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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 four wires tandem submerged arc welding process on heat affected zone properties in high strength pipeline steel
, Article Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies, MIMT 2010, 22 January 2010 through 24 January 2010 ; 2010 , Pages 85-89 ; 9780791859544 (ISBN) ; Kokabi, A. H ; Madaah Hosseini, H. R ; Shang, C. J ; Hui, G ; Wei, L. Z ; Sharif University of Technology
2010
Abstract
The objective of this investigation was to provide a detailed evaluation of the heat affected zone properties of a high-strength pipeline steel. The X80 high-strength low-alloy microalloyed steel was supplied as a hot rolled plate with accelerated cooling. The four-wire tandem submerged arc welding process with different heat input was used to generate welded joints. The microstructure of the heat affected zone depended on heat input values. M/A constituent appeared in the microstructure of HAZ region for all of the specimens along the prior-austenite grain boundaries and between bainitic ferrite laths. Charpy impact specimens were notched in four locations: FL (fusion line), FL+1mm, FL+2mm...
Role of tandem submerged arc welding thermal cycles on properties of the heat affected zone in X80 microalloyed pipe line steel
, Article Journal of Materials Processing Technology ; Volume 211, Issue 3 , 2011 , Pages 368-375 ; 09240136 (ISSN) ; Kokabi, A. H ; Hosseini, H. R. M ; Sharif University of Technology
Abstract
The influence of thermal cycles on the properties of the coarse grained heat affected zone in X80 microalloyed steel has been investigated. The thermal simulated involved heating the X80 steel specimens to the peak temperature of 1400 °C, with different cooling rates. The four-wire tandem submerged arc welding process, with different heat input values, was used to generate a welded microstructure. The martensite/austenite constituent appeared in the microstructure of the heat affected zone region for all the specimens along the prior-austenite grain boundaries and between the bainitic ferrite laths. The blocky-like and stringer martensite/austenite morphology were observed in the heat...
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...