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Volume 61(10); Oct 2023
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Research Papers
721 Analysis of Precipitation Phase of Alloy1.4957 Heat-Resistant Steel for Gasoline Turbocharger
가솔린 터보차저용 Alloy1.4957 내열강의 석출 상 분석
Jong-Kwan Lee, Byeong-Joo Lee, Eon-Sik Lee
이종관, 이병주, 이언식
Korean J. Met. Mater. 2023;61(10):721-728.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.721

Recently, strengthened environmental regulations have required the downsizing of gasoline engines, and as a result, demand for gasoline turbochargers has rapidly increased. The vane of a turbocharger controls the flow of gases toward the turbine, and it is manufactured by powder metallurgy due to its complex shape. Gasoline engines have..... More

729 Effects of Intercritical Heat Treatment on the Temper Embrittlement of SA508 Gr.4N Ni-Cr-Mo High Strength Low Alloy Steels for Reactor Pressure Vessels
SA508 Gr.4N Ni-Cr-Mo계 고강도 원자로압력용기용 저합금강의 템퍼취화 거동에 미치는 이상영역 열처리의 영향
Seokmin Hong, Cho-Long Lee, Bong-Sang Lee, Hong-Deok Kim, Min-Chul Kim
홍석민, 이초롱, 이봉상, 김홍덕, 김민철
Korean J. Met. Mater. 2023;61(10):729-740.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.729

To analyze the effects of intercritical heat treatment on the temper embrittlement of SA508 Gr.4N steels, two model alloys with different phosphorus (P) contents were fabricated. Each sample was heat treated by applying a conventional heat treatment process (quenching-tempering) with/without an intercritical heat treatment process (IHT) and a step-cooling heat..... More

741 Effect of Strain Rate on Deformation Behaviors of Ti-12.1Mo -1Fe Metastable Beta Alloy
Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
In Kyeong Jin, Dong-Geun Lee
진인경, 이동근
Korean J. Met. Mater. 2023;61(10):741-747.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.741

The addition of expensive elements to β titanium alloys, which are widely used in the aerospace and automobile industries, causes their price to increase. Low-cost, high-strength alloy (Ti-12.1Mo-1.0Fe) was designed in this study and the compressive behaviors of this alloy were evaluated for application to automobile parts, etc. As a..... More

748 The Effect of Ni Interlayer Formation Plating Bath on the Suppression of Oxidation of Ag-Coated Cu Flakes
Ag 코팅 Cu 플레이크의 산화 억제에 미치는 Ni interlayer 형성 도금욕의 영향
Ji Hwan Kim, Jong-Hyun Lee
김지환, 이종현
Korean J. Met. Mater. 2023;61(10):748-759.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.748

To suppress Ag dewetting from around 200 oC in Ag-coated Cu (Cu@Ag) flakes, Ag and Ni-coated Cu (Cu@Ni@Ag) flakes were fabricated by successive Ni and Ag electroless plating. The Ni bath type was an important consideration to induce differences in the Ag dewetting and resultant Cu oxidation. An acid Ni..... More

760 Effects of Process Parameters on the Dimensions and Mechanical Properties of L-DED AISI 316L Stainless Steel
L-DED 공정으로 제조된 AISI 316L 스테인리스 스틸의 적층 형상 및 특성에 미치는 공정 변수의 영향
Jiyoung Park, Hyunji Nam, Qing-Ye Jin, Wookjin Lee
박지영, 남현지, Qing-Ye Jin, 이욱진
Korean J. Met. Mater. 2023;61(10):760-771.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.760

In this study, AISI 316L stainless steels were manufactured by the L-DED process with various laser scanning speeds and laser powers, in order to analyze how volumetric energy density (VED) can affect their final shape, microstructure and mechanical properties. Under various VED conditions, it was found that a higher VED..... More

772 Effect of Process Parameter and Scanning Strategy on the Microstructure and Mechanical Properties of Inconel 625 Superalloy Manufactured by Laser Direct Energy Deposition
레이저 직접 적층 공정으로 제조된 Inconel 625 초합금의 미세구조 및 기계적 특성에 공정 변수 및 스캔 전략이 미치는 영향
Hyunji Nam, Qing-Ye Jin, Jiyoung Park, Wookjin Lee
남현지, Qing-Ye Jin, 박지영, 이욱진
Korean J. Met. Mater. 2023;61(10):772-784.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.772

This study aimed to investigate the effect of process parameters on the microstructure and mechanical properties of Inconel 625 alloy manufactured by direct energy deposition process. The Inconel 625 samples were produced by varying the laser scanning speeds from 720 - 960 mm/min while maintaining the same the laser energy..... More

785 Optimization of Sintering Temperature for the Synthesis of n-type Mg3SbBi0.99Te0.01 Thermoelectric Materials
소결온도 최적화에 의한 Mg3SbBi0.99Te0.01 n형 소재의 열전특성 향상
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bong-Seo Kim, Bok-Ki Min
주성재, 손지희, 장정인, 김봉서, 민복기
Korean J. Met. Mater. 2023;61(10):785-792.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.785

Mg3Sb2-based materials are promising candidates to replace n-type Bi2Te3 for cooling and power generation at low temperatures. Generally, the thermoelectric performance of a material is sensitively affected by synthesis process parameters, and among them, sintering temperature (Ts) is a critical one. In this study, n-type Mg3SbBi0.99Te0.01 polycrystalline samples were fabricated..... More

793 Piezoresistive Characteristics of Carbon Nanotube Polymer Composites with Different Filler Content and Aspect Ratio for Pressure Sensors
압력 센서용 탄소 나노 튜브 폴리머 복합체의 필러 함량과 종횡비에 따른 압저항 특성
Jongchan Yoo, Dong-Young Kim, Dong-Kwan Lee, Kunwoo Nam, Sung-Hoon Park
유종찬, 김동영, 이동관, 남건우, 박성훈
Korean J. Met. Mater. 2023;61(10):793-799.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.793

Polymer composites enriched with conductive fillers hold immense potential for flexible pressure sensors, because of the remarkable piezoresistive effect they possess. Research on polymer composite pressure sensors has been actively ongoing because of their flexibility and high electrical resistance performance. This paper presents a comprehensive comparison of the piezoresistive characteristics..... More

800 Influence of Elevated Temperature on the Mechanical and Microstructural Properties of Glass Fiber-Reinforced Polymers
Se Woong Lee, Seulgi Han, Okmin Park, Sang-il Kim, Sungmo Choi
Korean J. Met. Mater. 2023;61(10):800-806.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.800

Glass fiber-reinforced polymers (GFRPs) have attracted significant attention as structural materials because of their high fatigue resistance, corrosion resistance, strength, and stiffness. This study examined the effect of elevated temperatures (150, 250, 350, and 450oC) on the microstructural and mechanical properties of GFRP plates. The number of bubbles increased as..... More

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