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Table of Contents | November, 2020  Vol. 58   No.11 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
741 Development of a Novel Plastic Hardening Model Based on Random Tree Growth Method
랜덤 트리 성장을 이용한 소성 경화 모델 개발방법 및 새로운 모델 제안
Hyoung-Seo Son, Young-Gon Kim, Jin-Jae Kim, Young-Suk Kim
손형서, 김영곤, 김진재, 김영석
Korean J. Met. Mater. 2020;58(11):741-751.   Published online 2020 Oct 21
DOI: https://doi.org/10.3365/KJMM.2020.58.11.741

The flow functions for plastic deformation have been developed to describe the plastic behavior of sheet metals. In order to explain the plastic behavior of material in metal forming processes via finite element analyses, two basic input functions should be applied. One is the yield function that determines the yielding..... More

752 Effect of Nb addition and Pre-strain on Hydrogen Embrittlement of Low-carbon Steels with Ferrite-pearlite Structure
페라이트-펄라이트 조직 저탄소강의 수소 취성에 미치는 Nb 첨가와 예비 변형의 영향
Seok-Woo Ko, Ji-Min Lee, Byoungchul Hwang
고석우, 이지민, 황병철
Korean J. Met. Mater. 2020;58(11):752-758.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.752

The effect of pre-strain on the hydrogen embrittlement of Nb-free and Nb-added low-carbon steels with ferrite-pearlite structure was investigated in this study. After the steels were electrochemically charged with hydrogen, slow-strain rate tensile (SSRT) tests were conducted on them to examine hydrogen embrittlement behavior. The SSRT test results revealed that..... More

759 Tensile and Compressive Deformation Behaviors of High-Strength Cu Bulk Material Manufactured by Cold Spray
저온 분사 공정으로 제조된 초고강도 Cu 벌크 소재의 인장 및 압축 변형 거동
Young-Kyun Kim, Kee-Ahn Lee
김영균, 이기안
Korean J. Met. Mater. 2020;58(11):759-767.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.759

In this study, high-strength pure Cu bulk material was manufactured using a cold spray additive manufacturing process, and its microstructure, tensile and compressive deformation behaviors were investigated and compared. The cold spray additive manufactured Cu bulk material showed a heterogeneous grain structure consisting of fine-grains and coarse-grains, and only α..... More

768 Effect of Inorganic Filler Addition on Non-Combustible and Mechanical Properties of Color Coated Steel Sheets
컬러강판 불연성 및 가공성에 미치는 무기충진제 첨가량의 영향
Moon-Hi Hong, In-kyu Kim, Hye-Jeong Yun
홍문희, 김인규, 윤혜정
Korean J. Met. Mater. 2020;58(11):768-775.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.768

Recent large-scale fires in buildings and logistic warehouses have become a major social issue, involving both property loss and multiple casualties. To make color coated steel sheets non-combustible and/or have anti-fire properties, various ways of optimizing manufacturing parameters have been investigated for outer, inner, roof and ceiling panels. In the..... More

776 Rapid Sintering and Synthesis of Nanocrystalline Ta-ZrO2 Composite
나노구조 Ta-ZrO2 복합재료 합성과 급속소결
Seong-Eun Kim, In-Jin Shon
김성은, 손인진
Korean J. Met. Mater. 2020;58(11):776-781.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.776

ZrO2 is a promising candidate for knee and hip joint replacements due to its excellent combination of low density, corrosion resistance and biocompatibility. Nevertheless, a low fracture toughness of pure ZrO2 at room temperature limits its wider application in the industry. One of the most obvious ways to solve the..... More

782 A Study on the Influence of Laser Power on the Microstructure and Mechanical Properties of Functionally Graded Materials Produced by Direct Energy Deposition
고에너지 직접 적층법으로 제조된 경사조성재료의 미세조직 및 기계적 특성에 미치는 레이저 출력의 영향 연구
Giseung Shin, Ji hyun Yoon, Dae Whan Kim, Yongho Park, Jeoung Han Kim
신기승, 윤지현, 김대환, 박용호, 김정한
Korean J. Met. Mater. 2020;58(11):782-792.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.782

This study investigated the effects of laser power on the microstructure and mechanical properties of functionally gradient materials (FGM) produced by direct energy deposition. The FGM consisted of five different layers, which were a mixture of austenitic stainless steel (Type 316L) and ferritic steel (HSLA). During the direct energy deposition,..... More

793 Enhanced Optical and Electrical Properties of Ti Doped In2O3 thin Films Treated by Post-deposition Electron Beam Irradiation
Su-Hyeon Choe, Yun-Je Park, Yu-Sung Kim, Byung-Chul Cha, Sung-Bo Heo, Sungook Yoon, Young-Min Kong, Daeil Kim
Korean J. Met. Mater. 2020;58(11):793-797.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.793

Transparent and conductive Ti doped In2O3 (TIO) films were prepared on slide glass substrate using a radio frequency (RF) magnetron sputter and then subjected to Transparent and conductive Ti doped In2O3 (TIO) films were prepared on a glass slide substrate using radio frequency (RF) magnetron sputter. The film surface was..... More

798 Facile Synthesis of Single-Phase Alpha-Tungsten Nanopowders from Ammonium Paratungstate by RF Induction Thermal Plasma and Thermochemical Reduction
Dongyoon Shin, Hyun-Woo Shim, Basudev Swain, Kyung-Soo Park, Chan-Gi Lee
Korean J. Met. Mater. 2020;58(11):798-807.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.798

Facile, economic methods of preparing tungsten (W) nanopowder are critically needed to meet industrial demand. Herein, we report a method of preparing single-phase alpha-W (α-W) nanopowders using ammonium paratungstate (APT) as a starting material and the optimum synthesis conditions. The process involves two stages: i) the radio-frequency (RF) induction thermal..... More

808 Transforming Carbon Black into Graphene Oxide Quantum Dots by Pulsed Laser Ablation in Ethanol
Jung-Il Lee, Jeong Ho Ryu
Korean J. Met. Mater. 2020;58(11):808-814.   Published online 2020 Oct 21
DOI: https://doi.org/10.3365/KJMM.2020.58.11.808

Graphene oxide quantum dots (GOQDs) are nanometer-sized graphene oxide fragments that exhibit unique properties, making them interesting candidates for a range of new applications. Carbon black, one of the commercially available carbon precursors, is produced by the thermal decomposition or incomplete combustion of organic compounds. It is commonly used as..... More

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