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철도레일 테르밋 용접부의 기계적 특성 향상 방안에 관한 연구
최상규(Sang-kyu Choi),박성상(Sung-Sang Park),백응률(Eung-Ryul Baek),전봉길(Bong-Gil Chun) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
It is reported that about more than 45% of damage shown in railroad rails include breakage of rail end which cross the center of Thermit welded zone. Thermite welding is always accompanied by numerous aluminum oxide and secondary inclusions which may have a negative influence on the ductility and toughness of the weld metal. In this study the aluminum powder recycled by waste aluminum can was used for iron oxide generated after the process of welding rod and the remain aluminum was reduced by minimizing the quantity of aluminum. And complete dissolution was induced by using ferro Mn powder as the additive element. This study reviewed the applicability of heat treatment in the welded zone of rail using ceramic heating pad by carrying it out. This study could observe the improvement of the mechanical characteristics (UTS and elongation) and the changes of failure mechanism from brittleness to ductility. It could be found that improved strength and elongation result from pearilte fine structure.