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Mechanical properties of CO2/MIG welded structural rolled steel and stainless steel
임종영,윤명진,김상윤,신현승,김태규 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
To accomplish long-term use of specific parts of steel, welding technology is widely applied. In this study, to compare the efficiency inimproving mechanical properties, rolled steel (SS400) was welded with stainless steel (STS304) by both CO2 welding method and MIG(metal inert gas) welding method, respectively. Multi-tests were conducted on the welded specimen, such as X-ray irradiation, Vickers’Hardness, tensile test, fatigue test and fatigue crack growth test. Based on the fatigue crack growth test performed by two different methods,the relationship of da/dN was analyzed. Although the hardness by the two methods was similar, tensile test and fatigue properties ofMIG welded specimen are superior to CO2 welded one.
구조용 압연강재와 스테인리스강재의 CO<sub>2</sub> 용접에 대한 기계적 특성연구
임종영,윤명진,김태현,김상윤,김태규,Lim, Jong Young,Yoon, Myung Jin,Kim, Tae Hyun,Kim, Sang Youn,Kim, Tae Gyu 한국결정성장학회 2013 韓國結晶成長學會誌 Vol.23 No.4
산업시설에는 용접된 구조물에 반복 하중이 발생하여 피로파괴가 발생하고 있는데 이 피로파괴를 줄이기 위해 일반구조용압연강재(SS400)와 스테인리스강(STS304)을 $CO_2$ 용접하여 기계적 특성 분석을 하였다. X-ray 촬영을 하여 결함검사를 하고 용접부에 결함이 없는 시험편으로 경도, 인장, 피로 시험을 하였다. 경도는 SS400과 STS304가 용접된 시험편이 SS304만 용접된 시험편보다 높게 나타났다. 그리고 인장강도와 항복강도는 반대로 SS304만 용접된 시험편이 높았으며 피로한도 또한 마찬가지였다. 따라서 $CO_2$ 용접을 할 경우 융점이 낮고 용접성이 좋은 SS400만으로 용접할 때 더 좋은 성능을 보여준다. It is well known that fatigue failure occur on welded structures in industrial application due to the repetitive load force. In order to decrease the fatigue failure, we analysed the mechanical properties based on their structural aspect, roll steel (SS 400) welded onto stainless steels (STS 304) by $CO_2$ gas as well as structure roll steel welded onto itself. We compared the hardness, tensile and fatigue properties with two kinds of samples which had no defects on the welding part observed by X-ray topographic analysis. It was recognized that the tensile and fatigue strength of SS 400 welded onto itself by $CO_2$ gas was higher than that of SS 400 welded onto STS 304.
감마선 조사법을 이용한 전기방사 나노/마이크로섬유 지지체의 표면 기능화
임종영,신영민,최종배,정진오,권희정,정성인,박종석,임윤묵 한국방사선산업학회 2013 방사선산업학회지 Vol.7 No.1
In tissue engineering application, a fibrous structure of scaffolds has been issued as analternative system to regulate cell survival and tissue regeneration, and electrospinning techniquehas been popularly used to generate fibrous meshes or sheets mimicking the structure of nativeextracellular matrix (ECM). However, recent strategy in the scaffold development is expanded toprovide the structural property as well as a biological property of native ECM, a variety of surfacemodification techniques have been used to introduce biological property. In this study, we developedbiomimetic poly(L-lactide-co-ε-caprolactone) (PLCL) nano- and micro-fibrous scaffolds as aunique platform with structural and biological properties with native ECM using electrospinningmethod and gamma-ray irradiation. Surface morphology of the scaffolds was observed by scanningelectron microscopy, and alteration of surface property was evaluated with toluidine blue O staining,water contact angle measurement and ATR-FTIR analysis.