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침탄질화 처리된 SCM415강의 깊이에 따른 확산 및 마모특성 변화
이수연(Su Yeon Lee),윤국태(Kuk Tea Youn),허석환(Seok Hwan Huh),이찬규(Chan Gyu Lee) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.5
In this study, the change in diffusion coefficient and wear characteristic with depth in the carbonitriding layer of SCM415 steel was discussed. To determine the diffusion coefficient, depth profile of carbon was measured from the surface using the Glow Discharge Spectrometer. In otherwise, measurements of carbide fraction, micro vickers hardness of surface and observation of microstructure have been implemented through the SEM image. Fe<sub>3</sub>(C,N) layer and effective depth were increased as the time for carbonitriding takes longer. According to wear experiment, the results showed that wear resistance was improved by Fe<sub>3</sub>layer and effective depth.
논문: 건설용 이형 철근(SD35, SD30A)의 점용접성
이수연 ( Su Yeon Lee ),이찬규 ( Chan Gyu Lee ),( Vladimir S. Gornakov ),( Osamu Taguchi ),유대황 ( Dea Hwang Yoo ),윤국태 ( Kuk Tea Youn ),박대영 ( Dae Young Park ),허석환 ( Seok Hwan Huh ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.5
The spot weldability of metal joints between SD35 and SD30A steel was investigated. This study was aimed to determine the spot welding parameters (i.e. welding current and time) for reinforcement bar joint and to evaluate the weldability, mechanical strength, hardness and microstructure. The results indicated that shear strength and elongation of the welding joints at 12.5kA and 1000ms were 26.7kgf/mm2 and 22%, respectively. And fracture distribution of them by using shear and tensile test showed 100% necking mode and 100% ductile mode, respectively.