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Finite Element and Experimental Analysis of Closure and Contact Bonding of Pores During Hot Rolling of Steel

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Abstract

The closure and contact bonding behavior of internal pores in steel slabs during hot rolling was studied using experiments and the finite element method (FEM). Effects of pore size and shape were investigated, and three different cases of pore closure results were observed: no closure, partial closure, and full closure. The FEM results well reproduced various closure events. Bonding strengths of unsuccessfully closed pores, measured by tensile tests, showed critical effects. Also, there was a difference in bonding strengths of several fully closed pores. Fracture surfaces showed that welded regions could be divided into three (not, partially, and perfectly) welded regions. The pressure–time curves obtained from the FEM results indicate that pore surface contact time and deformed surface length are important parameters in pore welding. Pore size, pore shape, time of pressure contact, and deformed surface length should be considered to completely eliminate pores in final products.

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Acknowledgments

This work was supported by POSCO. The simulation was supported by Grant No. KSC-2012-C2-09 from Korea Institute of Science and Technology Information.

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Authors and Affiliations

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

    Soo-Hyun Joo (Ph.D. Candidate), Jaimyun Jung (Ph.D. Candidate), Sunghak Lee (Professor) & Hyoung Seop Kim (Professor)

  2. Technical Research Laboratories, POSCO, Pohang, 790-785, Republic of Korea

    Myung Sik Chun (Senior Principal Researcher) & Chang Ho Moon (Principal Researcher)

  3. Center for Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Sunghak Lee (Professor) & Hyoung Seop Kim (Professor)

Authors
  1. Soo-Hyun Joo
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  2. Jaimyun Jung
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  3. Myung Sik Chun
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  4. Chang Ho Moon
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Correspondence to Hyoung Seop Kim.

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Manuscript submitted October 15, 2013.

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Joo, SH., Jung, J., Chun, M.S. et al. Finite Element and Experimental Analysis of Closure and Contact Bonding of Pores During Hot Rolling of Steel. Metall Mater Trans A 45, 4002–4011 (2014). https://doi.org/10.1007/s11661-014-2319-9

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  • DOI: https://doi.org/10.1007/s11661-014-2319-9

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