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Table of Contents | August, 2017  Vol. 55   No.8 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
529 Enhanced Mechanical Properties by Directional Solidification and Cold Drawing in Cu Added Zn-Al Alloys
Cu가 첨가된 Zn-Al 합금에서 일방향응고 및 냉간인발에 따른 기계적 특성 향상
Hae Chang Jeong, Min Soo Kim, Jee Hyuk Ahn, Sung Hwan Lim, Seung Zeon Han, Jehyun Lee, Kwang Ho Kim
정해창, 김민수, 안지혁, 임성환, 한승전, 이재현, 김광호
Korean J. Met. Mater. 2017;55(8):529-536.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.529

The lamellar structure of two phases, the Zn-rich and Al-rich phases, is formed in a Zn-5 wt% Al eutectic alloy. In order to study the effect of microstructural changes on the tensile properties of eutectic Zn-Al binary alloy, Zn-Al and Zn-Al-Cu alloys were directionally solidified at a growth rate of..... More

537 Effect of Al and Zr Contents on Mechanical Properties of Ni-Al-Bronze
니알브론즈의 기계적 특성에 미치는 알루미늄 및 지르코늄 함량의 영향
Jee Hyuk Ahn, Dong Wook Kim, Min Soo Kim, Jong-Hyun Hwang, Seung Zeon Han
안지혁, 김동욱, 김민수, 황종현, 한승전
Korean J. Met. Mater. 2017;55(8):537-543.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.537

To study the effect of Al and Zr contents on the microstructural changes and tensile properties of Ni-Al-Bronze alloy, seven specimens were cast with different Al and Zr contents. The microstructure observation revealed that all specimens were composed of β’ and κ phases in a α matrix. With increasing Al..... More

544 Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress
Seok Hwan Jung, Taekyung Lee, Seok Weon Song, Young Jin Kwon, Hyung-Gu Kang, Dongchul Chae, Chong Soo Lee
Korean J. Met. Mater. 2017;55(8):544-549.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.544

The delayed cracking behavior of deep-drawn lean duplex stainless steel (LDSS) was investigated, and compared with that of conventional metastable austenitic stainless steels (MASS). Hydrogen charging was performed by electrochemical method, and the hydrogen-charged specimens were subjected to the slow-strain-rate test. Fractures occurred along the phase boundaries in the LDSS,..... More

550 Direct Laser Deposition of 14Cr Oxide Dispersion Strengthened Steel Powders Using Y2O3 and HfO2 Dispersoids
Barton Mensah Arkhurst, Jin-Ju Park, Chang-Hoon Lee, Jeoung Han Kim
Korean J. Met. Mater. 2017;55(8):550-558.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.550

This study investigated the feasibility of using HfO2 as a dispersoid in the additive manufacturing process, compared to Y2O3. The effect of pre-annealing treatment was investigated too. Scanning electron microscopy (SEM) analyses revealed unusually coarse deposition layers for both the HfO2 and Y2O3 dispersed oxide dispersion strengthed (ODS) steels, in..... More

         Cited By 1
559 Effects of Cooling Rate by Double Austenitizing Tempering Treatment on the Microstructure and Mechanical Properties in Low Alloy Steel
저합금강의 이중 오스테나이징 템퍼링에서 냉각 속도에 따른 미세조직 및 기계적 특성 변화
Gyeong-Hoo Kim, Jae-Ho Jang, Sung-Hwan Kim, Byung-Jun Kim, Keun-Yong Sohn, Dae-Geun Nam
김경후, 장재호, 김성환, 김병준, 손근용, 남대근
Korean J. Met. Mater. 2017;55(8):559-565.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.559

Spent nuclear fuel is stored and transported in cask bodies, but they become embrittled with the passage of time resulting in lattice defects due to neutron irradiation. Cask bodies made by the quenching and tempering (QT) treatment are not safe and are hard to store because of embrittlement caused by..... More

566 Effect of Additive Size on the Softening and Melting Behavior of Slag
슬래그 연화 용융 거동에 미치는 첨가제 입도의 영향
Joon Seok Oh, Jaehong Lee, Joonho Lee
오준석, 이재홍, 이준호
Korean J. Met. Mater. 2017;55(8):566-571.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.566

The Paris climate change agreement made a commitment to keep global warming below 2 ℃. The Korean government confirmed that it would seek a 37% reduction in CO2 emissions by 2030 from the Business As Usual level. CO2 emissions from Korean iron and steel industries account for approximately 15.4% of..... More

576 Electromagnetic Noise Absorption by Conductive Grid Films Prepared by Screen Printing Process
스크린 인쇄공정으로 제조한 그리드 전도막의 전자기 노이즈 흡수특성
Min-Sung Kim, Sung-Soo Kim
김민성, 김성수
Korean J. Met. Mater. 2017;55(8):576-580.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.576

To realize focused design near-field conduction noise absorbers for sub-GHz frequencies, this study proposes screen-printed conductive grid films. The films’ advantages include large-scale production and easy control of electrical properties. A conductive grid film with a resistance value of approximately 70 Ω was screen printed on polyimide film substrate and..... More

581 Near Infrared Reflecting Properties of TiO2/Ag/TiO2 Multilayers Prepared by DC/RF Magnetron Sputtering
Sung Han Kim, Seo Han Kim, Pung Keun Song
Korean J. Met. Mater. 2017;55(8):581-586.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.581

The near-infrared (NIR) reflecting properties of TiO2 /Ag /TiO2 (TAT) multilayers deposited using DC/RF magnetron sputtering were investigated. For high transmittance and reflectance in the visible and NIR ranges, respectively, the thickness of each layer was theoretically optimized by the index matching method. As the Ag layer thickness increased, the..... More

587 A Study on How the Photoreflectance Characteristic in the Al0.21Ga0.79As/GaAs Heterostructure Affects Variable Pumping Intensity
Al0.21Ga0.79As/GaAs의 변조 빔의 세기에 대한 광반사도 특성 연구
Kyeong Su Choi, Soon-Don Choi, Jae-In Yu
최경수, 최순돈, 유재인
Korean J. Met. Mater. 2017;55(8):587-590.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.587

The photoreflectance (PR) method is advantageous in that it is more convenient to use at low temperature and high temperature than electroreflectance (ER) due to the modulation of the electric field. This is caused by the recombination of the surface state charge and the minority carriers generated by the laser..... More

591 Analysis of Underwater Electromagnetic Field Reduction by Mixed-type Cathodic Protection Using the Boundary Element Method
경계요소법을 이용한 혼합형 음극방식 적용에 따른 수중 전자기장 감소 연구
Yong-Sang Kim, Sang Jin Ko, Sangkyu Lee, Jung-Gu Kim
김용상, 고상진, 이상규, 김정구
Korean J. Met. Mater. 2017;55(8):591-599.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.591

In this paper, the influence of mixed-type (impressed-current and sacrificial-anode) cathodic protection on an underwater electromagnetic field was investigated using the boundary element method. The current applied for cathodic protection was reduced by installing sacrificial anodes in the stern region. Also, the potential difference produced by the propeller in the..... More

572 Study of Solution-Processed Indium Zinc Oxide TFTs Made by Simultaneous Spin Coating and Ultraviolet Light Irradiation
스핀코팅과 자외선 조사의 동시 적용을 기반한 용액 공정형 Indium Zinc 산화물 트랜지스터 연구
Fei Shan, Sung-Jin Kim
선비, 김성진
Korean J. Met. Mater. 2017;55(8):572-575.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.572

We investigated solution-processed indium zinc oxide (IZO) thin-film transistors (TFTs) which were fabricated by spin coating with simultaneous irradiation by ultraviolet light. The proposed treatment enhanced the efficient condensation and densification of the oxide semiconducting channel layer by decreasing oxygen-vacancy-related defects and increasing metal-oxide bonds. An IZO TFT irradiated for..... More

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