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A357합금에서 용탕처리가 미세조직 및 기계적 특성에 미치는 영향
이정무 ( Jung Moo Lee ),이성학 ( Sung Hak Lee ),윤지현 ( Ji Hyun Yoon ),김경현 ( Kyung Hyun Kim ) 한국주조공학회 2003 한국주조공학회지 Vol.23 No.2
N/A The present work was undertaken to investigate the mutual effect of the individual melt treatment commonly applied in aluminum foundries such as grain refining, modification, degassing and filtration on the microstructures and the mechanical properties. A357 alloys were fabricated through various melt treatments such as degassing by gas bubbling filtration, modification via the addition of Al-Sr master alloy, grain refining through the addition of Al-Ti-B master alloy and filtration before pouring of the melt. Each melt treatment was performed at its optimum condition reported in the literatures. The effects of each melt treatment and their interactions on the microstructures and mechanical properties of A357 alloy were examined.
Al-10%Si-0.3%Mg 주조재의 보수용접에 따른 내구특성 연구
김경현,이정무 ( Kyung Hyun Kim,Jung Moo Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.6
N/A The effects of weld repair on the durability in Al-10%Si-0.3%Mg castings were evaluated. The strength and fracture toughness in fusion zone were higher than those in the base metal by rapid cooling of fusion zone after welding. There were no significant differences between fatigue properties in castings and weld repaired specimen as the results of low cycle fatigue and rotating bending fatigue test. Therefore it was concluded that weld repairing did not have any significant effect on the mechanical properties of castings.
Al-10%Si-0.3%Mg 합금에서 Sr 첨가가 미세조직 및 기계적 성질에 미치는 영향
김경현,이정무,정신검 ( Kyung Hyun Kim,Jung Moo Lee,Shin Kum Jung ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.1
N/A The effects of strontium content as modifier on microstructure and mechanical properties were studied in Al-10%Si-0.3%Mg cast alloys. There were not big differences in the form of eutectic Si particle and its morphology depending on adding amount of strontium, but the alloy modified by 0.012%Sr had shown the higher values than the alloy modified 0.038%Sr in strength, elongation and impact value.
시화호와 주변해역에서 채집한 어류 및 이매패류 내 중금속 함량 연구
나공태(Kongtae Ra),김경태(Kyung-Tae Kim),이정무(Jung-Moo Lee),방재현(Jae-Hyun Bang),윤민상,김은수(Eun-Soo Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
본 연구에서는 시화호 내측 및 외측에 서식하는 수산물(패류 및 어류) 체내 중금속 농도를 분석하여 위해성 평가를 실시하였다. 진주담치 내 Cr, Co, Cu 농도는 시화호 내측 평균농도가 외측에 비해 다소 높았으나 Cd와 Pb는 시화호 외측해역에서 채집한 진주담치 내 체내 농도가 내측에 비해 높은 것으로 나타났다. 굴의 경우, 평균적으로 외측해역에서의 농도가 내측에 비해 높았으며, 특히 Cu는 시화 외측에서의 평균농도가 49.94 ㎍/g으로 내측의 평균 15.04 ㎍/g에 비해 약 3배 높았고, Zn, As 및 Cd 역시 외측이 내측에 비해 각각 약 2배, 3배, 2.6배 높은 것으로 나타났다. 진주담치와 굴 모두 각국의 수산물 안전기준을 이하의 농도를 보였다. 어류 역시 다른 패류와 마찬가지로 우리나라 수산물 안전기준을 초과하지 않는 것으로 나타났으나 전어의 경우, Cr을 제외하고는 내장(intestines)에서 근육(muscle)과 간(liver)에 비해 높은 농도를 보였으며, 구리 및 아연의 농도가 상대적으로 높아 장기적인 섭식은 해로울 것으로 사료된다. The heavy metal concentrations in soft tissue of bivalve (mussel and Oyster) and fishes collected from Lake Shihwa and the outer sea were studied to assess the metal contamination and to evaluate the risk assessment and management for human health in the residents using marine organisms that can be useful as a marine food resources. Metal concentrations such as Cr, Co and Cu of mussel collected from Lake Shihwa were higher than those from outer sea whereas Cd and Pb concentrations from outer sea were higher than those from Lake Shihwa. For Oyster, metal concentrations such as Cu, Zn, As and Cd from outer sea were 2-3 times higher than those from Lake Shihwa. The average concentrations for heavy metals of Mytilus edulis and Oyster spp. was not exceeded the marine products safety standard. Similar to bivalue, metal concentrations of fishes collected from study areas were below the marine products safety standard. The average concentrations of metal in different tissues of fishes was descending order: intestines>liver>muscle. Because Cu and Zn concentrations of fishes from study area were relatively higher than those from other regions in Korea, further studies such as short and long-term uptake of metals through fishes should be studied to minimize the potentially detrimental effects on human health.