Microstructural Characteristics and Impact Fracture Behaviors of a Novel High-Strength Low-Carbon Bainitic Steel with Di
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WITH the continuous development of metallurgical technology and thermo-mechanical controlled process (TMCP), a novel 690 MPa grade low-carbon microalloyed bainitic hot-rolled plate steel with seismic, corrosion, and high-temperature resistance has been developed. This steel can be widely used in large-scale
JUNJUN CUI is with the State Key Laboratory of Rolling and Automation, Northeastern University, 3-11 Wenhua Road, Shenyang 110819, P.R. China and also with Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine, Shenyang Institute of Technology, Fushun 113122, P.R. China. Contact e-mail: [email protected] WENTING ZHU and LIQING CHEN are with the State Key Laboratory of Rolling and Automation, Northeastern University. Contact e-mail: [email protected] ZHENYE CHEN is with the State Key Laboratory of Rolling and Automation, Northeastern University and also with Technical Department, Technology Research Institute of HBIS, 3 Yangzi Road, Shijiazhuang 050023, P.R. China. Manuscript submitted July 19, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
structural engineering fields such as ships, pipelines, bridges, and buildings. The typical advantage of this microalloyed steel is the grain refinement of austenite that results from the Zener pinning effect from fine microalloy (Nb, V, Ti) nitrides or carbides and the formation of a surface film due to the addition of Cr, Cu, and Mo. However, during the welding processes (especially for high heat input welding), the original mechanical properties of the base metal are destroyed because of the rapid heating rate and local uneven cooling rate, and this limits the application range. For the medium/thick plate welding, multilayer and multipass welding are used. Heat treatment of the welded heat-affected zone (HAZ) in the previous weld bead is performed via thermal effect of the next weld bead at different temperatures. In the previous research works by other scholars as well as the author of this paper,[1,2] it has been found that the properties of coarse-grained heat-affected zones (CGHAZ) in high-strength low-carbon microalloyed bainitic steel are poor. Hence, it is necessary to study the microstructure and properties of reheated CGHAZ in multipass welding. According to
differences in the secondary pass welding thermal cycle peak temperature (tp2), reheated CGHAZ is divided into four regions, namely unaltered reheated CGHAZ (UA CGHAZ, tp2>1200 °C), supercritical reheated CGHAZ (SCR CGHAZ, AC3
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