee-Kyung Moon (Senior Principal Researcher)

  2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, Korea

    Byeong-Joo Lee (Professor) & Sunghak Lee (Professor)

  3. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Sunghak Lee (Professor)

Authors
  1. Manjin Ha
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  2. Wan-Soo Kim
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  3. Hee-Kyung Moon
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  4. Byeong-Joo Lee
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  5. Sunghak Lee
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Corresponding author

Correspondence to Sunghak Lee.

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Manuscript submitted May 20, 2007.

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Ha, M., Kim, WS., Moon, HK. et al. Analysis and Prevention of Dent Defects Formed during Strip Casting of Twin-Induced Plasticity Steels. Metall Mater Trans A 39, 1087–1098 (2008). https://doi.org/10.1007/s11661-008-9496-3

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