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Effects of Inclusions on Delayed Fracture Properties of Three TWinning Induced Plasticity (TWIP) Steels

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Abstract

In the present study, delayed fracture properties of a high-Mn TWinning Induced Plasticity (TWIP) steel and two Al-added TWIP steels were examined by dipping tests of cup specimens in the boiled water, after which the microcrack formation behavior was analyzed. The TWIP steels contained a small amount of elongated MnS inclusions, spherical-shaped AlN particles, and submicron-sized (Fe,Mn)3C carbides. Since MnS inclusions worked as crack initiation sites, longitudinal cracks were formed along the cup forming direction mostly by MnS inclusions. These cracks were readily grown when high tensile residual stresses affected the cracking or hydrogen atoms were gathered inside cracks, which resulted in the delayed fracture. In the Al-added steels, MnS inclusions acted as crack initiation and propagation sites during cup forming or boiled-water dipping test, but residual stresses applied to MnS might be low for the crack initiation and growth. Thus, longitudinal cracks formed by MnS inclusions did not work much for delayed fracture. AlN particles present in the Al-added steels hardly acted as crack initiation or growth sites for the delayed fracture because of their spherical shape.

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Authors and Affiliations

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

    Seokmin Hong (Research Assistant), Sang Yong Shin (Research Professor), Hyoung Seop Kim (Professor), Sunghak Lee (Professor) & Nack J. Kim (Professor)

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

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

  3. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Gwangyang, 545-711, Korea

    Sung-Kyu Kim (Senior Principal Researcher)

  4. TWIP Steel Research Project Team, Technical Research Laboratories, POSCO, Gwangyang, 545-711, Korea

    Kwang-Geun Chin (Senior Vice President)

  5. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Nack J. Kim (Professor)

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  1. Seokmin Hong
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Correspondence to Sang Yong Shin.

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Manuscript submitted December 30, 2011.

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Hong, S., Shin, S.Y., Kim, H.S. et al. Effects of Inclusions on Delayed Fracture Properties of Three TWinning Induced Plasticity (TWIP) Steels. Metall Mater Trans A 44, 776–786 (2013). https://doi.org/10.1007/s11661-012-1472-2

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