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발전플렌트용 9Cr 페라이트 내열강의 미세조직과 강도특성
강창룡,성장현,이종문,이규현,이문용 한국열처리공학회 2000 熱處理工學會誌 Vol.13 No.1
This present study were investigated effect of Ni contents on the microstructure and strength characteristic in 9Cr ferritic heat-resistant steel added 1.7%W in place of Mo in order to restrain laves phase formation. The result obtained from this study are as follow. Volume fraction, number of particles per unite area and particle size of carbide decreased with increase of Ni contents. Other side, carbides of M_(23)C_6 type was mainly precipitated in this steel, but laves phases could not precipitated in spite of increasing of aging time. With increase of tempering temperature, hardness was increased, and maximum value was showed around 873k by secondary hardening due to precipitation of W₂C type carbide and then, was decreased. Tensile and yield strength due to decrease precipitation amount of carbide and number of particles per unite area was decreased, but elongation and impact value was increased. In case of aged specimen after tempering than tempered specimen, strength was higher and elongation was lower due to increasing of precipitated amount of carbide and number of particles per unite area
아크 소호용 세라믹 분말을 이용한 높은 차단용량 및 고내구성을 갖는 초소형 퓨즈 설계
강창룡,진상준,이예지,윤재서,노성여,Kang, Chang yong,Jin, Sang Jun,Lee, Ye Ji,Youn, Jae Seo,Noh, Seong yeo 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.4
Recently, inverter control systems have attracted immense attention to increase the energy efficiency. However, such systems use repeated on/off high currents for linear operation control, instead of the prevalent step variable current control method. Hence, there arise concerns of personal and property damage, especially due to the durability, explosive characteristics, and operating speed of the fuse, which is responsible for safety and is one of the internal components using current control. Therefore, in this paper, we propose an IEC60127-4 SMD sub-miniature fuse, consisting of Ag-Cu alloys and ceramic powder for arc soothing. The IEC60127-4 SMD sub-miniature fuse has high durability and cut-off capacity, and operates safely in dangerous circumstances caused by the inverter control system.
오스템퍼드 구상흑연 주철의 기계적 성질 및 파괴특성에 미치는 오스템퍼링 온도의 영향
강창룡,김창규 ( C . Y . Kang,C . G .Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.4
This study was performed to investigation the effect of austempering temperature on the mecanical properties and fracture Characteristic of the ductile cast iron with contains Cu and Mo. The obtained results of this study were as follows; Microstructure of austemped ductile cast iron obtained by sustempering were low bainite with some martensite at 250℃, mixture of low and upper bainite at 300℃ and upper bainite at 350℃. With increasing austempering temperature, yield strength, tensile strength and hardness decreased, while the elongation and impact absorption energy increased. With increasing austempering temperature, fracture toughness value increased and mainly controlled by bolume fraction of retained austenite. The volume fraction of retained austenite increased and the fracture surface obtained fibrous and dimple with increasing austempering temperature.
강창룡,주동원,성장현,김익수,배동수,官原一載 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.11
This study investigated the effect of aging treatment, Co addition and stress on the precipitation of Laves phase in 10Cr-6W ferritic heat-resistant steel for ultra-super critical pressure power generating plants. The hardness change during the aging treatment has shown two peaks. Ductility and toughness rapidly decreased by the very fine disk-like Laves phase precipitates at initial stage of aging. As aging time gets longer, Laves phase has precipitation, which brings out strength's increase, on the other hand elongation and impact value decrease. Content of Laves phase precipitates increased with addition of Co. The stress during the aging enhanced the Laves phase precipitates, and content of Laves phase precipitates and particle numbers per unite area enlarged by increasing of stress.
심랭 처리된 오스템퍼드 구상흑연주철의 기계적 성질에 미치는 Cu의 영향
강창룡 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.1
This study was investigated the effect of the Cu addition and subzero treatment in austempered ductile cast iron. With increasing austempering time, volume fraction of retained austenite increased and is decreased after showed the peak value. Specimen with more Cu contents had a less quantity of retained austenite. Retained austenite transformed to martensite by subzero treatment. With decreasing subzero treatment temperature, retained austenite of specimens with more Cu contents transformed more Cu contents transformed more to martensite. With decreasing subzero treatment temperature the value of strength and hardness increased but the value of elongation and impact decreased. In this study, we could find that in subzero treated specimens an addition of Cu had a little of effect on the strength and the hardness but had very much effect on the value of the impact.
시효전 템퍼링처리가 페라이트계 내열강의 미세조직과 기계적 성질에 미치는 영향
강창룡,김재환,김익수,서장현,배동수,이해우 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.5
This study investigated the effect of the tempering before aging on the precipitation of Laves phase and mechanical properties of 10Cr-6W and 10Cr-6W-3Co ferritic heat-resistant steels. Laves phase was precipitated by aging, which increase tensile strength but decreased elongation and impact value. Toughness was rapidly decreased by the presence of the very fine disk-like Laves phase precipitated at early aging stage. Strength and impact value were decreased by tempering treatment and that is due to the increase of the particle number per unite area and to larger particle size of Laves phase. Laves phase increased by adding Co, and consequently strength was increased and elongation and toughness were decreased. (Received February 26, 2004)