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Correlation of microstructure and fracture properties of API X70 pipeline steels

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Abstract

Effects of microstructure on fracture toughness and transition temperature of high-toughness X70 pipeline steels were investigated in this study. Three types of steels were fabricated by varying alloying elements such as C, Cu, and Mo, and their microstructures were varied by rolling conditions such as finish rolling temperature and finish cooling temperature. Charpy V-notch (CVN) impact tests and pressed notch drop-weight tear tests (DWTT) were conducted on the rolled steel specimens. The charpy impact test results indicated that the specimens rolled in the single-phase region of the steel containing a reduced amount of C and Mo had the highest upper shelf energy (USE) and the lowest energy transition temperature (ETT) because of the appropriate formation of acicular, quasipolygonal, or polygonal ferrite and the decreased fraction of martensite-austenite constituents. Most of the specimens rolled in the single-phase region also showed excellent DWTT properties as the percent shear area (pct SA) well exceeded 85 pct, irrespective of finish cooling temperatures, while their USE was higher than that of the specimens rolled in the two-phase region. Thus, overall fracture properties of the specimens rolled in the single-phase region were better than those of the specimens rolled in the two-phase region, considering both USE and pct SA.

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Authors and Affiliations

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

    Byoungchul Hwang (Postdoctoral Research Associate) & Young Min Kim (Research Assistant)

  2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, Korea

    Sunghak Lee (Professors) & Nack J. Kim (Professors)

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

    Seong Soo Ahn (Researcher)

Authors
  1. Byoungchul Hwang
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  2. Young Min Kim
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  3. Sunghak Lee
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  4. Nack J. Kim
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  5. Seong Soo Ahn
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are jointly appointed with the Materials Science and Engineering Department, Pohang University of Science and Technology.

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Hwang, B., Kim, Y.M., Lee, S. et al. Correlation of microstructure and fracture properties of API X70 pipeline steels. Metall Mater Trans A 36, 725–739 (2005). https://doi.org/10.1007/s11661-005-1004-4

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  • DOI: https://doi.org/10.1007/s11661-005-1004-4

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