Precipitation and Dislocation Strengthening Behaviour of Grade X80 Steel for Pipeline with Strain Based Design

  • Weihua Sun
  • Shu-e Hu
  • Guobao Li
  • Hao Yu
Conference paper

Abstract

This paper analyzes precipitation and dislocation strengthening behaviors of a 27mm thick Niobium-bearing Grade X80 steel plate for strain based design line pipe manufacture. The steel is produced by thermal-mechanical processing (TMCP) and is characterized with granular bainite and polygonal ferrite microstructure. Mechanical properties of both the steel and the UOE pipe are briefly introduced. Transmission electron microscope (TEM) is used to investigate the fine grain structure, distribution of the precipitates and dislocations in the steel. Precipitate morphologies, volume fractions of M(C,N), M3C, CaS, AlN and Cu are extensively studied respectively by Electrolytic Chemical Phase Analysis (ECPA) and X-ray Small Angle Diffraction (X-ray SAD). Dislocations in the steel are characterized with Positron Annihilation analysis. The results prove that precipitation hardening reveal a 58.1MPa strengthening contribution by the precipitates less than 20nm in size. Dislocation hardening is approximately 176MPa to the present studied steel and 198MPa to the pipe.

Keywords

Line pipe steel Strain based design Precipitation Dislocations Nb-bearing steel 
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Copyright information

© TMS 2016

Authors and Affiliations

  • Weihua Sun
    • 1
  • Shu-e Hu
    • 1
  • Guobao Li
    • 1
  • Hao Yu
    • 2
  1. 1.Shandong Iron and Steel Co., LtdJinanChina
  2. 2.University of Science & Technology BeijingBeijingChina

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