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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

                        
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

                        
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

         Cited By 2
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

         Cited By 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

         Cited By 1
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