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Correlation of Microstructure and Cracking Phenomenon Occurring during Hot Rolling of Lightweight Steel Plates

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Abstract

An investigation was conducted into the correlation of microstructure and the cracking phenomenon that often occurred in hot-rolled lightweight steel plates. Two kinds of steels were fabricated with varying Mn and Al contents, and their microstructures, tensile properties, and high-temperature transformation behavior were investigated. In the two steels, banded structures containing ferrite grains and κ-carbides were well developed along the rolling direction. Detailed microstructural analyses showed that cracks initiated at film-type κ-carbides continuously formed interfaces between bands, while the band populated with κ-carbides did not play an important role in initiating cracks. Thus, the formation of band structures and film-type interfacial κ-carbides must be minimized to prevent the cracking. The decreased content of hardenability elements, including aluminum, higher finish-rolling temperature, reduced central segregation during the slabmaking process, and decreased material variation during hot rolling, were suggested as practical methods for preventing the cracking.

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Acknowledgments

This work was supported by the National Research Laboratory Program (Grant No. ROA-2004-000-10361-0(2008)) funded by the Korea Science and Engineering Foundation (KOSEF) and by POSCO under Contract No. 2008Y221. The authors thank Professor Byeong-Joo Lee, POSTECH, and Dr. Sung-kyu Kim, POSCO, for their help with the alloying effect and microstructural analysis.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea

    Sang Yong Shin (Researcher), Seung Youb Han (Student) & Sunghak Lee (Professor)

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea

    Chang-Hyo Seo (Student), Kayoung Choi (Student) & Nack J. Kim (Professor)

  3. Plate Research Group, Technical Research Laboratories, Pohang Iron and Steel Company (POSCO), Pohang, 790-785, Korea

    Hackcheol Lee (Researcher)

  4. Automotive Steels Research Group, Technical Research Laboratories, Pohang Iron and Steel Company (POSCO), Pohang, 790-785, Korea

    Jai-Hyun Kwak (Researcher) & Kwang-Geun Chin (Researcher)

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  1. Sang Yong Shin
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  2. Hackcheol Lee
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  3. Seung Youb Han
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  7. Nack J. Kim
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Correspondence to Sunghak Lee.

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Manuscript submitted May 21, 2009.

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Shin, S.Y., Lee, H., Han, S.Y. et al. Correlation of Microstructure and Cracking Phenomenon Occurring during Hot Rolling of Lightweight Steel Plates. Metall Mater Trans A 41, 138–148 (2010). https://doi.org/10.1007/s11661-009-0081-1

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