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Research on the fatigue properties of sub-HAZs in the X80 pipe
  • +2
  • Kai Xu,
  • Gui Qiao,
  • Jun Wang,
  • Shi Zhang,
  • Furen Xiao
Kai Xu
Yanshan University College of Materials Science and Engineering
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Gui Qiao
Yanshan University
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Jun Wang
Yanshan University
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Shi Zhang
Yanshan University
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Furen Xiao
Yanshan University
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Abstract

Pipeline transmission is one of the most important ways of oil and gas transportation, and its safety is majorly threatened by fatigue fracture that generally occurs in heat-affected zone (HAZ) adjacent to the welded joint of the pipeline. Therefore, studying the fatigue properties of HAZ is important. In this work, the microstructure and mechanical properties in the HAZ of a X80 pipe were accurately simulated by thermal simulation. The fatigue life and crack growth rate of typical sub-HAZ were tested. Results showed that the fine grain HAZ had the lowest strength and fatigue life. By contrast, the coarse grain HAZ had the highest strength, but its fatigue life was lower than that of the intercritical HAZ. Furthermore, the microstructure of each sub-HAZ and its effect on fatigue properties were discussed in detail. The results will reveal the effects of microstructure and mechanical properties on the service safety of pipeline transportation.

Peer review status:ACCEPTED

20 Mar 2020Submitted to Fatigue & Fracture of Engineering Materials & Structures
21 Mar 2020Submission Checks Completed
21 Mar 2020Assigned to Editor
27 Mar 2020Reviewer(s) Assigned
07 Jul 2020Review(s) Completed, Editorial Evaluation Pending
11 Jul 2020Editorial Decision: Revise Major
22 Jul 20201st Revision Received
22 Jul 2020Assigned to Editor
22 Jul 2020Submission Checks Completed
22 Jul 2020Reviewer(s) Assigned
03 Aug 2020Review(s) Completed, Editorial Evaluation Pending
04 Aug 2020Editorial Decision: Revise Minor
04 Aug 20202nd Revision Received
04 Aug 2020Assigned to Editor
04 Aug 2020Submission Checks Completed
04 Aug 2020Review(s) Completed, Editorial Evaluation Pending
05 Aug 2020Editorial Decision: Accept