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A Study on the Influence of Laser Power on the Microstructure and Mechanical Properties of Functionally Graded Materials Produced by Direct Energy Deposition
고에너지 직접 적층법으로 제조된 경사조성재료의 미세조직 및 기계적 특성에 미치는 레이저 출력의 영향 연구
Giseung Shin, Ji hyun Yoon, Dae Whan Kim, Yongho Park, Jeoung Han Kim
신기승, 윤지현, 김대환, 박용호, 김정한
Korean J. Met. Mater. 2020;58(11):782-792.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.782

This study investigated the effects of laser power on the microstructure and mechanical properties of functionally gradient materials (FGM) produced by direct energy deposition. The FGM consisted of five different layers, which were a mixture of austenitic stainless steel (Type 316L) and ferritic steel (HSLA). During the direct energy deposition,..... More

Effects of Heat Treatment Condition and Counter Materials on the Wear Behavior of Laser Direct Energy Deposited Fe-8Cr-3V-2Mo-2W Alloy
레이저 직접적층법으로 제조된 Fe-8Cr-3V-2Mo-2W합금의 마모특성에 미치는 열처리공정 및 상대재의 영향
Kyeongsik Ha, Young Keun Park, Taehwan Kim, Gyeong Yun Baek, Jong Bae Jeon, Do-sik Shim, Young Hoon Moon, Wookjin Lee
하경식, 박영근, 김태환, 백경윤, 전종배, 심도식, 문영훈, 이욱진
Korean J. Met. Mater. 2020;58(10):680-692.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.680

This study aimed to investigate the wear performance of laser direct energy deposited Fe-8Cr3V-2Mo-2W alloy under various wear environments, in terms of different heat treatment conditions. Ball on disk tribology tests were performed using high-carbon steel and zirconia balls as counter materials. The wear rates of the alloy depended significantly..... More

Causes and Measures of Fume in Directed Energy Deposition: A Review
Directed Energy Deposition에서 흄의 생성 원인 및 대책
Kang-Hyung Kim, Chan-Hyun Jung, Dae-Yong Jeong, Soong-Keun Hyun
김강형, 정찬현, 정대용, 현승균
Korean J. Met. Mater. 2020;58(6):383-396.   Published online 2020 May 14
DOI: https://doi.org/10.3365/KJMM.2020.58.6.383

Pores and cracks are known as the main defects in metal additive manufacturing (MAM), including directed energy deposition(DED). A gaseous fume is often produced by laser flash (instantaneous high temperature) during laser processing, which may cause various defects such as porosity, lack of fusion, inhomogeneity, low flowability and composition change,..... More

Compressive Behavior of 316L Stainless Steel Lattice Structures Fabricated by Selective Laser Melting
SLM공정에 의해 제조된 316L 스테인레스 스틸 격자구조체의 압축 거동 평가
Jin-Myeong Lee, Jung-Eum Lee, Ji-Hoon Kim, Sang-Woo Kim
이진명, 이정음, 김지훈, 김상우
Korean J. Met. Mater. 2020;58(4):227-233.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.227

Lattice structures are multi-functional materials with various advantages such as high specific stiffness, high energy absorption capacity and good thermal management capability. Recently, the development of manufacturing technologies using metal powders has facilitated fabrication of complex products; consequently, interest in lattice structures has grown. In this work, two kinds of..... More

Anisotropy in Green Body Bending Strength due to Additive Direction in the Binder-Jetting Additive Manufacturing Process
Ji-Won Oh, Sahn Nahm, Byoungmoon Kim, Hanshin Choi
Korean J. Met. Mater. 2019;57(4):227-235.   Published online 2019 Apr 5
DOI: https://doi.org/10.3365/KJMM.2019.57.4.227

The additive manufacturing (AM) process is a production technology process that has recently attracted attention. Among AM processes, the binder jetting (BJ) method is advantageous because it allows both wide material selection and design freedom. However, the output arrangement, which determines the direction in which the binder is injected during..... More

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