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Correlation of Microstructure, Chip-Forming Properties, and Dynamic Torsional Properties in Free-Machining Steels

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Abstract

Four free-machining steels were fabricated by varying volume fractions of MnS and soft metal additives of Pb and Bi, and their microstructures, tensile properties, chip-forming properties, and dynamic torsional properties were analyzed. Machining and dynamic torsional tests were conducted on the four steels to investigate chip-forming and dynamic torsional properties, respectively. In the Pb-S- and Bi-S-based steels, the chip thickness and ridge area of the 1st chip obtained from the machining test were smaller than in the S-based steels and were not changed much after repeated machining processes. These chip-forming properties were closely related with dynamic torsional properties. Dynamic maximum shear strains of the Pb-S- and Bi-S-based steels were higher than those of the S-based steels, while dynamic maximum shear stresses were lower, thereby leading to the relatively homogeneous dynamic shear deformation and to the better chip-forming properties and machinability.

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Acknowledgments

This work was supported by POSCO under contract No. 20108008.

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Authors and Affiliations

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

    Yongjin Kim (Research Assistant, Senior Researcher), Hyunmin Kim (Research Assistant), Minju Kang (Research Assistant) & Sunghak Lee (Professor)

  2. Plate Research Group, Technical Research Laboratories, POSCO, Pohang, 790-300, Korea

    Yongjin Kim (Research Assistant, Senior Researcher)

  3. Product Solution Research Group, Songdo Product Application Center, POSCO, Incheon, 406-840, Korea

    Kiho Rhee (Senior Researcher)

  4. Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, GmbH, 40237, Düsseldorf, Germany

    Sang Yong Shin (Postdoctoral Researcher)

  5. Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 90-784, Korea

    Sunghak Lee (Professor)

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  1. Yongjin Kim
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  2. Hyunmin Kim
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  3. Minju Kang
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  4. Kiho Rhee
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  5. Sang Yong Shin
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  6. Sunghak Lee
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Correspondence to Sunghak Lee.

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Manuscript submitted April 18, 2012.

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Kim, Y., Kim, H., Kang, M. et al. Correlation of Microstructure, Chip-Forming Properties, and Dynamic Torsional Properties in Free-Machining Steels. Metall Mater Trans A 44, 4613–4625 (2013). https://doi.org/10.1007/s11661-013-1828-2

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  • DOI: https://doi.org/10.1007/s11661-013-1828-2

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