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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.
Characterization of Microstructure and Mechanical Properties of High-Purity Iron Added with Copper
( O Taguchi ),( Su Yeon Lee ),( M Uchikoshi ),( M Isshiki ),( Chan Gyu Lee ),( S Suzuki ),( Vladimir S Gornakov ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.1
An influence of the addition of copper (0.5, 1.0 and 1.5 mass% Cu) on the microstructure and mechanical properties of high purity iron (99.998 mass%) was characterized. The microstructure and microhardness of high-purity iron based samples, which were rolled at room temperature and subsequently annealed, were investigated in this work. The microstructure of the samples has been observed by electron back scattering diffraction (EBSD) and the mechanical properties have been studied by using micro-Vickers hardness test. The results of microstructural observation showed that deformation band was formed in high purity iron by rolling at room temperature, and it was recovered by annealing up to about 900 K. The microhardness results showed that the softening of high-purity iron occurred by annealing up to about 900 K, while the hardness of iron added with about 0.5-1.5 mass% copper was kept over 100 Hv and at the early time of annealing reached a maximum. The hardness of iron added with a small amount of copper may be attributed to precipitation hardening as well as solution hardening. The orientation of crystal in recrystallized grain was almost same as that of deformed grain. (Received November 21, 2011; Revised December 28, 2011; Accepted January 19, 2012)