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Effects of microstructure on inverse fracture occurring during drop-weight tear testing of high-toughness X70 pipeline steels

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Abstract

The effects of microstructure on inverse fracture occurring in the hammer-impacted region were analyzed after conducting a drop-weight tear test (DWTT) on high-toughness pipeline steels. Three kinds of steels were fabricated by varying the alloying elements, and their microstructures were varied by the rolling conditions. The pressed-notch (PN) or chevron-notch (CN) DWTT and Charpy V-notch (CVN) impact tests were conducted on the rolled steel specimens, and the results were discussed in comparison with the data obtained from CVN tests of prestrained specimens. In the hammer-impacted region of the DWTT specimens, abnormal inverse fracture having a cleavage fracture mode appeared, and the inverse fracture area correlated well with the upper-shelf energy (USE) obtained from the CVN test and with the grain size. The steel specimens having a higher USE or having coarse polygonal ferrite tended to have a larger inverse fracture area than those having a lower USE or having fine acicular ferrite. This was because steels having a higher impact absorption energy required higher energy for fracture initiation and propagation during the DWTT. These results were confirmed by the CVN data of prestrained steel specimens.

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Authors and Affiliations

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

    Byoungchul Hwang (Postdoctoral Research Associate), Yang Gon Kim (Research Assistant), Sunghak Lee & Nack J. Kim (Professors)

  2. the Materials Science and Engineering Department, Pohang University of Science and Technology, Korea

    Sunghak Lee & Nack J. Kim (Professors)

  3. the Plate Research Group, Technical Research Laboratories, POSCO, 790-785, Pohang, Korea

    Jang Yong Yoo (Principal Researcher)

Authors
  1. Byoungchul Hwang
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  2. Yang Gon Kim
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  5. Jang Yong Yoo
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Hwang, B., Kim, Y.G., Lee, S. et al. Effects of microstructure on inverse fracture occurring during drop-weight tear testing of high-toughness X70 pipeline steels. Metall Mater Trans A 36, 371–387 (2005). https://doi.org/10.1007/s11661-005-0309-7

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  • DOI: https://doi.org/10.1007/s11661-005-0309-7

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