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Volume 58(5); May 2020
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Research Papers
293 Effect of Bainitic Microstructure on Low-Temperature Toughness of High-Strength API Pipeline Steels
고강도 API 라인파이프강의 저온 인성에 미치는 베이나이트계 미세조직의 영향
Seung-Wan Lee, Sang-In Lee, Byoungchul Hwang
이승완, 이상인, 황병철
Korean J. Met. Mater. 2020;58(5):293-303.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.293

In this study the correlation between bainitic microstructure and the low-temperature toughness of high-strength API pipeline steels was discussed in terms of crack initiation and propagation in the microstructure. Three types of API pipeline steels with different bainitic microstructures were fabricated using varying alloying elements and thermo-mechanical processing conditions, and..... More

304 Synthesis of Porous Silica Particles for the Adsorption of Organic Dye in Aqueous Medium
Young-Sang Cho, Sol Jeong, Soyoung Nam
Korean J. Met. Mater. 2020;58(5):304-318.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.304

This study investigated the removal of the organic dye like methylene blue using porous particles in a batch adsorption process. Porous silica microparticles were synthesized with macropores or meso-macropores and used as adsorbent particles. The hierarchically porous structures with additional mesopores were found to be more effective adsorbent than simple..... More

319 The Effect of the Surface Energy of Water Glass on the Fluidity of Sand
Min A Bae, Man Sig Lee, Jae Ho Baek
Korean J. Met. Mater. 2020;58(5):319-325.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.319

In recent years, the metal casting industry has sought to meet ever more stringent environmental standards. Inorganic binders based on silicate chemistry have many advantages with respect to environmental issues, but often suffer from reduced strength, burn-on and poor water-resistance. In particular, when sand is mixed with a water glass..... More

326 Design of Ultrawide Bandwidth Electromagnetic Wave Absorbers with Square Patch Frequency Selective Surfaces with Different Geometries
Tian Liu, Sung-Soo Kim
Korean J. Met. Mater. 2020;58(5):326-333.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.326

A reliable and efficient numerical method is presented for the design of broadband absorbers, fabricated by layering two square patch-frequency selective surfaces (SP-FSS) with different geometries on a grounded dielectric substrate. The circuit parameters of the inductance and capacitance of the SP-FSS were retrieved using the strip wire conductor model...... More

334 Thermoelectric Transport Properties of N-type Bi2Te2.7Se0.3 Compound Prepared by Oxide-Reduction Process
산화물 환원공정에 의해 제작된 n-형 Bi2Te2.7Se0.3 화합물의 열전특성연구
Young Soo Lim, Bae Gun Park, Gil-Geun Lee
임영수, 박배건, 이길근
Korean J. Met. Mater. 2020;58(5):334-339.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.334

We report the thermoelectric transport properties of n-type Bi2Te2.7Se0.3 compounds prepared by oxide-reduction process. The oxide-reduction process is a recently developed method that can synthesize Bi2Te3-based compounds using only oxide starting materials, which is advantageous in terms of the diversity of the starting materials and cost efficiency. In this study,..... More

340 Synthesis of Fe-Doped Tetrahedrites Cu12-xFexSb4S13 and Characterization of Their Thermoelectric Properties
Sung-Yoon Kim, Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2020;58(5):340-347.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.340

Tetrahedrite (C12Sb4S13) has attracted attention as a p-type thermoeletric material with very low thermal conductivity induced by the anharmonic oscillation of Cu due to the lone-pair electrons of Sb. Many studies have been conducted to improve its thermoelectric performance by partially substituting the transition elements for the Cu sites. In..... More

348 Enhanced Thermoelectric Transport Properties of n-type InSe by Sn doping
Sung-sil Choo, Seok-won Hong, Hyun-Sik Kim, Sang-il Kim
Korean J. Met. Mater. 2020;58(5):348-352.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.348

Layered post transition metal chalcogenides such as SnSe, SnSe2, In2Se3, and In4Se3 have attracted attention as promising thermoelectric materials due to their intrinsically low lattice thermal conductivities. Recently, n-type indium selenide (InSe) based materials have also been suggested as good candidates for thermoelectric materials by optimizing their electrical properties, i.e.,..... More

353 Catalyst-Free Thermal Evaporation Synthesis of TiO2 Nanostructures in Atmospheric Air
대기압의 공기 분위기에서 촉매를 사용하지 않는 열증발법을 이용하여 생성된 TiO2 나노구조
Geun-Hyoung Lee
Korean J. Met. Mater. 2020;58(5):353-356.   Published online 2020 Apr 14
DOI: https://doi.org/10.3365/KJMM.2020.58.5.353

TiO2 nanostructures were synthesized using a thermal evaporation method without a catalyst. TiO powders mixed with graphite powders were used as the source materials. The synthesis process was performed in air atmosphere at 1000 °C. When the mass ratio of TiO/graphite in the source material was 2:1, TiO2 nanowires and..... More

357 Investigation of Density- and Strain Rate-dependent Strain Hardening-softening-coupled material Behavior of Polyurethane Foams using Elasto-viscoplastic Constitutive Model
탄점소성 구성모델을 활용한 폴리우레탄 폼의 밀도 및 변형률 속도 의존 변형률 경화-연화 연성 재료 거동 규명
Tae-Rim Kim, Chi-Seung Lee
김태림, 이치승
Korean J. Met. Mater. 2020;58(5):357-367.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.357

Polyurethane foam (PUF) is one of the most well-known cellular materials and is widely employed in various industrial and biomedical fields thanks to its many advantages. These include mechanical and material characteristics such as low density and thermal conductivity, and high specific elastic modulus and strength. Despite of these advantages,..... More

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