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Effects of Cooling Conditions on Tensile and Charpy Impact Properties of API X80 Linepipe Steels

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Abstract

In this study, four API X80 linepipe steel specimens were fabricated by varying the cooling rate and finish cooling temperature, and their microstructures and crystallographic orientations were analyzed to investigate the effects of the cooling conditions on the tensile and Charpy impact properties. All the specimens consisted of acicular ferrite (AF), granular bainite (GB), and martensite-austenite (MA) constituents. The volume fraction of MA increased with an increasing cooling rate, and the volume fraction and size of MA tended to decrease with an increasing finish cooling temperature. According to the crystallographic orientation analysis data, the effective grain size and unit crack path decreased as fine ACs having a large amount of high-angle grain boundaries were homogeneously formed, thereby leading to the improvement in the Charpy impact properties. The specimen fabricated with the higher cooling rate and lower finish cooling temperature had the highest upper-shelf energy (USE) and the lowest energy transition temperature (ETT), because it contained a large amount of MA homogeneously distributed inside fine AFs, while its tensile properties remained excellent.

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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. 2007Y202.

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Authors and Affiliations

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

    Seung Youb Han (Research Assistant), Sang Yong Shin (Postdoctoral Research Associate), Sunghak Lee (Professor) & Nack J. Kim (Professor)

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

    Sunghak Lee (Professor)

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

    Nack J. Kim (Professor)

  4. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Pohang, 790-785, Korea

    Jin-Ho Bae (Principal Researcher) & Kisoo Kim (Group Leader)

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  1. Seung Youb Han
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  2. Sang Yong Shin
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  3. Sunghak Lee
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Correspondence to Sunghak Lee.

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Manuscript submitted June 21, 2009.

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Han, S.Y., Shin, S.Y., Lee, S. et al. Effects of Cooling Conditions on Tensile and Charpy Impact Properties of API X80 Linepipe Steels. Metall Mater Trans A 41, 329–340 (2010). https://doi.org/10.1007/s11661-009-0135-4

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  • DOI: https://doi.org/10.1007/s11661-009-0135-4

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