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Investigation of the Mechanical/Thermal Properties of Nano-Scale Silicon Nitride Membranes
나노스케일 질화규소 멤브레인의 기계적, 열적 특성 분석
Yong Ju Jang, Hyeon-Jin Shin, Seong Ju Wi, Ha Neul Kim, Gi Sung Lee, Jinho Ahn
장용주, 신현진, 위성주, 김하늘, 이기성, 안진호
Korean J. Met. Mater. 2019;57(2):124-129.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.124

In micro/nano electro-mechanical system, silicon nitride (SiNx) membrane has been widely used in sensors, energy harvesting and optical filters because of its mechanical/chemical stability. However, it is necessary to verify mechanical and thermal properties of nanoscale SiNx membranes to ensure the desirable reliability and durability of a device because the..... More

Influence of Boron and Manganese on Hot Crack Resistance and Low Temperature Toughness of Flux Cored Arc Weld Metal for High Strength Carbon Steels
고강도 탄소강 FCA 용착금속의 고온균열 저항성과 저온 충격인성에 미치는 보론과 망간의 영향
Su-Kil Park, Young-Ho Cho, Chun-Ho Jee, Junghoon Lee, Seong-Moon Seo, Namhyun Kang
박수길, 조영호, 지춘호, 이정훈, 서성문, 강남현
Korean J. Met. Mater. 2019;57(1):28-37.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.28

The hot crack resistance and mechanical properties of flux cored arc (FCA) welds were investigated with three kinds of welding consumables having different boron (B) and manganese (Mn) contents for high strength carbon steel. The hot crack resistance, measured from self-restraint testing, strongly depended on the amount of B in..... More

Comparison Between Multi-Axial Forging and Multi-Axial Diagonal Forging of AA1100 Using Finite Element Analysis
유한요소해석을 이용한 AA1100의 다축 단조와 다축대각 단조의 비교
Hyo-Tae Jeong, MinSeong Kim, SangChul Kwon, SunTae Kim, Seong Lee, Shi-Hoon Choi
정효태, 김민성, 권상철, 김순태, 이성, 최시훈
Korean J. Met. Mater. 2019;57(1):18-27.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.18

The effect that forging routes (3 routes, A-C) exert on the development of deformation heterogeneity in AA1100 was theoretically performed using finite element analysis. Route A corresponded to a forging process that involved from 1 to 6 passes through multi-axial diagonal forging (MADF); Route B corresponded to a forging process..... More

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

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

Effect of MgO Addition on the Monoclinic to Tetragonal Transition of ZrO<sub>2</sub> Fabricated by High Energy Ball Milling
Ashutosh Sharma, Byungmin Ahn
Korean J. Met. Mater. 2018;56(10):718-726.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.718

In this work, we studied the formation of partially stabilized zirconia by a high energy ball milling (HEBM) approach. Zirconia powder was mixed with 8 mol% MgO and the powder mixture was milled for 10 hours. The structural and morphological evolutions of the powder particles were studied using X-ray diffraction..... 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

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