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Prediction and Validation of Stress Triaxiality Assisted by Elasto-Visco-Plastic Polycrystal Model
탄점소성 다결정 모델을 활용한 삼축성 예측 및 검증
Jinhwa Park, Youngung Jeong
박진화, 정영웅
Korean J. Met. Mater. 2022;60(8):607-618.   Published online 2022 Jul 19
DOI: https://doi.org/10.3365/KJMM.2022.60.8.607

The ΔEVPSC numerical code based on the elasto-visco-plastic HEM (Homogeneous Effective Medium) provides a multiscale constitutive modeling framework that is suitable for describing a wide range of mechanical behaviors of polycrystalline metals. In this study, an AA6061-T6 aluminum sample was chosen to validate the predictive capability of the ΔEVPSC stand-alone..... More

The Effect of Preheating Current on the Melting Behavior of Bolt Projection Welding of Al-Si Coated Hot-Stamped Boron Steel
Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
Jae-Hun Kim, Hyun-Uk Jun, Joo-Yong Cheon, Jae-won Kim, Jae-deuk Kim, Changwook Ji
김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater. 2021;59(12):893-903.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.893

This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection..... More

Method for Predicting Thermoelectric Module Efficiency Using MATLAB/Simulink
매트랩/시뮬링크 simulation model을 이용한 열전 모듈의 효율 예측
Nayoung Lee, Sungwook Ye, Rahman Jamil Ur, Jang-Yeul Tak, Jung Young Cho, Won Seon Seo, Weon Ho Shin, Walter Commerell, Woo Hyun Nam, Jong Wook Roh
이나영, 예성욱, Rahman Jamil Ur, 탁장렬, 조중영, 서원선, 신원호, Walter Commerell, 남우현, 노종욱
Korean J. Met. Mater. 2021;59(11):829-837.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.829

Development new high-performance thermoelectric materials for more efficient power generation systems and eco-friendly refrigerating systems has been challenging. Over the past few decades, thermoelectric studies have been focused on increasing the thermoelectric properties of materials. However, for conventional applications, developing of thermoelectric devices or modules with lower cost and..... More

Evaluation of Cooling Performance of an Additive Manufactured Gravity Die Casting Mold with Conformal Cooling Channel
적층제조 공정으로 구현된 형상 적응형 냉각채널 적용 다이캐스팅 금형의 냉각성능 평가
Yu Jin Park, Eok Soo Kim, Jeong Hun Lee, Ji Hwan Choi, Pil Hwan Yoon, Ho Jeong Kang, Dong Hyun Kim, Yong Ho Park, Jong Wan Ko
박유진, 김억수, 이정훈, 최지환, 윤필환, 강호정, 김동현, 박용호, 고종완
Korean J. Met. Mater. 2021;59(9):652-663.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.652

A cooling channel with an optimized design provides not only high throughput with gravity die casting, but also guarantees product quality. A conformal cooling channel (CC) whose structure follows the shapes or surfaces of the mold cavity has attracted great attention in the die casting industry, because it allows rapid..... More

Investigation of Structure-Property Relations in Porous Metals Using Finite Element Simulation
유한요소해석을 활용한 다공 금속의 구조-물성 관계 연구
Dongmyung Jung, Yongwoo Kwon
정동명, 권용우
Korean J. Met. Mater. 2019;57(11):747-754.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.747

A porous material can be regarded as a mixture of pores and solid phases, with effective thermal and mechanical properties that significantly differ from those of its base material. Material effective properties depend greatly on the structure and porosity. The effective properties of materials with different pore structures can vary..... More

Computational Design of Highly Efficient and Robust Hole Transport Layers in Perovskite Solar Cells
페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
Jiyoung Jeong, Dongjun Song, Jihye Choe, Choong-Heui Chung, Ki-Ha Hong
정지영, 송동준, 최지혜, 정중희, 홍기하
Korean J. Met. Mater. 2019;57(8):535-542.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.535

We investigated the effects of materials and the film thickness of hole transport layers (HTLs) on inverted type perovskite solar cells using optics-charge transport coupled simulations. Power conversion efficiencies (PCEs), and the variations in efficiency induced by the film thickness dispersion, were intensively studied, to compare potential HTLs candidates like..... More

                           Cited By 3
Effect of Process Parameters on the Angular Distribution of Sputtered Cu Flux in Long-Throw Sputtering System
Hee-Young Shin, Tae-Ho Kim, Jun-Woo Park, Hyun-Chul Sohn
Korean J. Met. Mater. 2019;57(7):462-467.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.462

In this work, the angular distribution of the sputtered Cu flux in a long throw sputtering (LTS) system is extracted from the comparison of experimentally-measured profiles of deposited films with simulated profiles of films in overhang contact structure. And effects of the sputtering process parameters such as Ar pressure during..... More

                           Cited By 1
Effect of Carbides Formed in 9Cr-1Mo-V-Nb Weld Metals on Elevated Temperature Tensile Strength
9Cr-1Mo-V-Nb 용착금속에서 생성된 탄화물이 고온 인장강도에 미치는 영향
Byungrok Moon, Junghoon Lee, Namhyun Kang, Taeho Lee, Woosang Jung, Chulgyu Park, Kyungmox Cho
문병록, 이정훈, 강남현, 이태호, 정우상, 박철규, 조경목
Korean J. Met. Mater. 2019;57(7):422-429.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.422

Alloy design of 9Cr-1Mo-V-Nb weld metals was carried out through thermodynamic simulation, and elevated temperature tensile testing was performed on the designed alloy. Based on the thermodynamic simulation of the 9Cr-1Mo-V-Nb weld metal, 0.09 to 0.10 wt% C was added to increase Cr-rich M23C6. Nitrogen was reduced from 0.04 to..... More

Pressure Transmission in the Compaction Process of Nickel Powder Using the Finite Element Methods
Jong Won Baek, Seong Jin Park
Korean J. Met. Mater. 2019;57(2):115-123.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.115

The compression process is one of the more widely used industrial manufacturing methods for fabricating desired shape of specimens with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, then achieving densification. In this process,..... More

Analysis of a Slab and Slab Heater Cover in a Compact Endless Cast and Rolling Mill Process Using Finite Element Methods
Jong Won Baek, Joo Won Oh, Jae-Sook Chung, Yong-Seok Cho, Seong Jin Park
백종원, 오주원, 정제숙, 조용석, 박성진
Korean J. Met. Mater. 2019;57(1):43-50.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.43

Compact Endless cast and rolling Mill (CEM) processes were developed and used to fabricate steel products such as steel slabs. However, the coiling furnace in this process was very expensive, so a new layout was suggested. As the coiling furnace was removed, the interval among the slab heaters had to..... More

Modification of the Amount of CH<sub>4</sub> Supplied for the Efficient CH<sub>4</sub> Reduction of SnO<sub>2</sub>
Taeyang Han, Youhan Sohn, Hyunwoo Ha, Mi Yoo, Sangyeol Kim, Sang-ro Lee, Hyun You Kim, Jun Hyun Han
Korean J. Met. Mater. 2018;56(5):384-391.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.384

The methane reduction (MR) of SnO2 has been proposed as a highly efficient method for recovering Sn from SnO2 containing industrial wastes. The MR of SnO2 also produces a mixture of H2 and CO, which can be further utilized as a syngas for the production of various fuels through the..... More

         Cited By 2
How to Utilize Computational Materials Science in the Metals and Materials Community An Overview
금속·재료 분야 전산재료과학 사용설명서
Byeong-Joo Lee
Korean J. Met. Mater. 2018;56(4):253-264.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.253

Computational approaches such as first-principles calculations, atomistic simulations, phase field simulations, computational thermodynamics and finite element method simulations are widely used in the metals and materials community. Even with their successful applications for better understanding of material phenomena, and the design of new materials or processes, a gap remains between..... More

Heat Dissipation Analysis of High-Power, Multi-Chip LED Bulbs
고 출력, 멀티 칩 LED 벌브에서 방열 거동 해석
Cheol-Hee Moon
Korean J. Met. Mater. 2018;56(3):227-234.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.227

To ensure the reliability of high-power light-emitting diode (LED) bulbs, temperature management is very important, including reduction of the junction temperature on the LED chip and enhancing outward thermal dissipation. Simulation can be an effective tool for predicting the temperature distribution over all bulbs, which enables a quantitative analysis. In..... More

Charging Behavior of Sinter Feed according to Types of Charging Chute
장입 슈트 형태에 따른 소결 원료 장입 거동
Kang-Min Kim, Ki-Woo Lee, Jae-Hong Kwon, Hae-Kwon Jeong, Jeong-Whan Han
김강민, 이기우, 권재홍, 정해권, 한정환
Korean J. Met. Mater. 2017;55(12):896-904.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.896

In the iron ore sintering process, a thermal imbalance can occur in the sinter feed bed which degrades the quality of the sintered ores. In order to solve this thermal imbalance, it is necessary to control the sizes of the sintering feed charging through the chute by designing an appropriate..... More

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

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

         Cited By 1
Effect of Overflow Geometry and Injection Speed on the Casting Product during the Magnesium Alloy Die-casting Process for Thin-walled Electronic Housing Components
마그네슘 합금 박육 부품 다이캐스팅 주조시 오버플로우 형상 및 주입속도가 주조 품질에 미치는 영향
Eui-Hyuk Kwon, Jaehong Kwon, Beyong-Chul Kim, Jeong-Whan Han
권의혁, 권재홍, 김병철, 한정환
Korean J. Met. Mater. 2017;55(7):515-522.   Published online 2017 Jul 4
DOI: https://doi.org/10.3365/KJMM.2017.55.7.515

Casting defects such as gas traps and oxide particles must be removed in the die-casting process in order to obtain good cast products. Experimental research is costly and time-consuming, so computer simulations are typically performed in advance and then compared to experimental results. In this paper, a magnesium alloy die-casting..... More

Calculation of Inductance, Capacitance, and Microwave Absorbance of Modified Square Loop Frequency Selective Surface
변형된 사각 루프 주파수 선택 표면의 인덕턴스, 커패시턴스 계산 및 전파흡수특성
Tian Liu, Sung-Soo Kim
류전, 김성수
Korean J. Met. Mater. 2017;55(6):412-418.   Published online 2017 Jun 1
DOI: https://doi.org/10.3365/KJMM.2017.55.6.412

The square loop (SL) is the typical pattern of a frequency selective surface (FSS) with high inductance (L) and capacitance (C). In this study, modified patterns including split square loop FSS (SSL-FSS) and I-type FSS (I-FSS) are proposed, and their L and C values were estimated using the equivalent circuit..... More

         Cited By 1
Simulation and Experimental Study on the Steady Conduction Solution for Continuous Rheo-Casting for A356 Alloy
Do Minh Duc, Nguyen Hong Hai, Pham Quang
Korean J. Met. Mater. 2017;55(3):202-208.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.202

Computational fluid dynamic modeling of a continuous rheo-casting technology was conducted, consistent with the manufacturing of 3 mm-thin plates made of aluminum alloy A356. The A numerical simulation on of the stabilizing time of the material crystallization was carried out using the ANSYS FLUENT code. Solidification and melting models were..... More

Study of Novel EUV AbsorberNickel & Nickel Oxide
새로운 EUV 흡수체 연구:니켈 & 니켈 산화물
Dong Gon Woo, Jung Hwan Kim, Jung Sik Kim, Seongchul Hong, Jinho Ahn
우동곤, 김정환, 김정식, 홍성철, 안진호
Korean J. Met. Mater. 2017;55(3):198-201.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.198
The shadowing effect is one of the most urgent issues yet to be solved in high-volume manufacturing using extreme ultraviolet lithography (EUVL). Many studies have been conducted to mitigate the unexpected results caused by shadowing effects. The simplest way to mitigate the shadowing effect is to reduce the thickness of... More
         Cited By 1
Effect of Side Lobe Intensity and Photon Shot Noise Effect on the Missing Hole Phenomenon in Extreme Ultraviolet Lithography
극자외선 노광공정에서의 사이드 로브 세기와 포톤 샷 노이즈 효과가 컨택 홀 missing 현상에 미치는 영향
Jung Sik Kim, Seongchul Hong, Yong Ju Jang, Jinho Ahn
김정식, 홍성철, 장용주, 안진호
Korean J. Met. Mater. 2017;55(2):139-143.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.139

The missing hole phenomenon in a wafer pattern is a critical issue in extreme ultraviolet lithography. It occurs randomly, even when the process conditions are consistent. The main reason for this phenomenon is thought to be the photon shot noise effect, which is a random reaction between photons and photoresist..... More

Numerical and Experimental Analysis on the Cavity Formation and Shrinkage for Investment Cast Alloy 738 4 mm-Thick Rectangular Tube
Alloy 738 초내열합금 4 mm 두께 각관의 정밀주조 시 수축공 및 수축변위 해석 및 분석
Myeong-Il Park, Kyeong-Min Kim, Yeong-Chul Lee, Jung-Seok Lee, Jae-Hyun Lee, Jae-Hyun Yoo, Sang-Hu Park, Yoon Suk Choi
박명일, 김경민, 이영철, 이정석, 이재현, 유재현, 박상후, 최윤석
Korean J. Met. Mater. 2017;55(2):132-138.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.132

Investment casting for the thin (4 mm thick) rectangular tube (40 mm wide, 80 mm high and 200 mm long) was carried out numerically and experimentally for Alloy 738, which is a precipitation-hardened Ni-base superalloy. Two types of rectangular tubes, one with a regular array (10 mm by 10 mm..... More

Technical Developments and Trends of Earthquake Resisting High-Strength Reinforcing Steel Bars
내진용 고강도 철근의 제조와 기술 개발 동향
Byoungchul Hwang, Jae-Hyeok Shim, Myoung-Gyu Lee, Joonho Lee, Jun-Ho Jung, Bo-Sung Kim, Sung-Bin Won
황병철, 심재혁, 이명규, 이준호, 정준호, 김보성, 원성빈
Korean J. Met. Mater. 2016;54(12):862-874.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.862

Since reconstruction of old town in Korea requires high-rise and seismic design construction, many attentions have been paid to high strength seismic reinforced steel bar. In the present paper, technical developments and trends are summarized for developing next-generation seismic reinforced steel bar of grade 700 MPa. Steelmaking process requires high..... More

         Cited By 8
Experimental and Simulation Analysis of Hot Isostatic Pressing of Gas Atomized Stainless Steel 316L Powder Compacts
Dongguo Lin, Sangyul Ha, Youngho Shin, Dong Yong Park, Seong Jin Park, Sung Taek Chung, Ravi Bollina, Seongkyu See
Korean J. Met. Mater. 2016;54(10):732-742.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.732

In this work, both experimental and numerical studies were conducted to investigate the densification behavior of stainless steel 316L (STS 316L) powders during hot isostatic pressing (HIP), and to characterize the mechanical properties of HIPed specimens. The HIP experiments were conducted with gas atomized STS 316L powders with spherical particle..... More

         Cited By 5
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