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http://dx.doi.org/10.5762/KAIS.2012.13.5.1939

The effect of heat input and PWHT on the mechanical properties and microstructure of HSB600 steel weldments with GMAW  

Ju, Dong-Hwi (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Jang, Bok-Su (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Lim, Young-Min (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Koh, Jin-Hyun (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.5, 2012 , pp. 1939-1946 More about this Journal
Abstract
High performance steel for bridges requires higher performance in tensile and yield strength, toughness, weldability, etc. The purpose of this study is to investigate the weldability of HSB 600 steel. The effects of heat input (1.4~3.2kJ/mm) and postweld heat treatment (PWHT, $600^{\circ}C$, 40hr.) on the TMCP HSB600 steel weldments made by GMAW process were investigated. The tensile strength and hardness of as-welded specimens decreased with increasing heat input. Charpy V-notch impact energy did not show any significant difference by postweld heat treatment. The fine-grained acicular ferrite was mainly formed in the 2.1kJ/mm of heat input while polygonal and side plate ferrites were dominated in the high inputs. Meanwhile, tensile strength and hardness of PWHT weldments decreased due to the coarsening and globularization of ferrite microstructure and reduction of residual stresses with increasing heat inputs. However, there was no significant difference in the impact energy absorption.
Keywords
HSB600 steel; GMA Welding; Heat input; Microstructure; Mechanical property;
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