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The Effect of Rolling Reduction on the Microstructure Evolution and Slip Behavior of Ta-10W Alloy during Cold Rolling Process
냉간 압연 시 Ta-10W 합금의 미세조직 변화 및 슬립 거동에 미치는 압하율의 영향
Ki-Seong Park, Lalit Kaushik, Hyo-Sang Yoo, Jae-Yeol Jeon, Shi-Hoon Choi
박기성, Lalit Kaushik, 유효상, 전재열, 최시훈
Korean J. Met. Mater. 2024;62(6):429-444.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.429

Abstract
In this study, we investigated the influence of cold rolling reduction on microstructural evolution and slip behavior in Ta-10W alloy fabricated by vacuum arc melting (VAM). As the reduction increased, both single and multiple slips were observed within some grain interiors. At reductions of 20% and 40%, deformation bands, primarily..... More

                
Hot Deformation Behavior of Inconel 718 Alloy Using Regression-based Dynamic Material Model and Applications in Ring Rolling Manufacturing
회귀기반의 동적재료모델을 이용한 Inconel 718 합금의 고온 변형 거동 분석 및 Ring rolling 공정의 적용
Seon Yeong Yang, Jin Wook Park, Jun Seok Yoon, Kwang Seok Lee, Dong-Geun Lee, Da Seul Shin
양선영, 박진욱, 윤준석, 이광석, 이동근, 신다슬
Korean J. Met. Mater. 2024;62(2):81-93.   Published online 2024 Jan 30
DOI: https://doi.org/10.3365/KJMM.2024.62.2.81

Abstract
Inconel 718 nickel-based alloy is extensively used in the aerospace industry (e.g., gas turbine engine components) because of its excellent corrosion resistance and high mechanical properties at elevated temperatures. However, there is a certain limit to manufacturing the alloy through plastic deformation due to its high deformation resistance and complicated..... More

                
Effect of Strain Rate on Deformation Behaviors of Ti-12.1Mo -1Fe Metastable Beta Alloy
Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
In Kyeong Jin, Dong-Geun Lee
진인경, 이동근
Korean J. Met. Mater. 2023;61(10):741-747.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.741

Abstract
The addition of expensive elements to β titanium alloys, which are widely used in the aerospace and automobile industries, causes their price to increase. Low-cost, high-strength alloy (Ti-12.1Mo-1.0Fe) was designed in this study and the compressive behaviors of this alloy were evaluated for application to automobile parts, etc. As a..... More

                
Effect of Grain Boundary Morphology on the High Temperature Tensile Properties of Developed Ni-Based Superalloy (LESS)
Ni기 초내열 개발 합금(LESS)의 고온 인장특성에 미치는 결정립계 형상의 영향
Yong Kwan Shin, Byung Il Kang, Jeong IL Youn, Yong Nam Kwon, Young Jig Kim
신용관, 강병일, 윤정일, 권용남, 김영직
Korean J. Met. Mater. 2022;60(12):940-949.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.940

Abstract
In order to investigate the mechanical properties of the developed wrought γ'-hardened Ni-based superalloy, LESS alloy (Low Eta Sigma Superalloy), and to understand the deformation behavior, tensile tests were carried out from room temperature to 800oC in comparison with IN 740H alloy. Like other superalloys, the tensile properties of the..... More

                   Web of Science 4  Crossref 6
Effect of Initial Microstructure on the High-Temperature Formability of STS 321 Alloy Using a Dynamic Material Model
동적재료모델을 활용한 STS 321 스테인리스강의 고온성형성 평가와 초기 미세조직의 영향
Pyeong-Seok Jo, Jae-Gwan Lee, Hyo-Woon Hwang, Yong-Jae Lee, Dong-Geun Lee
조평석, 이재관, 황효운, 이용재, 이동근
Korean J. Met. Mater. 2022;60(12):892-901.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.892

Abstract
General austenitic stainless steel has a problem with intergranular corrosion due to volatilizing chromium, which forms chromium carbide in a high temperature environment. By adding titanium as an alloying element, STS 321 stainless steel has excellent creep resistance and intergranular corrosion resistance at high temperatures, because the formation of chromium..... More

                   Web of Science 2  Crossref 2
Evaluation and Prediction of Formation of Heat-Affected Zone and Mechanical Properties According to Welding Method of STS 316L/A516-70N Clad Plates
STS 316L/A516-70N 클래드 판재의 용접방법에 따른 열영향부 형성과 기계적 물성 특성 평가 및 예측
Cheolhong Hwang, Myungwoo Joe, Sunhwan Kim, Doohee Han, Kyunghoon Yoo, Sungwoong Kim, Youngjoo Kim, Sangyeob Lee, Joonsik Park
황철홍, 조명우, 김선환, 한두희, 유경훈, 김성웅, 김영주, 이상엽, 박준식
Korean J. Met. Mater. 2022;60(12):873-883.   Published online 2022 Nov 25
DOI: https://doi.org/10.3365/KJMM.2022.60.12.873

Abstract
Two welding methods of FCAW (Flux-cored arc welding) + FCAW, and FCAW + GTAW (Gas tungsten arc welding) were compared to identify effective routes for STS 316L/A516-70N clad stainless steel. Since the welding speed of the FCAW + GTAW welding method is slower than that of the FCAW + FCAW..... More

                   Web of Science 4  Crossref 4
Mechanical and Microstructural Behaviors of Gas Tungsten Arc Dissimilar Metal Welds of High-Mn Steel and Stainless Steel 316L Using Various Fillers for Cryogenic Fuel Tanks
극저온 연료탱크용 고망간강과 스테인리스강 316L 이종금속 용접부의 가스텅스텐아크 용접재료별 기계적 성질 및 미세조직
Chulho Cho, Seongkil Nam, Sunghoon Yu, Myeonghwan Choi, Namhyun Kang
조철호, 남성길, 유성훈, 최명환, 강남현
Korean J. Met. Mater. 2022;60(9):673-684.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.673

Abstract
The gas tungsten arc (GTA) weldability of high-Mn (HMn) steel and austenitic stainless steel (STS) 316L using dissimilar metal welds (DMWs) was investigated, to fabricate a fuel tank for an LNG-fueled ship. Three types of welding fillers, HMn steel, STS 309LMo and Inconel 625, were applied to the DMWs. The..... More

                   Web of Science 4  Crossref 4
Hydration Deformation Behaviors of Scaffolds of Tricalcium Silicate/Tricalcium Aluminate Mixtures Printed Using the Fused Deposition Modelling (FDM)
Yeongjin Koo, Myung-Hyun Lee, Seog Young Yoon, Yoonjoo Lee
구영진, 이명현, 윤석영, 이윤주
Korean J. Met. Mater. 2022;60(4):321-328.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.321

Abstract
3D printing technology has advanced rapidly over the last decade. However, for ceramic materials, drying and sintering steps are required after printing, and excessive shrinkage that occurs during these steps is a major factor that has hindered the development of the ceramic 3D printing technology. In this study, a non-sintering..... More

                   Web of Science 1  Crossref 1
Development of Light-Weight TRIP/TWIP FCC High Entropy Alloy with High Specific Strength and Large Ductility
고비강도와 고연신을 가지는 다중변형기구 하이엔트로피 합금 개발
Kook Noh Yoon, Hyun Seok Oh, Je In Lee, Eun Soo Park
윤국노, 오현석, 이제인, 박은수
Korean J. Met. Mater. 2021;59(12):857-869.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.857

Abstract
In this study we developed a novel (TRIP+TWIP) high entropy alloy (HEA) with high specific strength and large ductility. First, by controlling the atomic constitution of the 3d transition metals (Cr, Mn, Fe, Co, and Ni), we designed a light-weight TRIP-assisted dual-phase HEA with a non-equiatomic composition of Cr22Mn6Fe40Co26Ni6, which..... More

                   Web of Science 1  Crossref 1
A Study on the Effect of Multi-Axial Forging Type on the Deformation Heterogeneity of AA1100 Using Finite Element Analysis
유한요소해석을 이용한 AA1100의 변형 불균일성에 미치는 다축 단조 유형의 영향 연구
Min-Seong Kim, Jeong Gyun Kim, Tae Hyun Yoo, You Yeon Jo, Seong Lee, Hyo-Tae Jeong, Shi-Hoon Choi
김민성, 김정균, 유태현, 조유연, 이성, 정효태, 최시훈
Korean J. Met. Mater. 2021;59(9):624-639.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.624

Abstract
The effect of 3 forging routes (Route A - 1~12 passes by plane forging (PF) and reverse-plane forging (R-PF), Route B – 1~6 passes by PF and R-PF, 7~12 passes by diagonal forging (DF) and reversediagonal forging (R-DF), Route C – 1~12 passes by DF and R-DF) on maximum load..... More

                   Web of Science 6  Crossref 6
Tensile and Compressive Deformation Behaviors of High-Strength Cu Bulk Material Manufactured by Cold Spray
저온 분사 공정으로 제조된 초고강도 Cu 벌크 소재의 인장 및 압축 변형 거동
Young-Kyun Kim, Kee-Ahn Lee
김영균, 이기안
Korean J. Met. Mater. 2020;58(11):759-767.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.759

Abstract
In this study, high-strength pure Cu bulk material was manufactured using a cold spray additive manufacturing process, and its microstructure, tensile and compressive deformation behaviors were investigated and compared. The cold spray additive manufactured Cu bulk material showed a heterogeneous grain structure consisting of fine-grains and coarse-grains, and only α..... More

                   Web of Science 1  Crossref 1
Effects of Initial Precipitate on Shear Deformation during Asymmetric Rolling of Al-Mg-Si Alloy: Texture and Formability
Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성
Wonkee Chae, Bong-Kyu Kim, Jongbeom Lee, Jun Hyun Han
채원기, 김봉규, 이종범, 한준현
Korean J. Met. Mater. 2020;58(10):703-714.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.703

Abstract
Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value..... More

                   Web of Science 8  Crossref 8
Precise Flow Stress Analysis for the Occurrence of Dynamic Ferritic Transformation and Dynamic Recrystallization of Austenite in Low Carbon Steel
고온 변형 곡선을 이용한 동적 재결정 해석과 동적 상변태의 조기 예측
Nokeun Park
박노근
Korean J. Met. Mater. 2018;56(11):779-786.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.779

Abstract
There have been previous attempts to observe the occurrence of dynamic ferritic transformation at temperatures even above Ae3 in a low-carbon steel, and not only in steels, but recently also in titanium alloys. In this study, a new approach is proposed that involves treating true stress-true strain curves in uniaxial..... More

                   Crossref 1
Investigation of Local Deformation Behaviour of Metallic Materials and Recent Research Trends: A Review
금속 재료의 국부 변형 거동 분석 방법과 연구 동향: 리뷰
Min-su Lee, Jong Bae Jeon, Tea-Sung Jun
이민수, 전종배, 전태성
Korean J. Met. Mater. 2018;56(9):635-644.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.635

Abstract
The behaviour and performance of complex metallic materials (e.g., advanced high strength steel and dual phase Ti alloys) are acknowledged to be multi-scale in nature and to rely on the details of the threedimensional morphology, chemistry and crystallography at the meso-scale level and on macro-scale level geometry and boundary and..... More

                   Crossref 6
Inhomogeneous Deformation of Interstitial Free Steel during the High Pressure Torsion Process
Yuepeng Song, Miaomiao Chen, Wenke Wang, Baoyan Xu, Dongsheng Gao, Shuai Zhang, Hyoung Seop Kim
Korean J. Met. Mater. 2017;55(10):710-715.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.710

Abstract
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation..... More

    
Microstructure and High Temperature Plastic Deformation Behavior of Al-12Si Based Alloy Fabricated by an Electromagnetic Casting and Stirring Process
전자기주조법으로 제조된 Al-12Si계 합금의 미세조직 및 고온 소성변형 거동
Kyung-Soo Jeon, Heung-Ryeol Roh, Mok-Soon Kim, Jong-Ho Kim, Joon-Pyo Park
전경수, 노흥렬, 김목순, 김종호, 박준표
Korean J. Met. Mater. 2017;55(6):386-395.   Published online 2017 Jun 1
DOI: https://doi.org/10.3365/KJMM.2017.55.6.386

Abstract
An as-received EMC/S (electromagnetic casting and stirring)-processed Al-12Si based alloy billet was homogenized to examine its microstructure and high temperature plastic deformation behavior, using compressive tests over the temperature range from 623 to 743 K and a strain rate range from 1.0×10-3 to 1.0×100s-1. The results were compared with samples..... More

    
The Effects of Cooling Rate on Deformation Mechanism at Room Temperature in Mild Steel
연강에서 상온 변형 기구에 미치는 냉각 속도의 영향
SungSoo Kim, Yoon Sang Lee, Young Suk Kim
김성수, 이윤상, 김영석
Korean J. Met. Mater. 2016;54(12):875-884.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.875

Abstract
The deformation mechanism at room temperature in water quenched (WQ) and furnace cooled (FC) mild steels was investigated in a plane tilted 45° from the tensile direction, using electron back scattered diffraction, XRD, and TEM. The occurrence of (211) twinning was confirmed by pole figures and the slip systems were..... More

    
Effects of Friction and Anvil Design on Plastic Deformation during the Compression Stage of High-Pressure Torsion
Yuepeng Song, Miaomiao Chen, Baoyan Xu, Dongsheng Gao, Jing Guo, Lingfeng Xu, Zheng Wang, Hyoung Seop Kim
Korean J. Met. Mater. 2016;54(11):831-837.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.831

Abstract
Herein, we report the results of our investigation on the effect of friction and anvil design on the heterogeneous plastic-deformation characteristics of copper during the compressive stage of high-pressure torsion (HPT), using the finite element method. The results indicate that the friction and anvil geometry play important roles in the..... More

       Crossref 3
Effect of Strength Coefficient of Bainite on Micromechanical Deformation and Failure Behaviors of Hot-Rolled 590FB Steel during Uniaxial Tension
열연 590FB강의 일축인장 시 미소역학적 변형거동 및 파괴거동에 미치는 베이나이트의 강도계수의 영향
Eun-Young Kim, Sung Il Kim, Shi-Hoon Choi
김은영, 김성일, 최시훈
Korean J. Met. Mater. 2016;54(11):808-816.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.808

Abstract
The effect of the strength coefficient (KB) of bainite on micromechanical deformation and failure behaviors of a hot-rolled 590MPa steel (590FB) during uniaxial tension was simulated using the elasto-plastic finite element method (FEM). The spatial distribution of the constituent phases was obtained using a phase identification technique based on optical..... More

       Crossref 6
Materials Analysis & Characterization
Transmission Electron Microscopic Analysis of Micro-Twin
미세쌍정의 투과전자현미경 해석
Kun Kul Ryoo, Mi-young Ha, Kang Deuk Lee
류근걸, 하미영, 이강득
Korean J. Met. Mater. 2016;54(9):711-715.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.711

Abstract
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking..... More

       Crossref 2
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