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전기화학적 식각에 의한 Gr. 91 강의 표면 개질 연구
정재헌(Jaeheon Jeong),김주헌(Juheon Kim),정경은(Kyungeun Jeong),이경준(Kyungjun Lee),김형모(Hyungmo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
A study was conducted on fabrication technology to form a microstructure of Grade 91 steel using an electrochemical etching process. We observed the morphology of surface structures according to the process parameters such as electrolyte concentration, applied voltage, and reaction time. The generated microstructures were greatly affected by the electrolyte concentration and current density rather than the reaction time. Each condition was combined to form a unique morphology that has both micro-scaled valley-like channels and micro-hole structures. In order to figure out the effect of unique morphology, a capillary rise characteristic was measured using infrared thermometry. The experiments showed enhancement of the capillary performance due to the unique microstructure by the proposed surface modification technique. This can be applied to components using Grade 91 steel, such as heat exchangers and steam generators operating in a high-temperature environment.
전기화학적 식각에 의한 Gr. 91 강의 표면 개질 연구
정재헌(Jaeheon Jeong),김주헌(Juheon Kim),정경은(Kyungeun Jeong),이경준(Kyungjun Lee),김형모(Hyungmo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
A study was conducted on fabrication technology to form a microstructure of Grade 91 steel using an electrochemical etching process. We observed the morphology of surface structures according to the process parameters such as electrolyte concentration, applied voltage, and reaction time. The generated microstructures were greatly affected by the electrolyte concentration and current density rather than the reaction time. Each condition was combined to form a unique morphology that has both micro-scaled valley-like channels and micro-hole structures. In order to figure out the effect of unique morphology, a capillary rise characteristic was measured using infrared thermometry. The experiments showed enhancement of the capillary performance due to the unique microstructure by the proposed surface modification technique. This can be applied to components using Grade 91 steel, such as heat exchangers and steam generators operating in a high-temperature environment.