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Effect of tandem submerged arc welding process and parameters of Gleeble simulator thermal cycles on properties of the intercritically reheated heat affected zone

Moeinifar, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2010.07.005
  3. Abstract:
  4. The effects of real and Gleeble simulated double pass thermal cycles on the properties of the intercritically reheated coarse grained heat affected zones in X80 microalloyed pipeline steel has been investigated. The Gleeble simulated process involved heating the X80 steel specimens to the first peak temperature of 1400°C and then reheating to the second peak temperature of 800°C, with different cooling rates. The size and area fraction of martensite/austenite (M/A) constituents were obtained by a combination of field emission scanning electron microscopes and image analysis software. In addition, misorientation was characterized by electron back-scatter diffraction analysis. It is clear that the intercritically thermal cycles have a significant effect on morphology of M/A constituents. The M/A constituent's size, such as mean diameter and length, are important factors influencing Charpy impact properties of thermally simulated intercritically reheated heat affected zones. The simulated thermal cycles of the intercritically reheated region in the high heat input tandem submerged arc welding processes, showed extremely poor Charpy impact absorbed energy. The intercritical reheated thermal cycles with lower heat input value showed higher Charpy impact absorbed energy due to a decrease in the prior-austenite grain and M/A particle size
  5. Keywords:
  6. Area fraction ; Austenite grain ; Charpy impact ; Coarse grained heat affected zone ; Cooling rates ; D. Welding ; Double pass ; E. Fracture ; Electron back scatter diffraction ; F. Microstructure ; Field emission scanning electron microscopes ; Gleeble ; Heat input ; Image analysis software ; Mean diameter ; Mis-orientation ; Peak temperatures ; Pipeline steel ; Simulated process ; Submerged arc ; Thermal cycle ; X80 steel ; Carbon dioxide arc welding ; Field emission ; Fracture ; Heat affected zone ; Image analysis ; Microstructure ; Scanning electron microscopy ; Submerged arc welding ; Submerged melt welding ; Thermal cycling ; Electric welding
  7. Source: Materials and Design ; Volume 32, Issue 2 , February , 2011 , Pages 869-876 ; 02641275 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306910004401