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Table of Contents | September, 2016  Vol. 54   No.9 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
Mechanical Behavior
626 Effect of Alloying Elements on the Low-Cycle Fatigue Properties of Al-Si-Mg-(Cu) Alloys for the Cylinder Head of a Passenger Diesel Engine
승용디젤엔진 실린더 헤드용 Al-Si-Mg-(Cu) 합금의 저주기 피로 특성에 미치는 첨가원소 효과
Bo-Ra Jin, Chang-Yeol Jeong
진보라, 정창열
Korean J. Met. Mater. 2016;54(9):626-636.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.626

Abstract
To improve automobile fuel efficiency and reduce emissions, there has been a growing demand for more durable alloys for engine components with improved high temperature fatigue resistance. This study examined the effect of alloying elements on the high temperature mechanical behavior of Al-Si-Mg-(Cu) casting alloys for diesel cylinder heads. Depending..... More

         Cited By 2
637 Sensitivity of Microstructural Factors Influencing the Impact Toughness of Hypoeutectoid Steels with Ferrite-Pearlite Structure using Multiple Regression Analysis
다중회귀분석을 이용한 페라이트-펄라이트 조직 아공석강의 충격인성에 미치는 미세조직적 인자의 민감도 해석
Seung-Yong Lee, Sang-In Lee, Byoungchul Hwang
이승용, 이상인, 황병철
Korean J. Met. Mater. 2016;54(9):637-644.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.637

Abstract
In this study, the effect of microstructural factors on the impact toughness of hypoeutectoid steels with ferrite-pearlite structure was quantitatively investigated using multiple regression analysis. Microstructural analysis results showed that the pearlite fraction increased with increasing austenitizing temperature and decreasing transformation temperature which substantially decreased the pearlite interlamellar spacing and..... More

         Cited By 2
Corrosion & Surface Treatment
645 High Temperature Oxidation Behavior of Mg-5% Ca-1% Zn Alloys
Kwon Yong Ji, Dong Bok Lee
Korean J. Met. Mater. 2016;54(9):645-651.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.645

Abstract
Pure Mg, Mg-5wt%Ca, and Mg-5wt%Ca-1wt%Zn alloys were cast, and their high-temperature oxidation behavior was investigated to determine the roles of Ca and Zn in oxidation. Ca and Zn additions refined the microstructure by formation of Mg2Ca and Ca2Mg6Zn3, respectively, at grain boundaries. Ca increased the oxidation resistance by forming a..... More

         Cited By 2
652 Effect of Potassium Persulfate on Current Efficiency for Gold Plating
금도금의 전류효율에 미치는 과황산칼륨 첨가의 영향
Injoon Son, Ho-Sang Sohn, Kyung Tae Kim
손인준, 손호상, 김경태
Korean J. Met. Mater. 2016;54(9):652-658.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.652

Abstract
In this study, the effect of potassium persulfate on current efficiency for gold plating was investigated using electrochemical techniques. The current efficiency in the low-current-density range greatly decreased when potassium persulfate was added to the gold plating solution. However, the current efficiency in the high-current-density range did not change with..... More

         Cited By 1
Casting/Solidification/Heat Treatment
659 Solidification Segregation and Homogenization Behavior of 1Cr-1.25Mo-0.25V Steel Ingot
1Cr-1.25Mo-0.25V 강 잉곳의 응고편석 및 균질화 거동
Dong-Bae Kim, Young-Sang Na, Seong-Moon Seo, Je-Hyun Lee
김동배, 나영상, 서성문, 이재현
Korean J. Met. Mater. 2016;54(9):659-671.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.659

Abstract
As a first step to optimizing the homogenization heat treatment following high temperature upset forging, the solidification segregation and the homogenization behaviors of solute elements were quantitatively analyzed for 1Cr-1.25Mo-0.25V steel ingot by electron probe micro-analysis (EPMA). The random sampling approach, which was designed to generate continuous compositional profiles of..... More

      
672 Study on the Surface Microstructure of a Modified STD61 Steel Mold Used for the Die Casting Process
다이캐스팅 공정에 사용된 개량형 STD61 열간 금형 표면의 미세조직에 관한 연구
Ha-Young Yu, Seung-Joon Lee, Minwoo Kang, Suk-Jin Lee, Won Jon Yang, Jae Suk Jeong, Byung-Hoon Kim, Young-Kook Lee
유하영, 이승준, 강민우, 이석진, 양원존, 정재석, 김병훈, 이영국
Korean J. Met. Mater. 2016;54(9):672-680.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.672
Abstract
The surface microstructure and crack formation of an aluminum die-casting mold were investigated. The mold was made of a modified STD61 steel, and was used for more than 165,000 cycles. The mold surface consisted of four layers; an oxidized layer, a decarburized layer, a network carbide layer and a tempered... More
      
Electronic Materials
681 The Effects of Bis(3-Sulfo-Propyl)di-Sulfide (SPS) Additives on the Surface Morphology and Mechanical Properties of Electrolytic Copper Foil
전해 동박의 표면 형상 및 기계적 물성에 미치는 SPS 첨가제 영향
Tae-Gyu Woo
우태규
Korean J. Met. Mater. 2016;54(9):681-687.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.681

Abstract
In this study the effects of Bis(3-Sulfo-Propyl)di-Sulfide (SPS) on the elongation, surface morphology and crystal structure of electrolytic copper foil were investigated. Additives HEC (hydroxyethyl cellulose) (A), SPS(B), Coll-A(C) were used in the study, and the additive used as D was a Cl- ion. The study results show that there..... More

         Cited By 2
Composite Materials
688 Effect of Added Ni on the Deposition State of Kinetic Sprayed Al-Ni Composite
첨가된 Ni이 저온 분사된 Al-Ni 복합체의 적층 상태에 미치는 영향
Jaeick Kim, Seungtae Lee, Changhee Lee
김재익, 이승태, 이창희
Korean J. Met. Mater. 2016;54(9):688-697.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.688
Abstract
The liners of shaped charges, a type of weapon, should possess good penetration ability and explosive power. Conventionally this is achieved by fabricating reactive Al-Ni composite layers on the Cu liners, which by themselves have fine penetration ability but poor explosive power. However, there are no studies related to the... More
      
Materials Analysis & Characterization
698 Serial Sectioning and Reconstruction Techniques for Three-Dimensional Microscopy of Metallic Materials
금속 미세조직의 3차원 이미지 관찰을 위한 순차적 박리 및 재구성 기술
Su-Hyeon Kim, Youngmok Rhyim
김수현, 임영목
Korean J. Met. Mater. 2016;54(9):698-710.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.698

Abstract
Experimental techniques for serial sectioning and reconstruction were investigated in the three-dimensional imaging of microstructures in metallic materials. Mechanical polishing equipped with a light optical microscope and a digital image processor was used for the serial sectioning and reconstruction. Different processing conditions were investigated for three different alloys: Al-Si alloy,..... More

         Cited By 3
711 Transmission Electron Microscopic Analysis of Micro-Twin
미세쌍정의 투과전자현미경 해석
Kun Kul Ryoo, Mi-young Ha, Kang Deuk Lee
류근걸, 하미영, 이강득
Korean J. Met. Mater. 2016;54(9):711-715.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.711

Abstract
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking..... More

         Cited By 1
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