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Cu첨가 극저탄소 고강도강의 가공성에 미치는 Al과 B의 영향
김성일(S. I. Kim),정경환(K. H. Chung),홍문희(M. H. Hong) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
This paper examines the effect of nitride formation on formability for Cu bearing high strength extra low carbon (ELC) steel sheets. For this purpose, we have investigated the effect of addition of aluminium (Al) and boron (B) on texture and precipitation behavior of the ELC steel duing continuous annealing. Mechanical properties and microstructures of the ELC steel sheets were analyzed as well using uni-axial tensile test, electron back-scattered diffraction (EBSD) technique and transmission electron microscopy (TEM) following pilot rolling and continuous annealing. It has been found that the addition of Al and B increases the precipitation of AIN and BN. What is more, the scavange of solute nitrogen is effective in increasing the formability of the ELC steels. In addition, the Al and B addition improves the aging property of the ELC steel.
시간 의존성 구성방정식을 이용한 AA6022-T4판재의 탄성 복원 예측
박태준(T. Park),류한선(R. Ryou),이명규(M. G. Lee),정경환(K. H. Chung),R.H. Wagoner,정관수(K. Chung) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The time-dependent constitutive law was developed based on viscoelastic-plasticity to describe the time-dependent spring-back behavior of aluminum alloy 6022-T4 sheets. Besides nonlinear viscoelasticity, non-quadratic anisotropic yield function, Yld2000-2d, was used to account for the anisotropic yield behavior, while the combined isotropic-kinematic hardening law was used to represent the Bauschinger effect and transient hardening. For verification purposes, finite element simulations were performed for the draw-bending and the results were compared with experimental results.