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CHEN Yanqing, DU Zeyu, XU Lianghong. Microstructure and mechanical properties of heat affected zone for X80 pipeline steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (5): 101-104.
Citation: CHEN Yanqing, DU Zeyu, XU Lianghong. Microstructure and mechanical properties of heat affected zone for X80 pipeline steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (5): 101-104.
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Microstructure and mechanical properties of heat affected zone for X80 pipeline steel

  • 1.

    School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Shougang Research Institute of Technology, Beijing 100043, China

  • 2.

    School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

  • 3.

    Shougang Research Institute of Technology, Beijing 100043, China

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  • Received Date: July 14, 2009
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    • Abstract
  • The thermal simulation and microstructure a-nalysis technology were used to investigate the microstructure and mechanical properties of the heat affected zone for X80 pipeline.Results indicated that the toughness of coarse-grain zone and crit-ical heat affected zone in X80 pipeline HAZ were weak.Brittle zone happens in coarse-grain zone.The low toughness of coarse-zone was ascribed to the coarse grain size,the increasing quanti-ty of granular bainite and upper bainite as well as other unbal-ance low and middle temperature transformation products.The impact toughness of coarse-grain zone decreases with the increase of t8/5 Fined-grain zone is the softening zone in HAZ,the sof-tening degree increases with the increase of heat input.
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