Effect of welding heat input on microstructures and toughness in simulated CGHAZ of V–N high strength steel

On the determining role of acicular ferrite in V-N microalloyed steel in increasing strength-toughness combination

“…4. In the orientation image map, different colors indicate different crystallographic orientations, and are accordingly identified by grain boundary misorientation in the image quality map, where the red lines represent low misorientation boundaries of 2-15°and blue lines correspond to high misorientation boundaries of 15°and greater than 15° [27,32]. The colonies of pearlite could hardly be distinguished from the ferrite by EBSD analysis [33][34].…”

“…The mechanism of inclusion stimulated nucleation is summarized as follows [18,24]: (1) solute depletion from austenite in the vicinity of non-metallic inclusion; (2) good lattice matching [24][25][26]. In the absence of sulfide inclusions, acicular ferrite is capable of nucleating on V(C,N) precipitates in V-N microalloying low S steel [12,[27][28]. Ferrite exhibits Baker-Nutting orientation relationship with respect to small vanadium nitride (VN), and (001) VN [24,[29][30].…”

Effects of Welding Heat Input on Microstructure and Electrochemical Behavior of Flux-Cored Arc-Welded Q690 HSLA Steel

“…Indeed, the welding heat input is the most aggregative indicator of welding parameters such as the welding current, the voltages, and the speeds [14]. e welding heat input is one of the most important factors for the combination property determination of the WM [15]. In contrast, only rare researches exist regarding the electrochemical behavior of the FCAW Q690 HSLA steel, particularly with respect to the welding heat input effect.…”

Investigation on the characterization and properties of EH36 steel FCB welded joint

“…By determining the welding consumables and base metals, the comprehensive properties of the weld joints are mainly affected by the welding technology. The variation of the comprehensive properties is caused by the lax control of the welding parameters, which are necessary to control in proper range [4]. For the welding conditions, the weld heat input is the aggregative indicator to response the welding current, voltages and speeds, as is one of the most important factors to determine the combination properties of the welding joints.…”