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Characterization of the Strength of a Natural Sand and Artificial Sand Core Manufactured with Inorganic Binder
물유리계 바인더로 제조한 천연주물사와 인공주물사 중자의 강도 특성
Min A Bae, Pan Seong Kim, Kyeong Ho Kim, Man Sig Lee, Jae Ho Baek
배민아, 김판성, 김경호, 이만식, 백재호
Korean J. Met. Mater. 2021;59(4):273-280.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.273

Natural sand and organic binders are commonly used in casting processes, but these ingredients produce environmental problems with dust and harmful TVOC(Total Volatile Organic Carbon) gases. Research on the introduction of artificial sand and inorganic binders to solve these environmental problems is being actively conducted mainly in the casting industry...... More

Effect of Microstructural Parameters on the Tensile Property of WC-12~22wt%Co Cemented Carbide
WC-12~22wt%Co 초경합금에서 미세조직 인자가 인장 성질에 미치는 영향
Seong Hyeon Ryu, Kyung Il Kim, Wooram Noh, Sang Sub Kim, Gue Serb Cho
류성현, 김경일, 노우람, 김상섭, 조규섭
Korean J. Met. Mater. 2021;59(3):201-208.   Published online 2021 Feb 19
DOI: https://doi.org/10.3365/KJMM.2021.59.3.201

Cemented carbide is a kind of composite material in which fine particles of carbide are embedded into the matrix of a binder metal. It has a long service life because of its superior mechanical properties. In this study, the overall tensile behavior of a cemented carbide, WC-Co, was investigated by..... More

Behavior of Dynamic Strain Aging in Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr Alloy Strip
Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr 지르코늄 합금 압연 판재의 동적 변형시효 거동
Il-Hyun Kim, Myung-Ho Lee, Yang-Il Jung, Hyun-Gil Kim, Jae-Il Jang
김일현, 이명호, 정양일, 김현길, 장재일
Korean J. Met. Mater. 2021;59(1):8-13.   Published online 2021 Jan 5
DOI: https://doi.org/10.3365/KJMM.2021.59.1.8

The behavior of dynamic strain aging (DSA) in a Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr alloy strip was investigated at temperature ranges of 25–600 °C via a tensile test. The tensile test was performed at two different strain rates 8.33 × 10-5 and 1.67 × 10-2 s-1. The shear stress of the alloy strip revealed..... More

Microstructure and Mechanical Properties of NiCrY<sub>2</sub>O<sub>3</sub> Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles
Changjae Kim, Jungho Gwak, Jaewon Lim, Minsuk Oh, Jeshin Park
Korean J. Met. Mater. 2020;58(12):843-851.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.843

In this study, oxide (Y2O3)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH2 and the selective oxidation of Ni–YH2 to Ni–Y2O3. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was..... More

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

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

Effects of Al-Si Coating Thickness on 22MnB5 in Hot Stamping Wear
Al-Si 도금층 두께가 22MnB5강의 핫스탬핑 공정 마모에 미치는 영향
Min Ki Ji, Hyunsung Son, Jinkeun Oh, Seongwoo Kim, Kyungmok Kim, Tea-Sung Jun
지민기, 손현성, 오진근, 김성우, 김경목, 전태성
Korean J. Met. Mater. 2020;58(8):573-582.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.573

Al-Si coated ultra-high strength steels (UHSS) are widely used in automotive applications because of their high strength-to-weight ratio, corrosion protection and good weldability. The hot stamping (also called hot press forming) process is an effective and suitable technique for producing automotive parts from Al-Si coated UHSS. However, critical issues, such..... More

Effect of P/Al Molar Ratio and Curing Conditions of CBAPC Binder on Flexural Strength and Moisture Resistance of Artificial Sand Core
CBAPC 바인더로 제조한 인공사 중자의 강도 및 내습성에 미치는 P/Al 몰 비와 경화 조건의 영향
Hyeon Gon Oh, DongKook Park, Yangdo Kim, Man Sig Lee
오현곤, 박동국, 김양도, 이만식
Korean J. Met. Mater. 2019;57(12):808-816.   Published online 2019 Nov 22
DOI: https://doi.org/10.3365/KJMM.2019.57.12.808

CBAPC (chemically bonded aluminum phosphate ceramic) binders have various advantages, including superior corrosion resistance and strength at high temperature. They are also a non-toxic and eco-friendly material. We investigated an inorganic binder based on CBAPC using artificial sand for casting. The CBAPC binders were synthesized with various P/Al molar ratios..... More

                           Cited By 1
Study on the Effect of the Localized Electrode Degradation on Weldability During an Electrode Life Test in Resistance Spot Welding of Ultra-High Strength Steel
초고강도강 저항 점용접 연속타점시 전극의 국부적 합금화 현상이 용접품질 저하에 미치는 영향 연구
Jae-Won Kim, Siva Prasad Murugan, Nam Hyun Kang, Yeong-Do Park
김재원, Siva Prasad Murugan, 강남현, 박영도
Korean J. Met. Mater. 2019;57(11):715-725.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.715

Evaluation of electrode degradation in resistance spot welding of 1180TRIP steel was carried out through an electrode life test, and weldability testing was performed by the measurement of the nugget size, the peak load analysis and the measurement of the electrode tip size at 30 intervals. Analysis of the change..... More

                           Cited By 1
Influence of Carbon Content and Isothermal Heat Treatment Temperature on the Microstructure and Mechanical Properties of Ultra-High Strength Bainitic Steels
초고강도 베이나이트강의 미세조직과 기계적 성질에 미치는 탄소함량과 항온열처리 온도의 영향
Seung Hwangbo, Hong-Bum Lee, Young-Beum Song, Jinhee Ham, Hong-Kyu Kim, Dong-Woo Suh
황보승, 이홍범, 송영범, 함진희, 김홍규, 서동우
Korean J. Met. Mater. 2019;57(6):335-342.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.335

The effect of carbon content and isothermal heat treatment conditions on the microstructure evolution and mechanical properties of ultra-high strength bainitic steels was investigated. A reduction in carbon content from 0.8 wt% to 0.6 wt% in super-bainite steel with typical chemistry effectively improved not only the Charpy impact toughness but..... More

Anisotropy in Green Body Bending Strength due to Additive Direction in the Binder-Jetting Additive Manufacturing Process
Ji-Won Oh, Sahn Nahm, Byoungmoon Kim, Hanshin Choi
Korean J. Met. Mater. 2019;57(4):227-235.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.227

The additive manufacturing (AM) process is a production technology process that has recently attracted attention. Among AM processes, the binder jetting (BJ) method is advantageous because it allows both wide material selection and design freedom. However, the output arrangement, which determines the direction in which the binder is injected during..... More

                           Cited By 5
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 1
Influence of Nanosized AlN Powders on the Microstructure, Brazeability, and Tensile Properties of Al-based Filler for Low Temperature Al/Cu Dissimilar Brazing
Do Hyun Jung, Jae Pil Jung
Korean J. Met. Mater. 2018;56(9):664-673.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.664

This study examined the influence of nanosized aluminum nitride (AlN) powders (0, 0.01, 0.05, 0.10, 0.30, and 0.50 wt%), on an Al4047-based filler metal. Nanosized AlN powders were dispersed uniformly into the filler metal by a mechanical mixing and melting route using a stainless steel propeller. The influences of nanosized..... More

Effects of Si on the Characteristics of FCA Multi-Layer Weld Metal with 460 MPa Yield Strength Grade Steels for Ships and Marine Structures
선박 및 해양구조물용 항복강도 460 MPa급 강재의 FCA 다층 용접금속부 특성에 미치는 규소의 영향
Jong-Sig Kim, Myeong-Soo Lee, Jong-Min Jung, Han-Geul Choi, Sang-Hoon Jeong, Chang-Yong Kang
김종식, 이명수, 정종민, 최한글, 정상훈, 강창룡
Korean J. Met. Mater. 2018;56(7):499-504.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.499

This study investigated the effect of Si on the characteristics of FCA multi-layer weld metal with 460 MPa yield strength grade steels for ships and marine structures. The effect on microstructure was evaluated by tensile, charpy impact and CTOD testing of 4 FCAW welds containing various C and Si contents...... More

                           Cited By 1
Effect of Carrier Gas on Microstructure and Macroscopic Properties of Tantalum Coating Layer Manufactured by Kinetic Spray Process
Kinetic spray 공정으로 제조된 탄탈럼 코팅층의 미세조직 및 물성에 미치는 송급 가스의 영향
Ga-Ryung Kim, Young-Kyun Kim, Hyung-Jun Kim, Kee-Ahn Lee
김가령, 김영균, 김형준, 이기안
Korean J. Met. Mater. 2018;56(5):360-365.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.360

This study attempted to utilizing the kinetic spray process to manufacture tantalum coating layer and investigated the effect of carrier gas on the microstructure and macroscopic properties of the coating layer. The initial powder feed stock was a massive powder with an average particle size of 24.35 μm and 99.99%..... More

         Cited By 1
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

Effect of Pre-Straining on the High-Cycle Fatigue Properties of Hot-Rolled Steel Sheets for Automotive Structural Uses
자동차 구조용 열연강판의 고주기 피로 특성에 미치는 전변형 효과
Dong-Woog Ha, Chang-Yeol Jeong
하동욱, 정창열
Korean J. Met. Mater. 2018;56(3):177-186.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.177

The drive towards weight reduction in the automotive industry has led to the use of high strength steel sheets for structural applications. Pressing and stamping are important processes in automotive production and result in additional straining on the vehicle body and chassis sheet material. It is therefore important to have..... More

Effect of Heat-Treatment on the Elevated Temperature Compression and Compressive Creep Properties of Fe-14Cr Ferritic Oxide Dispersion Strengthened (ODS) Steel
Fe-14Cr계 페라이틱 산화물 분산 강화강의 고온 압축 및 크리프 특성에 미치는 열처리의 영향
Young-Kyun Kim, Yeun-Ah Joo, Jong-Kwan Park, Hwi-Jun Kim, Man-Sik Kong, Kee-Ahn Lee
김영균, 주연아, 박종관, 김휘준, 공만식, 이기안
Korean J. Met. Mater. 2017;55(12):862-869.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.862

This study investigated the microstructure and the ambient-elevated temperature compression and elevated temperature creep properties of Fe-14Cr ferritic ODS steel manufactured by mechanical alloying (high energy ball milling) and hot extrusion processes. Initial microstructural observation of the as-extruded material identified elongated grains in the direction of extrusion; however, some recrystallization..... More

Bake-hardening Properties of Al-0.6Mg-1.2Si Alloy Sheets Fabricated by Twin Roll Casting
박판주조법으로 제조한 Al-0.6Mg-1.2Si 합금판재의 소부경화특성
Gi-Cheol Ju, Yun-Soo Lee, Min-Seok Kim, Hyoung-Wook Kim, Yang-Do Kim
주기철, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater. 2017;55(12):853-861.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.853

The effect of pre-aging treatment on the microstructure and mechanical properties of Al-0.6Mg-1.2Si aluminum alloy sheets fabricated by twin roll casting (TRC) was investigated. It was observed that two kinds of nanoclusters, cluster(1) and cluster(2), play an important role in the bake-hardening properties of Al-Mg-Si aluminum alloy. The hardness of..... More

Effect of Aluminum Welding Wire Mg Content on the Mechanical Properties of Al 5083 Alloy Weld Metal
Al 5083 합금 용접부의 기계적 물성에 미치는 Mg의 영향
Dongyoon Kim, Dongcheol Kim, Munjin Kang, Young-Min Kim
김동윤, 김동철, 강문진, 김영민
Korean J. Met. Mater. 2017;55(10):716-723.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.716

A new aluminum welding wire with 0.8 wt% higher in Mg content was developed and compared with commercial welding wire of the 5000 series. The weldability of the Al5083 base material was evaluated using high current metal inert gas (MIG) welding, using the developed Al5183 and commercial Al5183 welding wire...... More

Direct Laser Deposition of 14Cr Oxide Dispersion Strengthened Steel Powders Using Y<sub>2</sub>O<sub>3</sub> and HfO<sub>2</sub> 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
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

Hot Deformation Behavior of As-cast Low Nickel Fe-22Cr-9.5Mn-3.3Ni Austenite Steel
니켈감량 Fe-22Cr-9.5Mn-3.3Ni 오스테나이트강 주조재의 고온 변형성
Sang Yeon Ahn, Jae Sook Song, Sun Ig Hong
안상연, 송재숙, 홍순익
Korean J. Met. Mater. 2017;55(7):477-485.   Published online 2017 Jul 4
DOI: https://doi.org/10.3365/KJMM.2017.55.7.477

The hot deformation behavior of as-cast and homogenized Fe-22Cr-9.5Mn-3.3Ni stainless steel was investigated over a temperature range between 600~1,250 ℃. The deformability of the as-cast Fe-22Cr-9.5Mn-3.3Ni steel decreased with increasing temperature up to 850 ℃, and then increased at temperatures between 900 and 1200 ℃ caused by dynamic recrystallization at..... More

Phase Transformation Behavior of Oxide Particles Formed in Mechanically Alloyed Fe-5Y<sub>2</sub>O<sub>3</sub> Powder
Fe-5Y2O3 조성의 기계적 합금화 분말에 형성된 산화물의 상변태 거동
Ga Eon Kim, Jung-Sun Choi, Sanghoon Noh, Suk Hoon Kang, Byoung Kwon Choi, Young Do Kim, Tae Kyu Kim
김가언, 최정선, 노상훈, 강석훈, 최병권, 김영도, 김태규
Korean J. Met. Mater. 2017;55(5):357-362.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.357

The phase transformation behavior of the oxides formed in mechanically alloyed Fe-5Y2O3 powder is investigated. Non-stoichiometric Y-rich and Fe-rich oxides with sizes of less than 300 nm are observed in the mechanically alloyed powder. The diffusion and redistribution reactions of the elements in these oxides during heating of the powder..... More

Reduction Behaviors of Carbon Composite Iron Oxide Briquette Under Oxidation Atmosphere
산화성분위기에서의 탄재 내장 산화철 브리켓의 환원특성
Ki-Woo Lee, Kang-Min Kim, Jae-Hong Kwon, Sang-Han Son, Jeong-Whan Han
이기우, 김강민, 권재홍, 손상한, 한정환
Korean J. Met. Mater. 2017;55(1):24-30.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.24

The carbon composite iron oxide briquette (CCB) is considered a potential solution to the upcoming use of low grade iron resources in the ironmaking process. CCB is able to reduce raw material cost by enabling the use of low grade powdered iron ores and coal. Additionally, the fast reduction of..... More

Technical Developments and Trends of Earthquake Resisting High-Strength Reinforcing Steel Bars
내진용 고강도 철근의 제조와 기술 개발 동향
Byoungchul Hwang, Jae-Hyeok Shim, Myoung-Gyu Lee, Joonho Lee, Jun-Ho Jung, Bo-Sung Kim, Sung-Bin Won
황병철, 심재혁, 이명규, 이준호, 정준호, 김보성, 원성빈
Korean J. Met. Mater. 2016;54(12):862-874.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.862

Since reconstruction of old town in Korea requires high-rise and seismic design construction, many attentions have been paid to high strength seismic reinforced steel bar. In the present paper, technical developments and trends are summarized for developing next-generation seismic reinforced steel bar of grade 700 MPa. Steelmaking process requires high..... More

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