Microstructure and crystallographic texture of high frequency electric resistance welded X65 pipeline steel

Kopparthi Ravikiran, Leijun Li, Greg Lehnhoff, Nitin Kumar Sharma, Rangasayee Kannan, Nitin Saini, Suvan Dev Choudhury, Zhe Lyu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Microstructure and crystallographic texture and their correlation with impact toughness of high-frequency electric resistance welded (HF-ERW) X65 Grade pipeline steel have been investigated. X65 base metal after HF-ERW has formed a typical hourglass-shaped weld joint with four different regions, including the thermomechanical-affected zone (TMAZ), fine-grained heat affected zone (FGHAZ), coarse-grained heat affected zone (CGHAZ), and bondline (Weld Zone). X65 base metal shows prominent (113) [110] and (112) [110] texture components due to thermomechanical-controlled processing. TMAZ depicted random texture with a minor intensity of Cube component (001)[110] due to the partial recrystallization during welding. In the FGHAZ and CGHAZ, near the bondline, the base metal texture has been converted to rotated Goss (110) [110], Goss (110) [001], and rotated cube (001) [110] due to the recrystallization of the austenite and the shear deformation in the austenite temperature range. A high density of {100} and {110} cleavage planes is observed in the CGHAZ, which is often found to be the fracture location for the impact toughness testing.

Original languageEnglish
Article number127758
JournalMaterials Chemistry and Physics
Volume302
DOIs
StatePublished - Jul 1 2023

Funding

The authors acknowledge the support from MITACS through the Accelerate program and thank Dr. Jing Su, EVRAZ NA, for her help in texture data interpretation and Dr. Alejandro Hintze Cesaro, EVRAZ NA, for his valuable suggestions.

Keywords

  • HF-ERW
  • Microstructure
  • Texture
  • Toughness
  • X65 steel

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