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Dynamic Coercivity of Advanced Ferritic Steel during Long-Term Isothermal Ageing
Kim, C. S.,Lissenden, Cliff J.,Park, I. K.,Ryu, K. S. The Japan Institute of Metals 2009 MATERIALS TRANSACTIONS Vol.50 No.11
<P>The object of this study is to characterize the microstructural evolution in advanced ferritic steel for power plant during long-term isothermal ageing by measuring the reversible permeability. Ageing was observed to coarsen the tempered carbide (Cr<SUB>23</SUB>C<SUB>6</SUB>), generate the Laves (Fe<SUB>2</SUB>W) phase, and reduce the mechanical strength. The dynamic coercivity decreased monotonously during isothermal ageing. The decrease in coercivity physically depends on the domain wall movement, related with the domain wall pinning by nonmagnetic particles and the dislocations. The experimental results show that the dynamic coercivity is very sensitive to the damage accumulations due to isothermal ageing of advanced ferritic steel.</P>
Influence of Dislocation Substructure on Ultrasonic Velocity under Tensile Deformation
Kim, C.S.,Lissenden, Cliff J.,Kang, Kae-Myhung,Park, Ik-Keun The Korean Society for Nondestructive Testing 2008 한국비파괴검사학회지 Vol.28 No.6
The influence of dislocation substructure of metallic materials on ultrasonic velocity has been experimentally investigated. The test materials of pure Cu, brass (Cu-35Zn), 2.25Cr-1Mo steel, and AISI 316 with different stacking fault energy (SFE) are plastically deformed in order to generate dislocation substructures. The longitudinal wave velocit $(C_L)$ decreases as a function of tensile strain in each material. The $C_L$ of Cu-35Zn and AISI 316 decreases monotonously with tensile strain, but $C_L$ of Cu and 2.25Cr-1Mo steel shows plateau phenomena due to the stable dislocation substructure. The variation of ultrasonic velocity with the extent of dislocation damping and dislocation substructures is discussed.
PMF 분석을 이용한 ACE-Asia 측정기간 중제주 고산지역 입자상 물질의 입경별 발생원 추정
문광주,한진석,공부주,정일록,Steven S. Cliff,Thomas A. Cahill,Kelvin D. Perry 한국대기환경학회 2006 한국대기환경학회지 Vol.22 No.5
Size-and time-resolved aerosol samples were collected using an eight-stage Davis rotating unit for monitoringAsia-Pacific Regional Aerosol Characterization Experiment (ACE-Asia). These samples were analyzed usingsynchrotron X-ray uorescence for 3-hr average concentrations of 19 elements including Al, Si, S, Cl, K, Ca, Ti,V, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Rb, and Pb. The size-resolved data sets were then analyzed using theparticulate matter mass. PMF analysis uses the uncertainty of the measured data to provide an optimal weighting.Twelve sources were resolved in eight size ranges(0.09~ 12m) and included continental soil, local soil, sea salt,biomass/biofuel burning, coal combustion, oil combustion, municipal incineration, nonferrous metal source,ferrous metal source, gasoline vehicle, diesel vehicle, and volcanic emission. The PMF result of size-resolvedsource contributions showed that natural sources represented by local soil, sea salt, continental soil, and volcanicemission contributed about 79% to the predicted primary particulate matter (PM) mass in the coarse size range(1.15~ 12 m) while anthropogenic sources such as coal combustion and biomass/biofuel burning contributed about 58% in the fine size range (0.56~2.5 μm). The diesel vehicle source contributed mostly in ultra-fine size range (0.09~0.56 μm) and was responsible for about 56% of the primary PM mass.