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Effect of Hot Stamping Heat Treatment Temperature on Resistance Spot Weldability of Al-10% Si Coated 30MnB5 Steel
핫스탬핑 열처리 온도가 Al-10% Si 도금 30MnB5 강의 점용접성에 미치는 영향
Seong Guk Son, Yeonjung Hwang, Chang Wook Lee, Ji Hong Yoo, Minsu Choi
손성국, 황연정, 이창욱, 유지홍, 최민수
Korean J. Met. Mater. 2019;57(12):778-786.   Published online 2019 Oct 8
DOI: https://doi.org/10.3365/KJMM.2019.57.12.778

Abstract
Hot stamping is the most efficient manufacturing process to produce high strength automotive parts with reduced springback. Recently, 30MnB5 steel has been developed for hot stamping steel which can provide above 1700 MPa. However, resistance spot weldability of this steel is insufficient due to the need for a large amount..... More

      
Low-Temperature H<sub>2</sub>S Sensors Based on Si-Coated SnO<sub>2</sub> Nanowires
Myung Sik Choi, Ali Mirzaei, Jae Hoon Bang, Han Gil Na, Changhyun Jin, Wansik Oum, Seungmin Han, Sang Sub Kim, Hyoun Woo Kim
Korean J. Met. Mater. 2019;57(11):732-740.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.732

Abstract
To attain high life standards, it is important to develop high-performance non-toxic gas sensors for public safety, environmental pollutant control, industrial processes, etc. Because reports on single element semiconductor-coated semiconducting metal oxides for sensing applications are rare, we synthesized SnO2 nanowires and coated them with a 5 nm-thick or 10..... More

                        
Study of the Corrosion Behaviour, Liquid Metal Embrittlement and Resistance Spot Weldability of Galvannealed Hot Stamping Steel
합금화 용융아연도금 핫스탬핑강의 자동차 차체 적용을 위한 부식 거동, 액상금속취화현상 및 점용접성 연구
Yeonjung Hwang, Chang Wook Lee, Ga-Young Shin, Ji Hong Yoo, Minsu Choi
황연정, 이창욱, 신가영, 유지홍, 최민수
Korean J. Met. Mater. 2019;57(3):193-201.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.193

Abstract
The hot stamping process is beneficial for fabricating high strength automotive parts without spring back. To suppress high temperature oxidation and decarburization, it is necessary to coat the hot stamping steel. In the present work, the performance of galvannealed coated (GA) hot stamped steel was evaluated. During cyclic corrosion tests,..... More

                        
Oxidation Behaviors of Alloys Containing /B2 Phases of Ti-45Al-Mo-Nb Alloys and Evaluation of the Oxidation Behaviors of Si Pack Cementation Coated Alloys
β/B2상을 포함한 Ti-Al-Mo-Nb 합금의 산화 거동과 실리콘 화합물 코팅을 통한 내산화성 개선
Kwangsu Choi, Youngbuem Song, Seonghoon Yi, Joon Sik Park
최광수, 송영범, 이승훈, 박준식
Korean J. Met. Mater. 2019;57(3):131-137.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.131

Abstract
Alloys containing the β/B2 phases of Ti-45Al-3Mo, Ti-45Al-3Mo-2Nb and Ti-45Al-5Mo were prepared using an vacuum arc-melting machine. Heat-treatments were carried out at 1250 oC in an Ar atmosphere. The temperature of 1250 oC is the temperature region of phase α + γ + (β/B2), and the heat treatment condition which..... More

                           Cited By 1
Corrosion Resistance and Adhesion of Paint Coating Film on Zn-Mg-Al Hot-Dip Galvanized Steel Sheets
아연-마그네슘-알루미늄 합금도금강판의 도장 내식성 및 밀착성
Jae-Won Lee, Bora Park, Sung Jin Kim
이재원, 박보라, 김성진
Korean J. Met. Mater. 2019;57(2):77-83.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.77

Abstract
Zn-Al-Mg alloy galvanized steel sheets have excellent corrosion resistance and improved cut-edge corrosion resistance. Most of the galvanized steel sheets used for outdoor applications are coated again on the galvanizing layer, or after a plastic film is laminated. As the corrosion products formed by the corrosion of Zn accumulate over..... More

                           Cited By 1
Rosette Strain Sensors Based on Stretchable Metal Nanowire Piezoresistive Electrodes
신축성 금속 나노선 압저항 전극 기반 로젯 스트레인 센서
Kang-Hyun Kim, Jae-Gyeong Cha, Jong-Man Kim
김강현, 차재경, 김종만
Korean J. Met. Mater. 2018;56(11):835-843.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.835

Abstract
In this work, we report a delta rosette strain sensor based on highly stretchable silver nanowire (AgNW) percolation piezoresistors. The proposed rosette strain sensors were easily prepared by a facile twostep fabrication route. First, three identical AgNW piezoresistive electrodes were patterned in a simple and precise manner on a donor..... More

                        
Microstructure of Rhenium Coatings Deposited by CVD on Graphite and Mo Substrates
흑연 및 Mo 기판 위에 CVD 성장된 Re 코팅층의 미세조직
Sun Kyu Lee, Dong Yun Nam, Nam Ho Bae, Sung Taek Lim, Yong-Jun Oh
이선규, 남동윤, 배남호, 임성택, 오용준
Korean J. Met. Mater. 2018;56(3):197-204.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.197

Abstract
Rhenium coatings were fabricated on a graphite substrate at 1100 and 1250 oC and a molybdenum substrate at 1150 and 1250 oC by chemical vapor deposition (CVD) using ReCl5 precursor, and the effects of deposition temperatures and substrates on microstructure and crystal orientation were investigated. The rhenium coating on graphite..... More

      
Effects of Feedstock Powder Characteristics on the Microstructural Features and Erosion Resistance of WC-12Co Coatings
분말소재 특성에 따른 고속화염용사 WC-12Co 코팅층의 미세조직 및 침식 저항성
So-Yeong Kang, Kyeong-Ho Baik, Sang-Hoon Yoon, Hyung-Jun Kim
강소영, 백경호, 윤상훈, 김형준
Korean J. Met. Mater. 2018;56(2):113-120.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.113

Abstract
WC-Co coatings manufactured by high velocity oxy-fuel (HVOF) spraying have a superior hardness and wear resistance. In this study, HVOF-sprayed WC-12Co coatings from three different feedstock powders were evaluated in terms of microstructural features, carbide decomposition and erosion resistance. The fused-crushed and the sintered-crushed WC-12Co powders had an angular shape,..... More

      
Study on the Part Unit Corrosion Evaluation for Automotive Lower Arm Using Electrochemical Cyclic Corrosion Test
전기화학적 순환부식 시험법을 활용한 자동차 로어암의 단품단위 부식평가에 관한 연구
Seon-Hong Kim, Ji-Hoon Lee, Jung-Gu Kim, Min Jang
김선홍, 이지훈, 김정구, 장민
Korean J. Met. Mater. 2018;56(2):103-112.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.103

Abstract
This research focused on the development of the part unit evaluation for an organic coated automotive lower arm using the electrochemical cyclic corrosion test (E-CCT). The E-CCT accelerates both the coating degradation and the perforation corrosion. The applied potential for the coating degradation was determined to be -500 mVSCE for..... More

      
Characteristics of NiOYSZ Gas Sensor Employing YSZ Solid Electrolyte Prepared by Thermal Spray Coating Method
용사코팅 YSZ 고체 전해질이 응용된 NiO・YSZ 가스센서의 특성
Il-Hwan Bang, Sung-Yong Cho
방일환, 조성용
Korean J. Met. Mater. 2017;55(11):819-824.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.819

Abstract
A mixed potential-type NiO・YSZ (yttria stabilized zirconia) gas sensor employing 8YSZ solid electrolyte film was fabricated using a thermal spray coating method, and tested in a NO2 atmosphere at various operating temperatures. The thermal spray coating method is useful for mass producing solid electrolytes without a forming, sintering or bonding..... More

      
Pulsed Electrodeposition of Thin Cobalt Coating Layer on Ferritic Stainless Steel for SOFC Interconnects
Suk-Chul Kwak, Byung Kyu Kim, Dong-Ik Kim, Young Whan Cho
Korean J. Met. Mater. 2017;55(11):768-776.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.768

Abstract
A thin, compact, and uniform cobalt layer was coated on ferritic stainless steel (Crofer 22 APU) by high frequency square pulsed electrodeposition in an aqueous solution containing cobalt chloride and boric acid. The effects of various electrodeposition parameters and post heat treatment on the morphology, thickness, roughness and adhesion of..... More

      
Near Infrared Reflecting Properties of TiO<sub>2</sub>/Ag/TiO<sub>2</sub> Multilayers Prepared by DC/RF Magnetron Sputtering
Sung Han Kim, Seo Han Kim, Pung Keun Song
Korean J. Met. Mater. 2017;55(8):581-586.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.581

Abstract
The near-infrared (NIR) reflecting properties of TiO2 /Ag /TiO2 (TAT) multilayers deposited using DC/RF magnetron sputtering were investigated. For high transmittance and reflectance in the visible and NIR ranges, respectively, the thickness of each layer was theoretically optimized by the index matching method. As the Ag layer thickness increased, the..... More

      
Effects of Dispersion Solvent on the Spray Coating Deposition of Silver Nanowires
스프레이 코팅법으로 증착된 은나노선의 특성에 미치는 분산용매의 영향
Ji-Hye Choe, A-Yeon Jang, Jeong-Heui Kim, Choong-Heui Chung, Ki-Ha Hong
최지혜, 장아연, 김정희, 정중희, 홍기하
Korean J. Met. Mater. 2017;55(7):509-514.   Published online 2017 Jul 4
DOI: https://doi.org/10.3365/KJMM.2017.55.7.509

Abstract
Silver nanowire (AgNWs) networks offer a promising approach for producing cost effective transparent electrode materials. However, high temperature annealing is necessary to achieve low sheet resistance, which limits the use of AgNWs for low temperature processing applications such as flexible electronics, and perovskites solar cell fabrication. This study shows that..... More

         Cited By 2
Synthesis of Cu-coated Graphite Powders Using a Chemical Reaction Process
화학반응법을 이용한 Cu-coated 복합분체 합성
Jun-Ho Jang, Hyun-Kuk Park, Jae-Won Lim, Ik-Hyun Oh
장준호, 박현국, 임재원, 오익현
Korean J. Met. Mater. 2017;55(5):315-319.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.315

Abstract
In this paper, Cu-coated graphite powders for a low thermal expansion coefficient and a high thermal conductivity are fabricated using a chemical reaction process. The Cu particles adhere to the irregular graphite powders and they homogeneously disperse in the graphite matrix. Cu-coated graphite powders are coarser at approximately 3~4 ㎛..... More

      
Factors Influencing Plasma Electrolytic Oxidation(PEO) Coatings on Magnesium Alloys: A Review
마그네슘 합금의 플라스마전해산화 코팅에 영향을 미치는 제반 요소들에 대한 고찰
Gunchoo Shim
심건주
Korean J. Met. Mater. 2017;55(5):296-307.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.296
Abstract
Magnesium alloys, which possess excellent specific strength and castability, are highly susceptible to corrosion. Although anodizing is widely used to resolve this problem, it requires toxic electrolytes and produces relatively thin and weak surface coatings. Recently, plasma electrolytic oxidation (PEO) has emerged as an alternative to anodizing. Although it is... More
         Cited By 3
The Effects of Particle Size on the Surface Properties of an HVOF Coating of WC-Co
WC-Co 초고속 화염용사코팅 표면특성에 미치는 분말입자의 크기
Tong Yul Cho, Jae Hong Yoon, Sang Hwan Yoon, Yun Kon Joo, Won Ho Choi, Young Bok Son
조동율, 윤재홍, 윤상환, 주윤곤, 최원호, 손영복
Korean J. Met. Mater. 2017;55(4):227-231.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.227

Abstract
The effects of particle size on the surface properties of HVOF spray coating were studied to improve of the durability of metal components. Micro and nano sized WC-12Co powders were coated on the surface of Inconel718, and the effects of particle size on surface properties were studied. Surface hardness was..... More

         Cited By 1
Effect of Added Magneisum on the Coating Properties of Galvanized Steel Sheets
용융아연 도금특성에 미치는 Mg 미량첨가 영향
Moon-Hi Hong, Deok-Gu Kang, Doo-Jin Paik, Hyeon-Seok Hwang, Sung-ho Park
홍문희, 강덕구, 백두진, 황현석, 박성호
Korean J. Met. Mater. 2016;54(10):723-731.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.723

Abstract
The effect of a small amount of added Mg on the microstructure, Fe-Al inhibition layer, corrosion resistance and welding properties of hot-dip galvanized and galvannealed steel sheets were investigated. Both the microstructure and distribution of Mg were measured by scanning electron microscopy, transmission electron microscopy, glow discharge spectrometer and electron..... More

         Cited By 1
Corrosion & Surface Treatment
Fabrication of Decorative Coating/Patterning of Ceramic Pigment Powder Using Vacuum Kinetic Spraying Process
진공상온분사 공정을 이용한 세라믹 도료 분말의 장식용 코팅 및 패터닝 제조
Hyungkwon Park, Jinyoung Kim, Hansol Kwon, Seongtae Lee, Changhee Lee
박형권, 김진영, 권한솔, 이승태, 이창희
Korean J. Met. Mater. 2016;54(8):552-558.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.552

Abstract
Vacuum kinetic spraying (VKS) is a relatively advanced process, by which a dense film can be fabricated at room temperature. Various materials including ceramic, metal, polymer and composite can be used as the substrate and coating materials. In this research, red and blue color films were successfully fabricated on glass..... More

      
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