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Table of Contents | June, 2019  Vol. 57   No.6 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
335 Influence of Carbon Content and Isothermal Heat Treatment Temperature on the Microstructure and Mechanical Properties of Ultra-High Strength Bainitic Steels
초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
Seung Hwangbo, Hong-Bum Lee, Young-Beum Song, Jinhee Ham, Hong-Kyu Kim, Dong-Woo Suh
황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater. 2019;57(6):335-342.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.335

Abstract
The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but..... More

                        
343 Effect of Ni and Cu Addition on Corrosion Behaviors of Pre-Oxidized Ultra-Strong Steel for Automotive Applications
Ni 및 Cu 첨가가 고온 산화된 자동차용 초고강도 강재의 부식 거동에 미치는 영향
Seung Min Ryu, Hwan Goo Seong, Jeong Kil Kim, Joong-Ki Hwang, Man Jae Lee, Min-Suk Oh, Sung Jin Kim
류승민, 성환구, 김정길, 황중기, 이만재, 오민석, 김성진
Korean J. Met. Mater. 2019;57(6):343-351.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.343

Abstract
The incomplete elimination of oxide scale formed during the normalizing process can result in severe degradation of the surface and mechanical properties of ultra-strong steels. This study revealed that the formation of oxide scale was highly dependent upon the alloying elements Ni and Cu. Ni-bearing steel showed a much higher..... More

                        
352 Visualization of Magnetic Domains in Electrical Steel Using High-Resolution Dark-Field Imaging
Youngju Kim, Jongyul Kim, Daniel Seth Hussey, Oh Youl Kwon, Seung Wook Lee
Korean J. Met. Mater. 2019;57(6):352-359.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.352

Abstract
Electrical steel is a soft magnetic steel material used in electric devices such as transformers and motors. The performance of these electric devices is primarily related to the magnetic properties of electrical steel, and the assessment of the magnetic properties of electrical steel has been considered an important topic. We..... More

                        
360 Study on the Optimum Conditions for Synthesizing a Cathode Active Material Precursor in Li-Ion Batteries Using a Taylor Reactor
테일러 반응기를 이용한 최적의 리튬이차전지용 양극활물질 전구체 합성 조건 선정을 위한 연구
Deokhyun Han, Iljeong Park, Minjun Kim, Daeweon Kim, Hangchul Jung
한덕현, 박일정, 김민준, 김대원, 정항철
Korean J. Met. Mater. 2019;57(6):360-365.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.360

Abstract
Li(Ni1-x-yCoxMny)O2 (NCM) materials, which are the cathode active material for lithium ion batteries, have been developed and widely used as an alternative to lithium cobalt oxide, because of the high cost of cobalt. To synthesize high quality NCM materials, it is important to control the process manufacturing of the NCM..... More

                        
366 Synthesis and Thermoelectric Properties of (La1−zNdz)0.8Fe4−xCoxSb12 Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2019;57(6):366-373.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.366

Abstract
p-Type (La1−zNdz)0.8Fe4−xCoxSb12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe. The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified. Partial filling within the filling fraction limit..... More

                        
374 Effects of Al, V, Cr, Mn, Ni, Nb, Mo, and W Addition to BCC-Fe on its Elastic Properties and Hardness for a Biomass Boiler: First Principles Approaches
Al, V, Cr, Mn, Ni, Nb, Mo 및 W 첨가에 따른 바이오매스 보일러용 BCC-Fe의 탄성 특성과 경도 변화의 이론적 고찰
Jiwoong Kim, MyungJae Kim, Chang Yul Seo, Jungho Ryu, Taegong Ryu, Hye-Jin Hong, Doyeon Shin, Yong Jae Suh
김지웅, 김명재, 서창열, 류정호, 류태공, 홍혜진, 신도연, 서용재
Korean J. Met. Mater. 2019;57(6):374-380.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.374

Abstract
During biomass combustion for renewable energy generation, combustion byproducts such as fly ash and metal chlorides cause serious erosion problems in boilers, as well as corrosion. To develop a highly wear-resistant composition of alloy for biomass boilers, we investigated how the addition of various metallic elements to BCC-Fe affected its..... More

                        
381 Study on Shape Optimization of Automotive Door Impact Beam for Light Weight Design and Improved Crash Performance
자동차 도어보강재의 경량화 및 충돌특성 향상을 위한 형상 최적화 연구
Woochang Jeong
정우창
Korean J. Met. Mater. 2019;57(6):381-389.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.381

Abstract
A study on shape optimization of a hot-stamped automotive door impact beam for lightweight design and improved crash performance was conducted using a static collision analysis based on FMVSS 214. An integral type one-piece door impact beam of bracket parts and pipe was realized using hot stamping technology. The method..... More

                        
390 Tin Microcrystals Synthesized by Thermal Chemical Vapor Deposition in a Hydrogen-Reducing Atmosphere
Daseul Ham, Won Jeong, Hyon Chol Kang
Korean J. Met. Mater. 2019;57(6):390-395.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.390

Abstract
We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment..... More

                        
396 Effect of Pre-Aging Treatment on Bake-Hardenability of Al-8.0Zn-2.5Mg-2.0Cu Alloy Sheet Fabricated by Twin-Roll Casting Process
박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
Ji-Goo Heo, Yun-Soo Lee, Min-Seok Kim, Hyoung-Wook Kim, Yang-Do Kim
허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater. 2019;57(6):396-404.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.396

Abstract
The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet..... More

                        
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