Al 5083O합금의 마찰교반용접부의 조직과 특성평가 (Mechanical Characteristics and Macro-and Micro-structures on Friction Stir Welded Joints with 5083O Al Alloys)

서지정보

· 발행기관 : 한국마린엔지니어링학회
· 수록지 정보 : 한국마린엔지니어링학회지 / 33권 / 1호 / 104 ~ 111페이지
· 저자명 : 장석기, 박종식

초록

This paper shows the behaviors of macro- and micro-structures and mechanical properties for specimen‘s welding region welded by FSW. according to welding conditions with 5mm thickness aluminum 5083O alloy plate. It apparently results in defect-free weld zone in case traverse speed was changed to 32 mm/min under conditions of anti-clockwise direction and tool rotation speed such as 800 and 1250 rpm with tool's pin diameter of 5 φmm and shoulder diameter of 20 φmm, pin length of 4.5 mm and tilting angle of . The ultimate stress of σ=331 MPa and the yield point of 147 MPa are obtained at the condition of the travel speed of 32 mm/min with the tool rotation speed of 1250 rpm. There is neither voids nor cracks on bended surface of after bending test. The improvement of toughness after impact test was found. The lower rotating and traverse speed became, the higher were yield point, maximum stress and elongation (%) with the stresses and the elongation (%) versus the traverse speed diagram. Vickers hardness for cross section of welding zone were also presented. The typical macro-structures such as dynamically recrystallized zone, thermo-mechanically affected zone and heat affected zone and the micro-structures of the transverse cross-section were also showed. However, the author found out that the region of 6mm far away from shoulder circumference was affected by friction heat comprehensively, that is, hardness softened and that part of micro-structures were re-solid-solution or recrystallized. the author also knew that there is no mechanically deformation on heat affected zone but there are the flow of plastic deformation of direction on thermo-mechanically affected zone and the segregation of Al-Mg on nugget. The solid solution wt (%) of parent material as compared against of friction stir welded zone was comprehensively changed.

영어초록

This paper shows the behaviors of macro- and micro-structures and mechanical properties for specimen‘s welding region welded by FSW. according to welding conditions with 5mm thickness aluminum 5083O alloy plate. It apparently results in defect-free weld zone in case traverse speed was changed to 32 mm/min under conditions of anti-clockwise direction and tool rotation speed such as 800 and 1250 rpm with tool's pin diameter of 5 φmm and shoulder diameter of 20 φmm, pin length of 4.5 mm and tilting angle of . The ultimate stress of σ=331 MPa and the yield point of 147 MPa are obtained at the condition of the travel speed of 32 mm/min with the tool rotation speed of 1250 rpm. There is neither voids nor cracks on bended surface of after bending test. The improvement of toughness after impact test was found. The lower rotating and traverse speed became, the higher were yield point, maximum stress and elongation (%) with the stresses and the elongation (%) versus the traverse speed diagram. Vickers hardness for cross section of welding zone were also presented. The typical macro-structures such as dynamically recrystallized zone, thermo-mechanically affected zone and heat affected zone and the micro-structures of the transverse cross-section were also showed. However, the author found out that the region of 6mm far away from shoulder circumference was affected by friction heat comprehensively, that is, hardness softened and that part of micro-structures were re-solid-solution or recrystallized. the author also knew that there is no mechanically deformation on heat affected zone but there are the flow of plastic deformation of direction on thermo-mechanically affected zone and the segregation of Al-Mg on nugget. The solid solution wt (%) of parent material as compared against of friction stir welded zone was comprehensively changed.

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