Yujin Seong - Academia.edu (original) (raw)

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Papers by Yujin Seong

Research paper thumbnail of Analysis of bending behavior of TiN particle-reinforced martensitic steel using micro-digital image correlation

Materials Science and Engineering: A

Research paper thumbnail of Effects of microstructure and internal defects on mechanical anisotropy and asymmetry of selective laser-melted 316L austenitic stainless steel

Materials Science and Engineering: A

Research paper thumbnail of Physics-Based Constitutive Model of Porous Materials for Die/Isostatic Compaction of Metallic Powders

Metals and Materials International

Research paper thumbnail of Investigation and two-stage modeling of sintering behavior of nano/micro-bimodal powders

Research paper thumbnail of Effect of nanoparticles in bimodal powder on physical and mechanical properties of powder injection molded parts

Journal of Materials Processing Technology

Research paper thumbnail of Effect of Porosity on Mechanical Anisotropy of 316L Austenitic Stainless Steel Additively Manufactured by Selective Laser Melting

Journal of Korean Powder Metallurgy Institute

Research paper thumbnail of Effects of residual stress on the mechanical properties of copper processed using ultrasonic-nanocrystalline surface modification

Materials Research Letters

Effects of surface grain refinement and residual stress on the local and global properties of pur... more Effects of surface grain refinement and residual stress on the local and global properties of pure Cu processed using ultrasonic nanocrystalline surface modification (UNSM) was investigated. To distinguish each contribution to the local hardness and global tensile properties of the UNSM treated Cu, a stress-relief specimen of the same microstructure as the UNSM treated one was produced by lowtemperature annealing after the UNSM treatment. The distinct contributions of residual stress and surface grain refinement to the tensile property of UNSM treated Cu were determined and discussed. IMPACT STATEMENT The contributions of surface grain refinement and compressive residual stress on the enhanced local and global strengths of the UNSM-processed Cu were estimated as 80% and 20%, respectively.

Research paper thumbnail of Dominant mechanisms of the sintering of copper nano-powders depending on the crystal misalignment

Computational Materials Science, 2016

Research paper thumbnail of Atomistic Simulation of Sintering Mechanism for Copper Nano-Powders

Journal of Korean Powder Metallurgy Institute, 2015

The sintering mechanisms of nanoscale copper powders have been investigated. A molecular dynamics... more The sintering mechanisms of nanoscale copper powders have been investigated. A molecular dynamics (MD) simulation with the embedded-atom method (EAM) was employed for these simulations. The dimensional changes for initial-stage sintering such as characteristic lengths, neck growth, and neck angle were calculated to understand the densification behavior of copper nano-powders. Factors affecting sintering such as the temperature, powder size, and crystalline misalignment between adjacent powders have also been studied. These results could provide information of setting the processing cycles and material designs applicable to nano-powders. In addition, it is expected that MD simulation will be a foundation for the multi-scale modeling in sintering process.

Research paper thumbnail of Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

Physical review. E, 2016

We studied the magnetic interaction between circular Janus magnetic particles suspended in a Newt... more We studied the magnetic interaction between circular Janus magnetic particles suspended in a Newtonian fluid under the influence of an externally applied uniform magnetic field. The particles are equally compartmentalized into paramagnetic and nonmagnetic sides. A direct numerical scheme is employed to solve the magnetic particulate flow in the Stokes flow regime. Upon applying the magnetic field, contrary to isotropic paramagnetic particles, a single Janus particle can rotate due to the magnetic torque created by the magnetic anisotropy of the particle. In a two-particle problem, the orientation of each particle is found to be an additional factor that affects the critical angle separating the nature of magnetic interaction. Using multiparticle problems, we show that the orientation of the particles has a significant influence on the dynamics of the particles, the fluid flow induced by the actuated particles, and the final conformation of the particles. Straight and staggered chain...

Research paper thumbnail of Analysis of bending behavior of TiN particle-reinforced martensitic steel using micro-digital image correlation

Materials Science and Engineering: A

Research paper thumbnail of Effects of microstructure and internal defects on mechanical anisotropy and asymmetry of selective laser-melted 316L austenitic stainless steel

Materials Science and Engineering: A

Research paper thumbnail of Physics-Based Constitutive Model of Porous Materials for Die/Isostatic Compaction of Metallic Powders

Metals and Materials International

Research paper thumbnail of Investigation and two-stage modeling of sintering behavior of nano/micro-bimodal powders

Research paper thumbnail of Effect of nanoparticles in bimodal powder on physical and mechanical properties of powder injection molded parts

Journal of Materials Processing Technology

Research paper thumbnail of Effect of Porosity on Mechanical Anisotropy of 316L Austenitic Stainless Steel Additively Manufactured by Selective Laser Melting

Journal of Korean Powder Metallurgy Institute

Research paper thumbnail of Effects of residual stress on the mechanical properties of copper processed using ultrasonic-nanocrystalline surface modification

Materials Research Letters

Effects of surface grain refinement and residual stress on the local and global properties of pur... more Effects of surface grain refinement and residual stress on the local and global properties of pure Cu processed using ultrasonic nanocrystalline surface modification (UNSM) was investigated. To distinguish each contribution to the local hardness and global tensile properties of the UNSM treated Cu, a stress-relief specimen of the same microstructure as the UNSM treated one was produced by lowtemperature annealing after the UNSM treatment. The distinct contributions of residual stress and surface grain refinement to the tensile property of UNSM treated Cu were determined and discussed. IMPACT STATEMENT The contributions of surface grain refinement and compressive residual stress on the enhanced local and global strengths of the UNSM-processed Cu were estimated as 80% and 20%, respectively.

Research paper thumbnail of Dominant mechanisms of the sintering of copper nano-powders depending on the crystal misalignment

Computational Materials Science, 2016

Research paper thumbnail of Atomistic Simulation of Sintering Mechanism for Copper Nano-Powders

Journal of Korean Powder Metallurgy Institute, 2015

The sintering mechanisms of nanoscale copper powders have been investigated. A molecular dynamics... more The sintering mechanisms of nanoscale copper powders have been investigated. A molecular dynamics (MD) simulation with the embedded-atom method (EAM) was employed for these simulations. The dimensional changes for initial-stage sintering such as characteristic lengths, neck growth, and neck angle were calculated to understand the densification behavior of copper nano-powders. Factors affecting sintering such as the temperature, powder size, and crystalline misalignment between adjacent powders have also been studied. These results could provide information of setting the processing cycles and material designs applicable to nano-powders. In addition, it is expected that MD simulation will be a foundation for the multi-scale modeling in sintering process.

Research paper thumbnail of Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

Physical review. E, 2016

We studied the magnetic interaction between circular Janus magnetic particles suspended in a Newt... more We studied the magnetic interaction between circular Janus magnetic particles suspended in a Newtonian fluid under the influence of an externally applied uniform magnetic field. The particles are equally compartmentalized into paramagnetic and nonmagnetic sides. A direct numerical scheme is employed to solve the magnetic particulate flow in the Stokes flow regime. Upon applying the magnetic field, contrary to isotropic paramagnetic particles, a single Janus particle can rotate due to the magnetic torque created by the magnetic anisotropy of the particle. In a two-particle problem, the orientation of each particle is found to be an additional factor that affects the critical angle separating the nature of magnetic interaction. Using multiparticle problems, we show that the orientation of the particles has a significant influence on the dynamics of the particles, the fluid flow induced by the actuated particles, and the final conformation of the particles. Straight and staggered chain...

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