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A New Fracture Analysis Technique for Charpy Impact Test Using Image Processing
Tae Chang Park, Beom Suk Kim, Ji Hee Son, Yeong Koo Yeo
Korean J. Met. Mater. 2021;59(1):61-66.   Published online 2021 Jan 5
DOI: https://doi.org/10.3365/KJMM.2021.59.1.61

The Charpy impact test is used to identify the transition between ductility and brittleness. The percentages of ductile and brittle fractures in steel can be evaluated based on each fracture area, which is presently determined by an analyzer with the naked eye. This method may lead to subjective judgement, and..... More

Mechanical Properties and Fabrication of 4YSZ-BN Composites by Pulsed Current Activated Sintering
펄스 전류 활성 소결에 의한 4YSZ-BN 복합재료 제조와 기계적 성질
Woo-Jin Cho, Seong-Eun Kim, Se-Hoon Oh, In-Jin Shon
조우진, 김성은, 오세훈, 손인진
Korean J. Met. Mater. 2019;57(12):764-770.   Published online 2019 Nov 22
DOI: https://doi.org/10.3365/KJMM.2019.57.12.764

4YSZ is generally used in fuel cells, oxygen sensors, hip and knee joint replacements and thermal barriers because of it excellent properties, including low density, high biocompatibility, good resistance against corrosion, hard phase and high melting point, and high ionic conductivity. However, 4YSZ with large grain has low resistance to..... More

                           Cited By 1
Cleavage Dicing Mechanics in Silicon Wafers
실리콘 웨이퍼의 그리비지 다이싱 역학
Seong-Min Lee, Yeon-Wook Kim
이성민, 김연욱
Korean J. Met. Mater. 2019;57(11):689-694.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.689

This article details how effectively dicing damage of silicon wafers can be mechanically minimized by appropriate laser-induced groove formation prior to wafer separation. Various laser dicing factors, such as the laser-control power, the scan rate and the scan number of the laser beam, were estimated to determine the optimum groove..... More

                           Cited By 1
Property Evaluation of Binderless-WC Hard Materials as a Function of Sintering Temperature
소결온도 변화에 따른 Binderless-WC 소결체 특성평가
Hyun-Kuk Park, Jeong-Han Lee, Jun-Ho Jang, Ik-Hyun Oh
박현국, 이정한, 장준호, 오익현
Korean J. Met. Mater. 2019;57(5):304-309.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.304

In this study, Binderless-WC hard materials were fabricated using the pulsed current activated sintering (PCAS) process for a Friction Stir Welding tool and difficult-to-cut tool application. Tungsten carbide (WC) hard materials are used in various industries and possess a superior hardness compared to other hard materials. They have particularly high..... More

                           Cited By 4
Effects of Exposure Temperature on Tensile and Charpy Impact Properties of the 7xxx Aluminum Alloy for Aerospace Applications
항공용 7xxx계 알루미늄 합금의 고온 노출 온도가 인장 및 샤르피 충격 특성에 미치는 영향
Woojin An, Dohee Kim, Bong-Hwan Kim, Shae Kwang Kim, Sangshik Kim, Hyokyung Sung
안우진, 김도희, 김봉환, 김세광, 김상식, 성효경
Korean J. Met. Mater. 2019;57(4):214-226.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.214

Aluminum alloys have been widely used for aerospace applications due to their high strength and lightweight. New demand is growing for aluminum alloys with high temperature mechanical properties that can sustain plastic deformation at high temperature. In this study, correlations among microstructure, tensile properties and Charpy impact properties were analyzed..... More

                           Cited By 3
Effect of BN Addition on the Mechanical Properties of TiN-BN Composites
Woo-Jin Cho, In-Jin Shon
Korean J. Met. Mater. 2018;56(9):658-663.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.658

Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its..... More

                           Cited By 14
Effect of Hot Forging and Heat Treatment on the Microstructure and Mechanical Properties of Cr Steel
Cr강의 미세조직과 파괴인성에 미치는 열간단조 및 열처리 공정의 영향
Dong Jun Lee, Yong-Nam kwon, Min Suk Kim, Ga Eun Ku, Sang Hyun Heo, Nam Yong Kim, Jin-Mo Lee
이동준, 권용남, 김민석, 구가은, 허상현, 김남용, 이진모
Korean J. Met. Mater. 2018;56(3):221-226.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.221

In this study, the effects of hot forging and heat treatment (quenching and tempering) of cast Cr alloy steel on the microstructures and mechanical properties were investigated. The hot forging was performed at a compressive ratio 0.5 at 1,250 oC. The heat treatment process was quenching (860 oC for 2..... More

Effects of Manufacturing Conditions on Tensile Fracture Behaviors in Hyper-Eutectoid Steel Wires
과공석 강선에서 공정조건이 인장파단 거동에 미치는 영향
Kang Suk An, Jung Hoon Park, Won Jong Nam
안강석, 박정훈, 남원종
Korean J. Met. Mater. 2018;56(3):187-196.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.187

This study investigated the effects of manufacturing conditions, such as patenting temperature and drawing strains, on the tensile fracture behaviors, especially on reduction of area (RA), of hyper-eutectoid steel wire. Steel wires with the chemical compositions of Fe-0.92C-1.3Si-0.6Mn-0.3Cr (wt%), were austenitized at 900 °C for 3 min and isothermally transformed..... More

Analysis of Deformation and Failure Behaviors of TIG Welded Dissimilar Metal Joints Using Miniature Tensile Specimens
소형 인장시편을 이용한 TIG 용접된 이종금속 접합부의 변형 및 파괴거동 분석
Ji-Hwan Shin, Nabeel Jahanzeb, Min-Seong Kim, Ji-Hyun Hwang, Shi-Hoon Choi
신지환, Nabeel Jahanzeb, 김민성, 황지현, 최시훈
Korean J. Met. Mater. 2017;55(2):125-131.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.125

The deformation and failure behaviors of dissimilar metal joints between SS400 steel and STS316L steel were investigated. The dissimilar metal joints were fabricated using the tungsten inert gas (TIG) welding process with STS309 steel as a filler metal. The microstructures of the dissimilar metal joints were investigated using an optical..... More

         Cited By 3
Effect of Incremental Displacement on the Fracture Resistance Curve of Nuclear Piping Materials under Reverse Cyclic Loading
역사이클 하중의 증분변위가 원전배관 재질의 파괴저항곡선에 미치는 영향
Sang-Young Kim
Korean J. Met. Mater. 2017;55(2):85-90.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.85

Reverse cyclic loading introduces alternatinf tensile and compressive loads to a structure. Several researchers have reported that a reverse cyclic load decreases the fracture resistance curve of carbon steel. In this paper, the fracture toughness of SA312 TP304 stainless steel, which is a nuclear piping material, was investigated under a..... More

Effect of Strength Coefficient of Bainite on Micromechanical Deformation and Failure Behaviors of Hot-Rolled 590FB Steel during Uniaxial Tension
열연 590FB강의 일축인장 시 미소역학적 변형거동 및 파괴거동에 미치는 베이나이트의 강도계수의 영향
Eun-Young Kim, Sung Il Kim, Shi-Hoon Choi
김은영, 김성일, 최시훈
Korean J. Met. Mater. 2016;54(11):808-816.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.808

The effect of the strength coefficient (KB) of bainite on micromechanical deformation and failure behaviors of a hot-rolled 590MPa steel (590FB) during uniaxial tension was simulated using the elasto-plastic finite element method (FEM). The spatial distribution of the constituent phases was obtained using a phase identification technique based on optical..... More

         Cited By 6
Electronic Materials
Effect of Sawing Velocity Variation on Chipping Damage of Semiconductor Wafers with Different Thicknesses
다이싱 속도 변화가 두께가 차별화된 반도체 웨이퍼의 칩핑 손상에 미치는 영향
Seong-Min Lee
Korean J. Met. Mater. 2016;54(8):598-604.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.598

This work details how the sawing velocity influences the chipping damage of semiconductor wafers with different thicknesses during wafer separation. The experimental result shows that at a sawing velocity higher than 60000 rpm, in thinner wafers the magnitude of chipping damage more strongly depends on the revolving velocity of the..... More

         Cited By 3
Powder Metallurgy
Fabrication and Mechanical Properties of Nanostructured TiC-TiAl by the Pulsed Current Activated Sintering
펄스전류 활성 소결에 의한 나노구조 TiC-TiAl 제조 및 기계적 성질
Bong-Won Kwak, Byung-Su Kim, Jin-Kook Yoon, Kyung-Tae Hong, In-Jin Shon
곽봉원, 김병수, 윤진국, 홍경태, 손인진
Korean J. Met. Mater. 2016;54(8):566-572.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.566

TiC-Co or TiC-Ni hard materials have been used for cutting tools. However, the high cost and the low hardness of Ni or Co, and the low corrosion resistance of the TiC-Ni and TiC-Co cermets have generated interest in recent years in using them as alternative binder phases. In this study,..... More

         Cited By 4
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