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RISS 인기검색어
- 검색키워드
- 저자 : 이세경(Se-Gyoung Lee) (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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이세경,민병훈,최수현,심도기,민택기,Lee, Se-Gyoung,Min, Byung-Hoon,Choi, Su-Hyun,Shim, Do-Ki,Min, Taeg-Ki 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.6
The present study examined the mechanical properties of the friction welding of shaft made of SKH51 and SM45C, of which the diameter is 12mm. Friction welding was done at welding conditions of 2,000rpm, friction pressure of 104MPa, upset pressure of 134MPa, friction time of 0.5sec to 2.5sec by increasing 0.5sec, upset time of 2 seconds. Under these conditions, a tensile test, a bending test, a shear test, a hardness test and a microstructure of weld interface were studied. When the friction time was 1.0 second under the conditions, the maximum tensile strength of the friction weld observed to be 963MPa, which is 89% the tensile strength of SKH51 base metal and 101% of the tensile strength of SM45C base metal. When the friction time was 1.0 seconds under the conditions, the maximum bending strength of the friction weld happened to be 1,647MPa, which is 78% the bending strength of SKH51 base metal(2,113MPa) and 87% of the bending strength of SM45C base metal(1,889MPa). When the friction time was 1.0 seconds under conditions, the maximum shear strength of the friction weld was observed to be 755MPa, which is 92% the shear strength of SKH51 base metal and 122% of the shear strength of SM45C base metal. According to the hardness test, the hardness distribution of the weld interface varied from Hv282 to Hv327. HAZ was formed from the weld interface to 1.2mm of SKH51 and 1.6mm of SM45C. Upon examination it was found that the microstructure became finer along with increase of friction revolution radius.
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SCNCrM-2B와 SM25C의 마찰용접특성에 관한 연구
이세경(Se-Gyoung Lee),심영만(Young-Man Sim),민택기(Taeg-Ki Min) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.4
This study deals with the friction welding of SM25C and SCNCrM-2B; The friction time was variable conditions under the conditions of spindle revolution 2,000rpm, friction pressure of 100㎫, upset pressure of 150㎫, and upset time of 4.0 seconds. Under these conditions, the microstructure of weld interface, tensile fracture surface and mechanical tests were studied, and so the results were as follows. 1. When the friction time is 2.0 seconds, the tensile strength of friction welds was 874㎫, which is around as much as 117% of the tensile strength of base metal(SM25C), the bending strength of friction welds was 1,354㎫, which is around as much as 108.9% of the bending strength of base metal(SM25C). 2. At the same condition, the maximum vickers hardness was Hv443 at SCNCrM-2B nearby weld interface, which is higher Hv20 than condition of the friction time 0.5 seconds. 3. The results of microstructure analysis show that the structures of two base materials have fractionated and rearranged along a column due to heating and axial force during friction, which has affected in raising hardness and tensile strength.
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SM20C 摩擦熔接部의 노치 깊이에 따른 機械的 性質 硏究
이세경(Se-Gyoung Lee),정준모(Jun-Mo Chung),박천봉(Chun-Bong Park),민택기(Taeg-Ki Min) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.1
The present study examined the mechanical properties of the friction welding zone of solid and hollow shafts made with SM20C according to the depth of the notch. Friction welding was conducted at welding conditions of 2,000 rpm, friction pressure of 60㎫, friction time of 1.4 seconds, upset pressure of 100㎫, and upset time of 2.0 seconds. In the tensile strength test, the tensile strength decreased as the depth of the notch increased. Tensile strength was moderately high when the depth of the notch was 2mm. The tensile strength of the welding zone increased as the friction revolution radius increased, because the latter led to the generation of adequate friction heat. According to the hardness test, hardness likewise increased as the friction revolution radius increased. In the bending test, the bend strength of the solid shaft decreased when the depth of the notch was 0-2㎜ but increased when the latter was 3-5㎜. With regard to the hollow shaft, the bend strength drastically decreased when the depth of the notch was 3-4㎜. Upon examination it was found that the microstructure became finer when the friction revolution radius increased.
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A2024-T6/A6061-T6의摩擦熔接 特性에 관한 硏究
이세경(Se-Gyoung Lee),민택기(Taeg-Ki Min) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.1
This study deals with the friction welding of A2024-T6 to A6061-T6; The friction time was variable conditions under the conditions of spindle revolution of 2000rpm, friction pressure of 50㎫, upset pressure of 100㎫, and upset time of 5.0seconds. Under these conditions, the microstructure of weld interface, tensile fracture surface and mechanical tests were studied, of friction weld, and so the results were as follows. 1. When the friction time was 1.5seconds under the conditions, the maximum tensile strength of the friction weld happened to be 292㎫, which is 94.2% of the base material’s tensile strength(310㎫). At the same condition, the maximum shear strength was 212MPa, which is equivalent to 103% of the base material’s shear strength (205㎫). 2. At the same condition, the maximum vickers hardness was Hv146 at A2024-T6 nearby weld interface, which is higher Hv3 than condition of the friction time 0.5seconds, and the maximum vickers hardness was Hv120 from weld interface of A6061-T6, which is higher Hv28 then base material’s. 3. The results of microstructure analysis show that the structures of two base materials have fractionized and rearranged along a column due to heating and axial force during friction, which has affected in raising hardness and tensile strength.
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SM20C摩擦鎔接시 鎔接部 가공에 따른機械的 性質 硏究
이세경,박천봉,민택기 충남대학교 공업교육연구소 2005 論文集 Vol.27 No.1
This study examined mechanical properties according to the change of outer circumference in the friction welding of SM20C, which is one of carbon steel for machine structures used in steel pipes, steel rods, steel plates, bolts, rivets, etc., and SM20C stock with 10 hollow at the center. Welding conditions were fixed at RPM of 2,000, friction pressure of 60㎫, friction time of 1.4 seconds, upset pressure of100㎫ and upset time of 2.0 seconds. The obtained of this study are as follows. According to the tensile strength test, the maximum tensile strength was 585㎫ when the change of outer circumference was 1mm and it corresponds to 94% of 624㎫, the tensile strength of the base material. The result of measuring hardness, hardness appeared to increase at 5mm and then decrease for welding interface, and it was maximum 250HV at D=5mm of the solid shaft. High hardness was observed around 0.5mm of vertical distance from the welding section and relatively low hardness was observed around 2mm. The result of a bending test, the maximum bending strength was 7.701㎫ at L = 5mm in the solid shaft, which is 130% of the bending strength of the base material. The result of examining microstructure, the microstructure grew finer with the change of outer circumference against the welding surface. Namely, as it was closer to the center in the solid shaft, but the microstructure grew finer and then coarser in the hollow shaft.
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