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793 |
High Temperature Deformation and Continuous Dynamic Recrystallization Behaviors of AA6082 using Processing Maps
공정지도를 이용한 AA6082 합금의 연속 동적 재결정 및 고온 변형 거동
Sang-Min Lee, Ji-Woon Lee, Hyun-Jin Choi, Soong-Keun Hyun이상민, 이지운, 최현진, 현승균
Korean J. Met. Mater. 2016;54(11):793-801. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.793
Abstract
Torsion tests were performed on AA6082 samples to investigate their flow softening behavior and to determine optimum process conditions. Based on the experimental data and dynamic materials model, high strain processing maps were established which demonstrate the constitutive relationships among temperature, strain rate, strain and stress. The flow curves exhibited..... More
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802 |
The Effects of Cooling Rate on the Microstructure and Mechanical Properties of Ti40Zr10Cu36Pd14 Metallic Glass Matrix Composites
Ti40Zr10Cu36Pd14 비정질기지 복합재의 미세조직과 기계적 특성에 미치는 냉각속도의 영향
Seon Yong Park, Ka Ram Lim, Young Sang Na, Seong Eon Kim, Youn Suk Choi박선용, 임가람, 나영상, 김승언, 최윤석
Korean J. Met. Mater. 2016;54(11):802-807. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.802
Abstract
In this paper, we demonstrate that the microstructure and mechanical properties in the Ti 40Zr 10Cu 36Pd 14 alloy can be tailored by controlling the cooling rate during solidification. A lower cooling rate increases the volume fraction of crystalline phase such as B2 but decreases the free volume of the glassy matrix. The increase..... More
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808 |
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 Choi김은영, 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
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817 |
Effects of Induction Heat Bending and Heat Treatment on the Boric Acid Corrosion of Low Alloy Steel Pipe for Nuclear Power Plants
Ki-Tae Kim, Min-Chul Shin, Hyun-Young Chang, Heung-Bae Park, Gi-Ho Sung, Young-Sik Kim
Korean J. Met. Mater. 2016;54(11):817-825. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.817
Abstract
In many plants, including nuclear power plants, pipelines are composed of numerous fittings such as elbows. When plants use these fittings, welding points need to be increased, and the number of inspections also then increases. As an alternative to welding, the pipe bending process forms bent pipe by applying strain... More
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826 |
Synthesis and Rapid Sintering of Nanocrystalline CoTi-ZrO2 Composite
나노구조 CoTi-ZrO2 복합재료 합성과 급속소결
In-Jin Shon손인진
Korean J. Met. Mater. 2016;54(11):826-830. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.826
Abstract
CoTi and ZrO 2 nanopowders were mechanochemically synthesized from CoTiO 3 and Zr powders according to the reaction (2CoTiO 3 + 3Zr → 2CoTi + 3ZrO 2). The milled powders were then consolidated by pulsed current-activated sintering within two minutes under an applied pressure of 80MPa. The average hardness and fracture toughness of the..... More
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831 |
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
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838 |
Evolution of the Solidification Microstructures in Directionally Solidified CM247LC Rod
CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
Jeongseok Lee, Seokhwan Kown, Byunggwan Yoon, Byungmoon Chang, Yongil Jung, Jehyun Lee이정석, 권석환, 윤병관, 장병문, 정연길, 이재현
Korean J. Met. Mater. 2016;54(11):838-845. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.838
Abstract
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS..... More
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846 |
Effect of Basicity on the Reduction Behavior of Carbon Composite Iron Oxide Briquette
탄재내장 산화철 브리켓의 환원거동에 미치는 염기도 영향
Jae-Hong Kwon, Eui-Hyuk Kwon, Ki-Woo Lee, Kang-Min Kim, Ji-A Lee, Jeong-Whan Han권재홍, 권의혁, 이기우, 김강민, 이지아, 한정환
Korean J. Met. Mater. 2016;54(11):846-854. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.846
Abstract
The world is gradually running short of high quality iron resources. This forces ironmaking processes to focus on the use of low quality iron ores. Carbon composite iron oxide briquettes (CCB) are one of the alternative choices. CCB enables the utilization of low quality powdered iron ores and coal, and..... More
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855 |
Evaluation of Material Properties on the Inner Surface of Cr Plated Cladding Tube for Preventing Fuel-Cladding Chemical Interaction
FCCI 방지를 위한 내면 Cr 도금 피복관의 물성 평가
Jun Hwan Kim, Byoung Oon Lee, Jin Sik Cheon, Sung Ho Kim김준환, 이병운, 천진식, 김성호
Korean J. Met. Mater. 2016;54(11):855-861. Published online 2016 Nov 5 DOI: https://doi.org/10.3365/KJMM.2016.54.11.855
Abstract
Studies were carried out to apply electroplating technique to the inner surface of a nuclear fuel cladding tube to prevent a fuel-cladding chemical interaction (FCCI) in a sodium-cooled fast reactor (SFR). 20 μm thick Cr was uniformly plated onto the inner surface of a HT9 cladding tube with a 7.4... More
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