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Volume 56(8); Aug 2018
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Research Papers
551 Effects of Initial Microstructures and Annealing Conditions on Mechanical Properties of Cryo-rolled Low Carbon Manganese Steels
극저온압연한 저탄소망간강의 초기 미세조직과 어닐링 조건이 기계적성질에 미치는 영향
Jong Chul Lee, Won Jong Nam
이종철, 남원종
Korean J. Met. Mater. 2018;56(8):551-560.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.551

The effect of annealing on the microstructural evolution of the matrix in low carbon manganese steels with different initial microstructures, including martensite, bainite and a mixture of ferrite and pearlite, was investigated in conjunction with the charge in mechanical properties. During annealing, steels with a deformed ferrite + pearlite microstructure..... More

561 Microstructure Evaluation and Low Cycle Fatigue Damage due to Degradation of Ni-based Superalloy
니켈기 초내열합금의 열화에 따른 미세구조 및 저주기 피로손상도 평가
Inkang Heo, Donghyun Yoon, Sanghyun Hong, Jinyeol Kim, Jaehoon Kim, Sungho Chang, Siyeon Bae
허인강, 윤동현, 홍상현, 김진열, 김재훈, 장성호, 배시연
Korean J. Met. Mater. 2018;56(8):561-569.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.561

Nickel-based superalloys have excellent resistance to extreme environments such as high temperature and high stress and are used as materials for large gas turbines. In this paper, specimens were taken from a blade that had been used for a long time, and their life span was studied by analysis of microstructure...... More

570 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

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

580 Evaluation on Reheat Cracking of Multi-pass Weld Metal of YP 690 QT Steel
해양플랜트용 YP 690 MPa급강 다층 용접부의 재열 균열 특성 평가
Yong Taek Shin, Young Ju Jo
신용택, 조영주
Korean J. Met. Mater. 2018;56(8):580-588.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.580

This study evaluated the relationship between reheat cracking that occurs in the reheated weld zone formed by subsequent multi-pass welding and the preheat/interpass temperature. The multi-pass weldment was YP 690 MPa high-strength steel, which is used in mobile offshore platform units. The welding process was flux-cored arc welding (FCAW), which..... More

589 Formation of Delta Ferrite with Solidification Rates in 10Cr1MoW Steel
10Cr1MoW강에서 응고속도에 따른 δ 페라이트 형성거동
Suncheol Kwon, Yunkon Joo, Changhoon Sung, Myunggyun Son, Jongho Shin, Seongmoon Seo, Jehyun Lee
권순철, 주윤곤, 성창훈, 손명균, 신종호, 서성문, 이재현
Korean J. Met. Mater. 2018;56(8):589-596.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.589

Martensitic 10Cr1MoW steels are widely used for high temperature components in turbine engines because they have good mechanical properties and corrosion resistance. Delta-ferrite can form locally in large ingots and the ferrite phase degrades the metal’s high-temperature properties. To decrease the fraction of delta-ferrite the solidification process should be controlled...... More

597 Comparison of Counter Current Extraction Process of Pr & Nd Separation using Cyanex 572 and PC88A
Cyanex 572와 PC88A를 사용하여 Pr 및 Nd 분리 시 향류추출 공정 비교
Joo-eun Lee, Hong-Il So, Yeon-Chul Cho, Jae-Woo Ahn, Hong-in Kim, Jin-young Lee
이주은, 소홍일, 조연철, 안재우, 김홍인, 이진영
Korean J. Met. Mater. 2018;56(8):597-604.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.597

This study designed a counter current extraction process for comparing the separation efficiencies that are obtained using Cyanex 572 and PC88A for the elements in a Pr and Nd mixed solution. This process involves multiple extraction and scrubbing processes using a mixer settler. The process parameters are calculated using an..... More

605 Potential of Ruthenium and Cobalt as Next-generation Semiconductor Interconnects
Ru와 Co의 차세대 반도체 배선 적용성 연구
Dooho Choi
Korean J. Met. Mater. 2018;56(8):605-610.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.605

Severe resistivity size effect in Cu interconnects is attributed to the relatively long bulk electron mean free path (39 nm at 298 K), which is inherently determined by phonon scattering. In this regard, Ru and Co have been recently considered as attractive alternatives for next-generation interconnect materials because the significantly..... More

611 Hydrogen Uptake and Release Characteristics of Mg-xTaF5-xVCl3 (x=1.25, 2.5, and 5)
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2018;56(8):611-619.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.611

TaF5 and VCl3 were chosen as additives to enhance the hydrogen uptake and release rates of Mg. The total content of the additives was not more than 10 wt% since too high content reduces the fraction of Mg and thus the hydrogen storage capacity of the alloys. Samples with compositions..... More

620 Raising the Dehydrogenation Rate of a Mg-CMC (Carboxymethylcellulose, Sodium Salt) Composite by Alloying Ni via Hydride-Forming Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater. 2018;56(8):620-627.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.620

In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt, [C6H7O2(OH)x(C2H2O3Na)y]n) (named Mg-5 wt%CMC) were prepared through hydride-forming milling. Mg-5 wt%CMC had a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase..... More

628 Analysis on Variations in Underwater Electromagnetic Signals of a Surface Ship as Varying Placement of ICCP Anodes
ICCP 양극 배치 변화에 따른 수중 전자기 신호 변화 분석
Sangkyu Lee, Hyun-Ju Jung, Chang-Seob Yang
이상규, 정현주, 양창섭
Korean J. Met. Mater. 2018;56(8):628-634.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.628

The impressed current cathodic protection (ICCP) is widely used for preventing galvanic corrosion and it strongly influences the underwater electromagnetic signals of a surface ship. For military use, the signals should be reduced to avoid threats such as modern naval weapons triggered by the signals. We analyzed the underwater electric..... More

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