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Microstructural Analysis of Solder Bump Fabricated by Sn Electroplating on a PCB Substrate
Sn 도금을 통한 PCB 기판상의 솔더 범프 제작 및 미세조직 분석
Sang-Hyeok Kim, Seong-Jin Kim, Han-Kyun Shin, Hyun Park, Cheol-Ho Heo, Seongjae Moon, Hyo-Jong Lee
김상혁, 김성진, 신한균, 박현, 허철호, 문성재, 이효종
Korean J. Met. Mater. 2021;59(4):233-238.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.233

Abstract
To manufacture finer solder bumps, the SR and DFR patterns were filled using a Sn electroplating process instead of the microball process currently used in BGA technology, and the solder bump shape was fabricated through a reflow process. The microstructure of the solder bump was investigated by EBSD and TEM..... More

                        
Investigation of the Texture and Dislocation Behavior of AZ31 Magnesium Alloy Under Different Strain Rate Conditions
변형률 속도에 따른 AZ31 Mg 합금의 집합조직 및 전위 거동 관찰
Dong-Gi Lee, Jun-Beom Kwon, Hyun-Jong Lee, Su-Mi Jo, Young-Mok Rhyim, Won-Jon Yang, Yang-do Kim
이동기, 권준범, 이현종, 조수미, 임영목, 양원존, 김양도
Korean J. Met. Mater. 2019;57(5):279-288.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.279

Abstract
This study is concerned with the influence of strain rate on the plastic deformation behavior and microstructure variables of AZ31 magnesium alloy sheet. The tensile properties were measured at room temperature at a strain rate of 0.001 and 100 s–1 using a universal tensile testing machine and servo-hydraulic high-speed tensile..... More

                           Cited By 1
Effect of Thermo-mechanical Treatment on the Formation Behavior of Martensite in 316L Stainless Steel
316L 스테인리스강에서 마르텐사이트 생성거동에 미치는 가공열처리의 영향
Jong-Sig Kim, Jae-Nam Kim, Chang-Yong Kang
김종식, 김재남, 강창룡
Korean J. Met. Mater. 2018;56(4):265-271.   Published online 2018 Apr 5
DOI: https://doi.org/10.3365/KJMM.2018.56.4.265

Abstract
This study was carried out to investigate the effect of thermo-mechanical treatment on the formation behavior of martensite in 316L stainless steel. Dislocation, α' and ε-martensite were formed by thermo-mechanical treatment. Martensite with surface relief and specific direction was formed by thermo-mechanical treatment. Martensite formed by thermo-mechanical treatment were reversed..... More

      
Effect of the Number of Cold Rolling Passes on the Formation of {110}<001> Goss-Oriented Grains in Fe-3.2 wt% Si Electrical Steel
Fe-3.2 wt% Si 방향성 전기강판에서 냉간압연 횟수가 집합조직과 {110}<001> Goss 결정립 형성에 미치는 영향
Soeng-Ho Jeon, No-Jin Park
전성호, 박노진
Korean J. Met. Mater. 2018;56(2):130-136.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.130

Abstract
An excellent grain-oriented electrical steel is composed of grains with exact Goss orientation. In order to produce this, it is important to control the Goss-oriented grains during the cold-rolling process. In this study, textures measured by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) were analyzed for 1, 10, and..... 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

Abstract
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
Evolution of the Solidification Microstructures in Directionally Solidified CM247LC Rod
CM247LC 초내열합금에서 일방향응고에 따른 응고조직 변화
Jeongseok Lee, Seokhwan Kown, Byunggwan Yoon, Byungmoon Chang, Yongil Jung, Jehyun Lee
이정석, 권석환, 윤병관, 장병문, 정연길, 이재현
Korean J. Met. Mater. 2016;54(11):838-845.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.838

Abstract
Directional solidification of CM247LC was performed at a constant growth velocity (300 mm/h) using a Bridgman type furnace. Microstructural features, including the number of grains, PDAS, and EBSD IPF map, were investigated with progressive positions from the starter block. As directional solidification proceeded, the number of grains decreased and PDAS..... More

         Cited By 4
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