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Volume 55(11); Nov 2017
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Research Papers
752 Effects of Microstructure Variation on Tensile and Charpy Impact Properties in Heavy-Section SA508 Gr.3 Low Alloy Steels for Commercial Reactor Pressure Vessel
SA508 Gr.3 상용 원자로용기강의 두께방향 미세조직 변화가 인장 및 충격특성에 미치는 영향
Seokmin Hong, Cholong Lee, Min-Chul Kim, Bong-Sang Lee
홍석민, 이초롱, 김민철, 이봉상
Korean J. Met. Mater. 2017;55(11):752-759.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.752

Abstract
In this study, the effects of microstructural variations in heavy-section reactor pressure vessel (RPV) steels on tensile and Charpy impact properties were investigated. Two PRV blocks, OPR1000 and APR1400 (ORV, ARV) were taken from the archive materials used in Korea standard nuclear power plants. Test specimens were sampled from five..... More

      
760 Material Characterization of Single Crystalline Cu Subjected to High Strain Rates and High Temperatures for Multiscale Simulation
Yujin Seong, Youngkyu Kim, Im Doo Jung, Sungho Kim, See Jo Kim, Seong-Gon Kim, Hak Jun Kim, Seong Jin Park
Korean J. Met. Mater. 2017;55(11):760-767.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.760

Abstract
The material characterization of single crystalline Cu columns was numerically carried out at the submicroscopic level. A molecular dynamics (MD) simulation was employed using the embedded-atom method (EAM) interatomic potential between a pair of Cu atoms to describe the interactions among Cu atoms. First, the relationship between mechanical properties and..... More

      
768 Pulsed Electrodeposition of Thin Cobalt Coating Layer on Ferritic Stainless Steel for SOFC Interconnects
Suk-Chul Kwak, Byung Kyu Kim, Dong-Ik Kim, Young Whan Cho
Korean J. Met. Mater. 2017;55(11):768-776.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.768

Abstract
A thin, compact, and uniform cobalt layer was coated on ferritic stainless steel (Crofer 22 APU) by high frequency square pulsed electrodeposition in an aqueous solution containing cobalt chloride and boric acid. The effects of various electrodeposition parameters and post heat treatment on the morphology, thickness, roughness and adhesion of..... More

      
777 Self-propagating High Temperature Synthesis of Quasi-nano sized CuxNiyZn1-x-yFe2O4 with Numerical Modeling by Finite Element Method
유한요소법에 의한 수학적 모델링을 활용한 준-나노 CuxNiyZn1-x-yFe2O4 페라이트 연소합성
Moon Sun Gu, Yong Choi
구문선, 최용
Korean J. Met. Mater. 2017;55(11):777-782.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.777

Abstract
Numerical modeling of the self-propagating high temperature synthesis (SHS) of CuxNiyZn1-x-yFe2O4 ferrites was carried out using the finite element method, to control the combustion synthesis behaviors of the ferrites. Additional pre-heating above 300 ℃ caused the combustion temperature at the inner surface of the reactant compact to completely propagate the..... More

      
783 Fabrication and Mechanical Properties of WC Alloy Hard Materials by a Pulsed Current Activated Sintering Method
펄스통전활성 소결법 적용 WC 합금 소결체 제조 및 기계적 특성 평가
Jeong-Han Lee, Hyun-Kuk Park, Jun-Ho Jang, Sung-Kil Hong, Ik-Hyun Oh
이정한, 박현국, 장준호, 홍성길, 오익현
Korean J. Met. Mater. 2017;55(11):783-789.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.783

Abstract
In this study, planetary ball milled WC-5 wt%Co powders were sintered using the pulsed current activated sintering (PCAS) process. With this process, fully densified hard materials were obtained in a shorter time than conventional processes such as a HP and HIP. The particle sizes of the planetary ball milled WC..... More

      
790 Effect of Diamond Particle Size on the Microstructure and Wear Property of High Pressure High Temperature (HPHT) Sintered Polycrystalline Diamond Compact (PDC)
초 고온・고압 소결된 다결정 다이아몬드 컴팩트의 미세조직 및 마모 특성에 미치는 다이아몬드 입자 크기의 영향
Min-Seok Baek, Hee-Sub Park, Jae-il Lee, Kee-Ahn Lee
백민석, 박희섭, 이재일, 이기안
Korean J. Met. Mater. 2017;55(11):790-797.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.790

Abstract
A polycrystalline diamond compact (PDC) is a two-stage sintered body manufactured by placing diamond powders on a WC-Co hard material and then applying the high pressure high temperature (HPHT) sintering process. This study investigated the microstructure and wear properties of the PDC depending on initial diamond particle size. Three different..... More

      
798 Effect of Current Densities on the Electromigration Failure Mechanisms of Flip-Chip Sn-Ag Solder Bump
전류밀도에 따른 플립칩 Sn-Ag 솔더 범프의 Electromigration 손상기구 분석
Gahui Kim, Kirak Son, Gyu-Tae Park, Young-Bae Park
김가희, 손기락, 박규태, 박영배
Korean J. Met. Mater. 2017;55(11):798-805.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.798

Abstract
The effect of current densities on the electromigration (EM) failure mechanism of flip chip Cu/Ni/Sn-Ag/Cu solder bumps was investigated under stressing conditions at current densities ranging from 5.0~6.9 × 103 A/cm2 at 150 ℃. The EM failure times at 5.0 × 103 A/cm2 were around 11 times longer than at..... More

      
806 Role of Voltage and Gas Pressure in Determining the Mean Diameter of Sn-Bi-Ag Intermetallic Compound Nanoparticles Formed by Pulsed Wire Discharge
Dae Geol Jeong, Jae Min Cha, Dae Sung Kim, Ju Hyeong Kim, Hwa Jin Jeong, Jae Young Shin, Jun Hyeon Bae, Bong Ki Ryu, Hisayuki Suematsu, Kenta Tanaka
Korean J. Met. Mater. 2017;55(11):806-812.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.806

Abstract
Nanoscale Sn-Bi-Ag compound powders were successfully synthesized using the pulsed wire discharge (PWD) method. In PWD, when a high current is passed through high-density metal wires, the wires explode because of resistance heating, forming fine particles or metal vapor. In this study, we used Sn-Bi and Ag wires in order..... More

      
813 Design of a Silicon Fresnel Lens for Optimized Light Coupling in a Transmitter Optical Subassembly
실리콘 프레넬 렌즈 기반 트랜스미터 광모듈의 광정렬 설계 및 특성 향상 연구
In Yup Hwang, Jun-Seok Ha, Sang-Wan Ryu
황인엽, 하준석, 류상완
Korean J. Met. Mater. 2017;55(11):813-818.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.813

Abstract
The silicon microlens is a key element in advanced optical packaging. However, the difficulty of its fabrication process and low yield have hindered the development of an silicon lens based optical device module. A silicon Fresnel lens was studied using ray tracing optical simulation, because its small sagittal height allows..... More

      
819 Characteristics of NiO・YSZ Gas Sensor Employing YSZ Solid Electrolyte Prepared by Thermal Spray Coating Method
용사코팅 YSZ 고체 전해질이 응용된 NiO・YSZ 가스센서의 특성
Il-Hwan Bang, Sung-Yong Cho
방일환, 조성용
Korean J. Met. Mater. 2017;55(11):819-824.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.819

Abstract
A mixed potential-type NiO・YSZ (yttria stabilized zirconia) gas sensor employing 8YSZ solid electrolyte film was fabricated using a thermal spray coating method, and tested in a NO2 atmosphere at various operating temperatures. The thermal spray coating method is useful for mass producing solid electrolytes without a forming, sintering or bonding..... More

      
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