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레이저 스팟 사이즈 및 공정 변수에 따른 금속분말(SUS316L) 적층 단면 특성 분석
신성선(SeongSeon Shin),이종훈(JongHoon Lee),김성욱(SungWook Kim),황준호(JunHo Hwang),김현덕(HyunDeok Kim) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.5
This study looks into the significant effects of laser beam spot size in the directed energy deposition of SUS316L stainless steel, to determine optimal conditions. In the paper, the beam spot size was varied and measured by adjusting the vertical displacement of the focal point. The experimental test results, specifically optical microscope images, showed that the cross-sectional view of the deposited layer was clearly different when the focal length was changed. Also, the paper investigates the effect of other process parameters such as laser power output, powder feeding rate and gas feeding rate on the directed energy deposition process. An experimental test showed that feeding powder loss was increased when the gas feeding rate and powder feeding rate were increased. This paper also includes experimental test results showing that the dilution ratio and heat-affected zone rely on the laser power outputs.
고에너지 직접적층제조 (DED) 공정에 의한 석출경화형 STS630 소재의 적층 최적화 연구
권용재(Yongjae Kwon),신성선(SeongSeon Shin),주상은(SangEun Joo),이종훈(JongHoon Lee),황준호(JunHo Hwang),김현덕(HyunDeok Kim) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.6
The quality and properties of products manufactured using metal three dimensional (3D) printing technology differs based on the process parameters. In addition, the characteristics and uses vary depending on the material used. In this study, the Direct Energy Deposition(DED) technology using a precipitation hardening type STS630 was investigated. The experimental process parameters, namely, the beam size, powder feeding rate, laser header moving speed, laser output power were set, and the deposition height and dilution were analyzed through deposition crosssection analysis after experiments according to each Additive Manufacturing(AM) process variable. The results showed that the deposition height decreased as the laser header moved faster. It was further observed that the dilution ratio and the width of the heat affected zone depended on the laser power and powder feed rate. The optimal process parameters were identified as a beam size of 1 ㎜, powder feeding rate of 6 g/min, laser header moving speed of 500 ㎜/min, and a laser output power of 500 W.
공정 파라미터에 따른 금속분말(SUS316L, IN718) 레이저 적층 표면 및 단면 특성 분석
황준호(JunHo Hwang),신성선(SeongSeon Shin),이종훈(JongHoon Lee),김성욱(SungWook Kim),김현덕(HyunDeok Kim) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.3
The authors derived the criteria on the process parameters of laser depositions with metal powers(SUS316L & IN718) by evaluating the surface and cross-section properties of the deposition layers. The surface characteristics of the deposition layer are investigated through optical microscopy by controlling the process parameters of laser output, powder feeding rate and gas feeding rate. The cross-section characteristics were also analyzed after polishing and chemical etching process. As the gas feeding rate increased, the amount of powder loss increased and the difference in the dilution ratio and heat affected zone depending on laser outputs was observed. In addition, the powder feeding rate used in the experiment did not interfere with the energy absorption of the base material.
DED 금속 3차원 프린팅의 레이저 파워 피드백 제어에 따른 적층 물성 연구
김지언(ChiYen Kim),김지성(JiSung Kim),이호(Ho Lee),박민규(MinKyu Park),김성욱(SungWook Kim),신성선(SeongSeon Shin),황준호(JunHo Hwang),김현덕(HyunDeok Kim) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.2
This study conducted a comparative analysis of laser power feedback control by measuring the melting pool size and temperature in the Directed Energy Deposition (DED) of SUS316L, to identify the effect of a conventional melting pool monitoring system on 3D metal printing performance. In the study, a CLAMIR was used on a developing 3D metal printer to control the laser beam power by measuring the size and temperature of the melting pool using an IR camera. Test parts were built from same CAD model but under different conditions, specifically, with CLAMIR on and off. The parts were investigated three ways: by 3D scanning to measure geometric errors, CT scanning to look into pore creation and distribution, and tensile tests to analyze mechanical performance.