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Effect of Solution Temperature and Quench Delay on the Microstructure and Mechanical Properties of an Extruded Al-Mg-Si-Cu-Mn alloy
Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
Jisu Kim, Jeki Jung, Hyun-Seok Cheon, Byung-joo Kim, Cha-Yong Lim, Su-Hyeon Kim, Yoon Suk Choi
김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석
Korean J. Met. Mater. 2024;62(2):132-141.   Published online 2024 Jan 30
DOI: https://doi.org/10.3365/KJMM.2024.62.2.132

Abstract
The effect of solution temperature and quench delay on the microstructure and mechanical properties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanning calorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens were held at 500 and 540 oC, respectively, for 80 min for solutionizing..... More

                
Thermoelectric Properties of N-type Mg<sub>3</sub>La<sub>0.005</sub>Mn<sub>x</sub>SbBi Materials Doped with La and Mn
La과 Mn으로 이중 도핑된 n형 Mg3La0.005MnxSbBi의 열전특성
Sung-Jae Joo, JiHui Son, JeongIn Jang, Bok-Ki Min, Bong-Seo Kim
주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater. 2024;62(1):45-50.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.45

Abstract
Mg3Sb2-based n-type materials are consisted of earth-abundant elements and possess comparable thermoelectric properties with n-type Bi2Te3 at low temperatures, which make them promising candidates for cooling and power generation applications in terms of cost and performance. Substitution of Sb atom with chalcogen elements (Te, Se S) is a conventional method..... More

                
Alleviating Mn<sup>3+</sup> Dissolution in ZnMn<sub>2</sub>O<sub>4</sub> Cathode for the Extended Cyclability via Particle Size Increase
Zn-ion 배터리용 ZnMn2O4 양극재의 입자 크기 증가를 통한 Mn3+ 용출 완화로 수명 증가
Jae Young Park, Young Mook Choi, Sang-Eun Chun
박재영, 최영묵, 전상은
Korean J. Met. Mater. 2023;61(12):923-932.   Published online 2023 Nov 30
DOI: https://doi.org/10.3365/KJMM.2023.61.12.923

Abstract
ZnMn2O4 (ZMO) cathode possesses a high theoretical capacity of 224 mAh g-1 and high operating voltage (1.9 V vs. Zn2+/Zn) for aqueous Zn–ion batteries. However, the disproportionation reaction of Mn3+ leads to Mn dissolution in the ZMO cathode, deteriorating lifespan. In this study, we attempted to reduce Mn dissolution by..... More

                
Effects of Cr additions on Corrosion and Erosion-Corrosion Behaviors in the Weld Heat-Affected Zone of Hadfield Steel in Brine Environments
염수환경 내 해드필드강 용접열영향부의 부식 및 침식-부식 거동에 미치는 Cr 첨가의 영향
Seung Woo Jin, Jin Sung Park, Duck Bin Yun, Sang Chul Lee, Jong Kyo Choi, Min-Suk Oh, Sung Jin Kim
진승우, 박진성, 윤덕빈, 이상철, 최종교, 오민석, 김성진
Korean J. Met. Mater. 2023;61(12):883-895.   Published online 2023 Nov 30
DOI: https://doi.org/10.3365/KJMM.2023.61.12.883

Abstract
The corrosion and erosion-corrosion behaviors in the weld heat-affected zone (HAZ) of Hadfield steels with varying Cr contents (1, 2, and 3 wt%) were examined. Various experimental methods, including electrochemical polarization, impedance, and weight loss measurements, were utilized. Two types of isothermal heat treatments were conducted in a box furnace..... More

                
Effect of Cr addition on the Corrosion-Wear Behaviors of 18Mn(V, Mo) Steel in a Seawater Environment
해양구조용 18Mn(V, Mo)강 내 Cr 첨가가 해수환경 내 부식-마모 복합거동에 미치는 영향
Duck Bin Yun, Jin Sung Park, Sang Cheol Lee, Jong Kyo Choi, Sung Jin Kim
윤덕빈, 박진성, 이상철, 최종교, 김성진
Korean J. Met. Mater. 2023;61(9):633-641.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.633

Abstract
The objective of this study was to examine the wear-corrosion behavior of 18Mn(V, Mo) steel, which had a minor amount of Cr addition (< 3 wt%), in an artificial seawater environment, and compare it to conventional carbon steel. A variety of electrochemical experiments, including linear polarization resistance, impedance spectroscopy, and..... More

                   Web of Science 1  Crossref 2
Tensile testing at the Extremely Low Temperature of 6K : Microstructure and Mechanical Properties of a Fe-Mn-Cr Steel
6K 초극저온 인장 시험 : Fe-Mn-Cr 강의 미세조직 및 기계적 물성
Young-Kyun Kim, Ka-Ram Lim, Young-Sang Na
김영균, 임가람, 나영상
Korean J. Met. Mater. 2023;61(6):389-396.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.389

Abstract
Materials with superior cryogenic strength and good ductility are increasingly in demand for resident friendly liquid-hydrogen (20K) storage tanks. Additionally, the space industry also requires materials that retain excellent mechanical properties at extremely low temperatures. However, mechanical testing at such low temperatures is highly limited due to the difficulties in..... More

                   Crossref 2
Predicting Grain Structure in Continuously-Cast Stainless Steel Slab
연속주조 스테인리스강 슬라브의 결정립 조직 예측
Hee-Soo Kim, Ji-Joon Kim
김희수, 김지준
Korean J. Met. Mater. 2023;61(1):60-68.   Published online 2022 Dec 28
DOI: https://doi.org/10.3365/KJMM.2023.61.1.60

Abstract
Macrostructural features in continuously-cast stainless steel slabs such as the distribution of equiaxed and columnar grains, and microporosity, are crucial to the post-processes, and the mechanical properties of the final steel products. Among the methods for controlling grain structure during the continuous casting process, the application of electromagnetic stirring (EMS)..... More

                   Web of Science 2  Crossref 2
Comparative Analysis of Microstructure and Collision Performance of TWB Hot Stamped Parts with Various Strength Combinations
강도조합에 따른 TWB 핫스탬핑 부품의 미세구조 및 충돌성능 비교 분석
Chang Wook Lee, Yeonjung Hwang, Uk Heo, Byung Gil Yoo, Ji Hong Yoo, Taejeong Kim, Kwang Min Yoon
이창욱, 황연정, 허욱, 유병길, 유지홍, 김태정, 윤광민
Korean J. Met. Mater. 2022;60(11):801-810.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.801

Abstract
Hot stamping technology has been steadily developed because it provides both excellent formability and high strength. With the development of TWB hot stamping technology, it is now possible to freely apply the required strength and thickness in the right place. In this study, the microstructure and collision performance of TWB..... More

                   Web of Science 1  Crossref 2
Porous MnO<sub>2</sub>/ carbon Hybrid Material with Improved Electrochemical Performance
Venugopal Nulu
Korean J. Met. Mater. 2021;59(9):670-676.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.670

Abstract
In this work, MnO2 nanoparticles were embedded in a carbon matrix as a porous composite, fabricated using a simple chemical route followed by low-temperature annealing, with activated carbon (AC) as the carbon source in the composite preparation. The porous MnO2/carbon structures contained some selective nanoparticles coated with carbon. The structural..... More

                
Effect of Ni, C and Ti Addition on Shape Recovery Behavior and the Mechanical Properties of Fe-17Mn-5Si-5Cr Shape Memory Alloys
Fe-17Mn-5Si-5Cr 형상기억합금의 형상복원거동 및 기계적 특성에 미치는 Ni, Ti 및 C의 영향
Dohyoung Kim, Yonghwan Kim, Jeong-Jung Oak, Junghoon Lee, Chan Hee Park, Wookjin Lee, Yongho Park
김도형, 김용환, 옥정중, 이정훈, 박찬희, 이욱진, 박용호
Korean J. Met. Mater. 2020;58(10):660-671.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.660

Abstract
Fe-Mn-Si based shape memory alloy is a new functional material that can be used to apply prestress to civil and structural components such as concrete structures. In this study, the effects of alloying elements Ni, C and Ti on the mechanical and shape memory properties of the alloy were investigated..... More

                   Web of Science 7  Crossref 7
Effect of Post Heat-Treatment on the Microstructure, Tensile and Fatigue Properties of Al 3003 Alloy Manufactured by Strip Casting Process
Strip Casting 공정으로 제조된 Al 3003 합금의 미세조직, 인장 및 피로 특성에 미치는 후열처리 영향
Min-Seok Baek, Kwangjun Euh, Chang-Yeol Jeong, Kee-Ahn Lee
백민석, 어광준, 정창열, 이기안
Korean J. Met. Mater. 2020;58(3):151-161.   Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.151

Abstract
Al 3003 alloy was manufactured by strip casting process, and the effect of post heat-treatment on tensile and fatigue properties was investigated. The strip cast Al 300 alloy exhibited a unique globular shaped rapid-cooled solidification structure, and the microstructural characteristic remained after heat-treatment. Asstrip cast (F) and heat-treated (O) alloys..... More

                   Web of Science 4  Crossref 4
Effect of Hot Stamping Heat Treatment Temperature on Resistance Spot Weldability of Al-10% Si Coated 30MnB5 Steel
핫스탬핑 열처리 온도가 Al-10% Si 도금 30MnB5 강의 점용접성에 미치는 영향
Seong Guk Son, Yeonjung Hwang, Chang Wook Lee, Ji Hong Yoo, Minsu Choi
손성국, 황연정, 이창욱, 유지홍, 최민수
Korean J. Met. Mater. 2019;57(12):778-786.   Published online 2019 Oct 8
DOI: https://doi.org/10.3365/KJMM.2019.57.12.778

Abstract
Hot stamping is the most efficient manufacturing process to produce high strength automotive parts with reduced springback. Recently, 30MnB5 steel has been developed for hot stamping steel which can provide above 1700 MPa. However, resistance spot weldability of this steel is insufficient due to the need for a large amount..... More

                   Web of Science 4  Crossref 4
Studies on the Microstructure-Controlled Zn Interlayer for Improving the Adhesion Strength of the Zn/Zn-Mg Double Layer Coating
Zn/Zn-Mg 이중 층 박막의 밀착력 향상을 위한 Zn interlayer 미세구조 제어에 관한 연구
Seung-Hwan Lee, Hoe-Kun Kim, Myeon-Kyu Song, Jung-Wan Kim, Sang-Yul Lee
이승환, 김회근, 송면규, 김정완, 이상율
Korean J. Met. Mater. 2019;57(11):695-700.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.695

Abstract
In this study, the microstructure-controlled Zn interlayers were synthesized to improve the adhesion strength of Zn/Zn-Mg double layer coatings. The coating chamber temperature and working pressure were controlled based on the Structure Zone Model principles, to obtain a dense columnar microstructure in the Zn interlayer. By controlling the coating chamber..... More

                   Web of Science 1  Crossref 1
Effect of Cr and N on Stress Corrosion Cracking Behavior of Fe-18Mn Steel
Fe-18Mn강의 응력부식균열 거동에 미치는 크롬과 질소의 영향
Heesoo Choi, Sumin Kim, Hyokyung Sung, Sung-Joon Kim, Sangshik Kim
최희수, 김수민, 성효경, 김성준, 김상식
Korean J. Met. Mater. 2019;57(10):624-631.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.624

Abstract
High-Mn steels developed for offshore industries require good resistance to stress corrosion cracking (SCC) in seawater. Elements like Cr and N are often added to improve the resistance to SCC. In this study, the SCC behavior of Fe18Mn3Cr0.1N and Fe19Mn19Cr0.6N steels in artificial seawater was examined. Slow strain rate tests..... More

                   Web of Science 7  Crossref 6
Effects of Tempering Condition on the Microstructure and Mechanical Properties of 30MnB5 Hot-Stamping steel
핫스탬핑용 30MnB5강의 템퍼링 조건에 따른 미세조직 및 기계적 물성 연구
Junyeong Jeong, Sang-Cheon Park, Ga-Young Shin, Chang Wook Lee, Tae-Jeong Kim, Min-Su Choi
정준영, 박상천, 신가영, 이창욱, 김태정, 최민수
Korean J. Met. Mater. 2018;56(11):787-795.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.787

Abstract
The effects of tempering condition on the microstructure and mechanical properties of 30MnB5 hot stamping steel were investigated in this study. Before the tempering, hot-stamped 30MnB5 steel was composed of only α′-martensite microstructure without precipitates. After the tempering at 180 ℃ for 120 min, nano-sized ε-carbides were precipitated in the..... More

                   Crossref 9
Effect of Carbon Addition and Recrystallization on the Microstructure and Mechanical Properties of CoCrFeMnNi High Entropy Alloys
CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
Jun Yeong Ko, Jae Sook Song, Sun Ig Hong
고준영, 송재숙, 홍순익
Korean J. Met. Mater. 2018;56(1):26-33.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.26

Abstract
The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at..... More

       Crossref 5
Effects of Homogenization Treatment, Mn/S ratio and -ferrite on the Hot Workability of Free-Machining 303-series Austenitic Stainless Steels
쾌삭 303계 스테인레스강의 열간성형성에 미치는 균질화처리, Mn/S 비 및 델타-페라이트의 영향
Jae-Young Jung
정재영
Korean J. Met. Mater. 2017;55(12):880-887.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.880

Abstract
To improve the hot-workability of free-machining austenitic stainless steel, we studied the effects of homogenization treatment, Mn/S ratio and the retained δ-ferrite on the hot-workability of 303 austenitic stainless steels. The reduction of area was measured as a function of homogenization temperature in the range of 1160-1250 ℃ and 1-50..... More

       Crossref 1
Effect of Cooling Rate on the Microstructure and Mechanical Properties of Fe-Mn-Al-C Light-Weight Steels
Fe-Mn-Al-C계 경량철강의 미세조직 및 기계적 물성 변화에 미치는 냉각속도의 영향
Jun Young Park, Seong-Jun Park, Jae-Hyun Lee, Joonoh Moon, Tae-Ho Lee, Kyeong Jae Jeong, Heung Nam Han, Jong-Ho Shin
박준영, 박성준, 이재현, 문준오, 이태호, 정경재, 한흥남, 신종호
Korean J. Met. Mater. 2017;55(12):825-835.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.825

Abstract
The effects of cooling after solution heat treatment on the microstructure and mechanical properties of light-weight steels were investigated using Fe-30Mn-xAl-0.9C alloys containing 9.0–12.8 wt% Al. Lab-scale specimens (thickness: 10 mm) of the alloys were cooled by different cooling rates from -337 to -0.053 ℃/s using water, air, and furnace..... More

       Crossref 1
Effects of Microstructure Variation on Tensile and Charpy Impact Properties in Heavy-Section SA508 Gr.3 Low Alloy Steels for Commercial Reactor Pressure Vessel
SA508 Gr.3 상용 원자로용기강의 두께방향 미세조직 변화가 인장 및 충격특성에 미치는 영향
Seokmin Hong, Cholong Lee, Min-Chul Kim, Bong-Sang Lee
홍석민, 이초롱, 김민철, 이봉상
Korean J. Met. Mater. 2017;55(11):752-759.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.752

Abstract
In this study, the effects of microstructural variations in heavy-section reactor pressure vessel (RPV) steels on tensile and Charpy impact properties were investigated. Two PRV blocks, OPR1000 and APR1400 (ORV, ARV) were taken from the archive materials used in Korea standard nuclear power plants. Test specimens were sampled from five..... More

       Crossref 5
Effect of Mn, Si, and Sb on High-temperature Oxidation of Fe-Mn-Al-Si-Sb-C Steels
Fe-Mn-Al-Si-Sb-C 강의 고온산화에 미치는 Mn, Si, Sb 첨가효과
Soon Yong Park, Dong Bok Lee
박순용, 이동복
Korean J. Met. Mater. 2017;55(5):308-314.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.308

Abstract
High Mn twinning-induced plasticity (TWIP) steels with compositions of Fe-(18.0-18.17) Mn-1.51Al-(0.48-0.52)Si-(0.61-0.62)C-(0.52-0.54)Cr-(0.22-0.23)Ni-0.03Nb-(0-0.04)Sb (wt%) are oxidized at 650 ℃ and 750 ℃ for < 24 h in air in order to determine the effect of the alloying elements on the oxidation. They are oxidized parabolically to MnO2,Mn2O3,FeO,Fe2O3, and FeMn2O4 oxides with relatively..... More

       Crossref 1
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