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Korean J. Met. Mater.
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Research Papers
319
Strengthening Mechanism of Cold-Rolled Co-Based Super Alloy for Diaphragm Valves under Room Temperature Tensile Loading
다이어프램 밸브용 Co계 초합금 냉간 압연재의 상온 인장 특성에 대한 강화 메커니즘 연구
Jung-Hyun Park, Noh-Geon Song, Jae-Ho Choi, Doo-Hong Kang, Kee-Ahn Lee박정현, 송노건, 최재호, 강두홍, 이기안
Korean J. Met. Mater.
2025;63(5):319-329. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.319
Abstract
Cold-rolled Co-Cr-Ni alloy (Elgiloy) and Co-Ni-Cr alloy (SPRON 510) can be considered for diaphragm valve materials in gas valve systems. In this study, the effect of direct aging (DA) heat treatment on the tensile properties of Co-based alloys was investigated and the influence of microstructural changes on the tensile behavior.....
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330
Analysis of Thermal Aging Behavior and Activation Energy of Austenitic Stainless Steel Weld for Reactor Vessel Internal
원전 내부구조물 오스테나이트 스테인리스강 용접부의 열시효 거동 및 열취화 활성화에너지 분석
Yoojin Kim, Ji-Su Kim, Joowon Suh, Jongmin Kim, Soo Yeol Lee, Seokmin Hong김유진, 김지수, 서주원, 김종민, 이수열, 홍석민
Korean J. Met. Mater.
2025;63(5):330-343. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.330
Abstract
This study examines the thermal aging behavior and associated changes in mechanical properties of austenitic stainless steel welds (ASSW) used within reactor vessel internals (RVI). ASSW specimens were fabricated employing the Gas Tungsten Arc Welding (GTAW) technique, adhering to the welding procedure specifications for RVI, and were thermally aged at.....
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344
Comparison of Low Cryogenic Impact Toughness and Microstructure of GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) Weld Zone in 304L Stainless Steel for Liquid Hydrogen Tank
액화수소 저장 용기 제작을 위한 304L 스테인리스 강의 GMAW (Gas Metal Arc Welding) 및 GTAW (Gas Tungsten Arc Welding) 용접부의 초저온 충격인성 및 미세조직 비교
JaeHan Park, JeongYeol Park, YangDo Kim, ChangWook Ji박재한, 박정열, 김양도, 지창욱
Korean J. Met. Mater.
2025;63(5):344-355. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.344
Abstract
To combat global climate change caused by CO
2
emissions, achieving net-zero emissions through sustainable energy solutions is a global priority. Among alternative energy carriers, hydrogen is a promising renewable energy source due to its efficiency in production, transportation, and storage. Liquefied hydrogen (LH
2
) transportation is gaining attention as it significantly.....
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356
Correlation Between Solidification Cracking and Composition Distribution in Green Laser Welds of Lithium-Ion Battery Busbars
그린레이저를 이용한 리튬 이온 배터리 버스바 용접부의 응고균열과 성분 분포 상관관계
Ye-Ji Yoo, Jeong-Hoi Koo, Hee-Shin Kang, Eun-Joon Chun유예지, Jeong-Hoi Koo, 강희신, 천은준
Korean J. Met. Mater.
2025;63(5):356-369. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.356
Abstract
This study investigates the solidification cracking susceptibility of Cu-Steel laser welds used for cylindrical lithium-ion battery busbars. The research utilized green laser technology with three distinct beam patterns: Linear, Spiral + Wobble, and Circular + Wobble. Additionally, Ni-P coating layers of varying thicknesses (10, 50, 100 μm) were applied to.....
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370
Effect of Sn Content on Solidification Microstructure and Cracking in Cu-Sn Brazed Joints
Sn 조성 변화가 Cu-Sn 브레이징 접합부의 응고조직과 균열에 미치는 영향
Byungrok Moon, Seonghoon Yoo, Byeong Hwi Lee, Won Sik Hong, Jinwook Jeong, Namhyun Kang문병록, 유성훈, 이병휘, 홍원식, 정진욱, 강남현
Korean J. Met. Mater.
2025;63(5):370-379. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.370
Abstract
Solidification cracking in brazed joints is significantly influenced by solidification conditions and alloy composition, making it a critical factor for the reliability of parts and products. Numerous studies have been conducted to predict solidification cracking in processes like casting, welding, and joining, leading to the development of an index to.....
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380
Effect of Ni Content and Tempering Temperature on Hydrogen Embrittlement of SA372 Steels for Pressure Vessel
압력용기용 SA372강의 수소취성에 미치는 Ni 함량과 템퍼링 온도의 영향
Hee-Chang Shin, Byoungchul Hwang신희창, 황병철
Korean J. Met. Mater.
2025;63(5):380-388. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.380
Abstract
This study investigates the influence of grain boundary characteristics on hydrogen embrittlement in SA372 steels by varying Ni content and tempering temperature. Microstructural characteristics and mechanical properties were analyzed to understand hydrogen trapping behavior, followed by an in-situ slow strain-rate test (SSRT) to assess hydrogen embrittlement resistance and hydrogen-induced fracture.....
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389
Evaluation of Hydrogen Embrittlement Sensitivity with Respect to Crystallographic Orientation of Single Crystal Ni Base Alloys
단결정 Ni기 초합금의 결정방위에 따른 수소 취화 민감도 평가
Hee Soo Yun, Van Hung Dao, Hyusang Kwon, Jihun Lee, Seung Hoon Nahm윤희수, 다오반헝, 권휴상, 이지훈, 남승훈
Korean J. Met. Mater.
2025;63(5):389-398. Published online 2025 May 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.5.389
Abstract
As demand for hydrogen, a clean energy source, has increased, hydrogen embrittlement caused by hydrogen penetration into materials has became a major challenge. This study evaluated the effect of crystallographic orientation on hydrogen embrittlement sensitivity, using single-crystal Ni-based superalloys that are used in hydrogen gas turbines. The two crystallographic orientations.....
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