| 플래시버트 용접과 연속열간압연법으로 제조된 철근의 기계적 성질과 미세조직에 미치는 합금원소의 영향 |
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| Effect of Alloying Elements on Mechanical Properties and Microstructure of Steel Bar Fabricated by Endless Bar Rolling System with Flash Butt Welding |
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Ki-Won Kim, Seung-Jae Cho, Chung-Yum Kang |
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| Abstract |
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Flash butt welding is applied in many industries. New technology was developed recently for joining billets which called "EBROS (Endless Bar Rolling System)". After reheating billets in furnace, two billets were joined using flash butt welding. The objective of this study was to investigate the effect of alloying elements on mechanical properties of flash butt welded zone of hot rolled steel bar. The tensile properties on welded zone of Fe-Mn steel and Fe-Mn-V steel were dropped as compared with non-welded zone. Fe-Mn-Nb steel was opposed to the former. It was found that the white band at the welded zone had high ferrite volume fraction and large ferrite grain size. The vertical white band between flash butt welded billets was transformed into an arrowhead it of steel bar. According to this band, softening has been appeared. There was a interesting phenomenon with HAZ of Fe-Mn-Nb Steel, 40nm scale of particles were observed and hardness of HAZ was higher than non-welded zone. |
| Key Words:
Flash butt welding, Billet, Endless bar rolling system, Reinforcing steel bar, White band |
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