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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
, Article Materials and Design ; Volume 32, Issue 2 , February , 2011 , Pages 869-876 ; 02641275 (ISSN) ; Kokabi, A. H ; Hosseini, H. R. M ; Sharif University of Technology
Abstract
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...
Influence of peak temperature during simulation and real thermal cycles on microstructure and fracture properties of the reheated zones
, Article Materials and Design ; Volume 31, Issue 6 , June , 2010 , Pages 2948-2955 ; 02641275 (ISSN) ; Kokabi, A. H ; Madaah Hosseini, H. R ; Sharif University of Technology
2010
Abstract
The objective of this paper is to study the influence of the second peak temperature during real and simulated welding on properties of the subcritically (S), intercritically (IC) and supercritically (SC) reheated coarse grained heat affected (CGHAZ) zones. The X80 high strength pipeline microalloyed steel was subject to processing in a double-pass tandem submerged arc welding process with total heat input of 6.98 kJ/mm and thermal cycles to simulate microstructure of reheated CGHAZ zones. This involved heating to a first peak temperature (TP1) of 1400 °C, then reheating to different second peak temperatures (TP2) of 700, 800 and 900 °C with a constant cooling rate of 3.75 °C/s. Toughness of...