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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

                        
Effect of Carbon Contents on Corrosion and Hydrogen Diffusion Behaviors of Ultra-Strong Steels for Automotive Applications
탄소함량이 자동차용 초고강도 철강소재의 부식 및 수소 확산 거동에 미치는 영향
Eun Hye Hwang, Hwan Goo Seong, Sung Jin Kim
황은혜, 성환구, 김성진
Korean J. Met. Mater. 2018;56(8):570-579.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.570

Abstract
Recently developed ultra-strong GIGA STEEL exhibites superior mechanical properties, with a high tensile strength of more than 1.5 GPa and good impact toughness. Nevertheless, its application to auto parts has been severely restricted, mainly due to a substantial reduction in the resistance to hydrogen embrittlement (HE) induced by aqueous corrosion...... More

                        
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

         Cited By 2
Hydrogen Induced Crack Propagation in Bainitic X70 Steel in Hydrogen Pressured Tensile Test
베이나이트계 X70강 수소가압분위기 인장시험의 수소취성균열 전파
Byung Hak Choe, Hyeon Su Jang, Bum Gyu Lee, Eui Soo Kim, Woo Sik Kim, Un Bong Baek, Sung Hoon Nam
최병학, 장현수, 이범규, 김의수, 김우식, 백운봉, 남승훈
Korean J. Met. Mater. 2018;56(1):1-7.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.1

Abstract
This study investigated hydrogen induced cracking (HIC) of X70 steel, used for gas pipeline material, with a bainitic microstructure. The effect of hydrogen on the steel was investigated by tensiletesting in a high pressure hydrogen atmosphere, using OM, SEM and TEM analyses. The mechanisms of hydrogen-related cracking were represented as..... More

         Cited By 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

      
Age Hardening and Re-crystallization Softening of a CoCrFeMnNi High Entropy Alloy
고엔트로피 합금강의 시효경화 및 재결정 연화현상
Byung Hak Choe, Hyeon Su Jang, Hyoung Seop Kim, Jong Un Moon
최병학, 장현수, 김형섭, 문종언
Korean J. Met. Mater. 2017;55(10):684-688.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.684

Abstract
Age hardening and re-crystallization softening of a type of high entropy alloy, CoCrFeMnNi, was performed to investigate the relationship between microstructure and the property of mechanical hardness. Equiatomic CoCrFeMnNi was produced by casting followed by homogenizing, cold rolling and post heat treatments. TEM analysis revealed that the microstructure of the..... More

      
Microstructural Evolutions of 22Cr-9Mo-3Fe-4Nb Nickel-Base Superalloy During Low Cycle Fatigue
22Cr-9Mo-3Fe-4Nb 니켈기 초내열합금의 저주기 피로에 따른 미세조직변화
Youngseok Song, Jinik Suk, Chung Yun Kang
송영석, 석진익, 강정윤
Korean J. Met. Mater. 2017;55(9):609-614.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.609

Abstract
A new Ni based superalloy with high fatigue resistance and fine grain was considered as a material for high-pressure buckets in fossil fuel power plants. Since such buckets are usually exposed to extreme operating conditions, low cycle fatigue tests were conducted to understand the microstructure evolution of the material during..... More

      
Carbothermal Reduction of Oxide of WC/Co Hardmetal Scrap
WC/Co 초경 스크랩 산화물의 환원/침탄 반응
CheolMin Kwon, Gil-Geun Lee, Gook-Hyun Ha
권철민, 이길근, 하국현
Korean J. Met. Mater. 2016;54(10):743-751.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.743

Abstract
This study conducted an analysis of the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon under an argon and hydrogen gas atmosphere. The WC/Co hardmetal scrap oxide consisted of WO3 and CoWO4. WO3 was reduced before CoWO4 by the solid carbon regardless of gas atmosphere. The simple oxide..... More

      

이준엽· 이상필 · 이진경 · 이문희 · 황승국

Received 2018 Oct 10     Accepted 2018 Nov 12     Published online 2018 Dec 14
Abstract
Both the mechanical properties and probability distribution of liquid phase sintered SiC (LPS-SiC) materials were investigated, based on a detailed analysis of their microstructures. In particular, the effect of the starting sizes of SiC particles on the characterization of LPS-SiC materials was evaluated. LPS-SiC materials were fabricated with a constant... More
      
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