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Volume 55(9); Sep 2017
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Research Papers
600 Effect of Oxygen Content on the Phase Transformation of Ti-5Al-2.5Fe Alloy During Continuous Cooling
연속냉각 중 산소함량이 Ti-5Al-2.5Fe 합금의 상변태 거동에 미치는 영향
Do-Heon Kim, Jong Woo Won, Dae-Won Jeong, Hak-Sung Lee, Seog-Young Yoon, Yong-Taek Hyun
김도헌, 원종우, 정대원, 이학성, 윤석영, 현용택
Korean J. Met. Mater. 2017;55(9):600-608.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.600

The effects of oxygen content on the β to α phase transformation of the Ti-5Al-2.5Fe alloy during continuous cooling were investigated by varying the oxygen content between 0.08 – 0.41 wt%. Dilatometer tests were performed at cooling rates of 0.05 – 100 ℃/s combined with microstructure observation to examine phase..... More

609 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

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

615 Hydrogen-Affected Tensile and Fatigue Properties of Ti-6Al-4V Sheets by Superplastic Forming
Jinil Son, Junhyuk Park, Daeho Jeong, Yongnam Kwon, Masahiro Goto, Sangshik Kim
Korean J. Met. Mater. 2017;55(9):615-623.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.615

Mill-annealed Ti-6Al-4V (Ti64) sheets were formed into rectangular shaped pans with two square recesses by the superplastic forming (SPF) technique under high pressure using commercial grade argon gas. The SPF process induced a significant decrease in the tensile ductility and high cycle fatigue (HCF) resistance of the Ti64 alloy. The..... More

624 Wetting Behavior of Liquids on Micro-Patterned Polymer Surfaces Fabricated by Thermal Imprinting
Kwang-Jin Bae, Wenhui Yao, Yiliang He, Young-Rae Cho
Korean J. Met. Mater. 2017;55(9):624-631.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.624

The wetting behavior of liquids on solid surfaces is important in the study of surfaces and interfaces. In this study, the wetting behavior of deionized (DI) water and hexadecane on fluorinated and micro-patterned polymer surfaces was investigated. The sample surfaces were processed by spray coating and thermal imprinting, respectively. The..... More

632 Sintering of a Nanostructured CoZr-ZrO2 Composite from Mechanochemically Synthesized Powders
기계화학적 합성과 나노구조 CoZr-ZrO2 복합재료 소결
In-Jin Shon, Jin-Kook Yoon, Kyung-Tae Hong
손인진, 윤진국, 홍경태
Korean J. Met. Mater. 2017;55(9):632-636.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.632

Since their development in the 1970s ZrO2 ceramics have been shown to be promising alternative materials for total hip arthroplasty (THA) and total knee arthroplasty (TKA). However, ZrO2 is so brittle that in vivo failure can result from fracture of the ceramic femoral head and fracture of the ceramic acetabular..... More

637 Review of Conductive Copper Paste for c-Si Solar Cells
Sang Hee Lee, Doo Won Lee, Soo Hong Lee
Korean J. Met. Mater. 2017;55(9):637-644.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.637

In the photovoltaic industries, the main technique of metallization is screen printing with silver pastes, due to its simple and quick process. However, the high price of silver paste is one of the barriers to the producing of low cost solar cells. Consequently, a primary target in photovoltaic research is..... More

645 A Study on the Soft Magnetic Properties and Compaction Density of Fe-based Nanocrystalline Powder Cores Mixed with Permalloy Powders
퍼멀로이 분말이 혼합된 철계 나노결정립 분말코어의 성형밀도와 연자성 특성에 관한 연구
Jeong Hoon Shin, Young Mok Jeong, Keun Yong Sohn, Won-Wook Park
신정훈, 정영목, 손근용, 박원욱
Korean J. Met. Mater. 2017;55(9):645-650.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.645

In this paper, the soft magnetic properties and compaction density of Fe-Si-B-Nb-Cu nanocrystalline powder cores, mixed with two kinds of permalloy powders (Ni70Fe30 or Ni50Fe50), have been closely studied. Permalloy powders having an average diameter of 4μm were added in the range of 5 to 15 wt%, and the powder..... More

651 Effects of Sb on the Charge Transport and Power Factor of Bi2-xSbxTe3 Thermoelectric Compounds Prepared by Hot Pressing
열간 압축 방법으로 제작된 Bi2-xSbxTe3 열전소재 복합체에서 Sb 함량이 전하수송과 출력인자에 미치는 효과
Young Soo Lim, Soonil Lee
임영수, 이순일
Korean J. Met. Mater. 2017;55(9):651-656.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.651

We report the effects of Sb content on the charge transport and power factor of Bi2-xSbxTe3(1.56 ≤χ≤ 1.74) compounds prepared by hot pressing. From the temperature-dependence of the electrical conductivity, it was found that the charge transport in the compounds was predominantly governed by acoustic phonon scattering, and additionally affected..... More

657 Increase in the Hydrogen-Sorption Rates and the Hydrogen-Storage Capacity of MgH2 by Adding a Small Proportion of Zn(BH4)2
Hye Ryoung Park, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2017;55(9):657-663.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.657

Abstract: In this work, Zn(BH4)2 was added to improve the hydrogen-storage properties of MgH2. A 99 wt% MgH2+1 wt% Zn(BH4)2 sample was prepared by milling in a planetary ball mill in a hydrogen atmosphere. The proportion of the added Zn(BH4)2 was small (1 wt%) in order to increase hydriding and..... More

664 Evaluation of Mechanical Property for Welded Austenitic Stainless Steel 304 by Following Post Weld Heat Treatment
STS304의 후열처리에 따른 용접부 미세조직과 기계적 특성 평가
Daehan Jang, Kwangyoon Kim, Hyoung Chan Kim, Jong Bae Jeon, Dae-Geun Nam, Keun Yong Sohn, Byung Jun Kim
장대한, 김광윤, 김형찬, 전종배, 남대근, 손근용, 김병준
Korean J. Met. Mater. 2017;55(9):664-670.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.664

Austenitic stainless steels have excellent mechanical property and corrosion resistance, and are for these reasons used in demanding applications such as power plant, nuclear reactor and off-shore plant. Especially, austenitic stainless steel 304 (STS304) is mainly used as a pipe material in nuclear power plants. Submerged arc welding (SAW) is..... More

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