Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Evaluation of mechanical properties on friction stir lap jointed Al6061/HT590 alloys

겹치기 마찰교반접합 된 Al6061/HT590 합금의 기계적 특성 평가

  • Kim, Eun-Hye (Non-Ferrous and Components R&BD Gangwon Regional Division, Korea Institute of Industrial Technology) ;
  • Lee, Kwang-Jin (Convergence Components & Agricultural Machinery Application Group, Jeonbuk Regional Division, Korea Institute of Industrial Technology) ;
  • Song, Kuk-Hyun (Non-Ferrous and Components R&BD Gangwon Regional Division, Korea Institute of Industrial Technology)
  • 김은혜 (한국생산기술연구원 비철금속소재부품그룹) ;
  • 이광진 (한국생산기술연구원 융복합부품.농기계그룹) ;
  • 송국현 (한국생산기술연구원 비철금속소재부품그룹)
  • Received : 2015.04.14
  • Accepted : 2015.04.24
  • Published : 2015.04.30
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Abstract

This study was carried out to evaluate mechanical properties of the jointed Al6061/HT590 alloys by friction stir welding (FSW). FSW was conducted under the conditions with tool rotating speed of 500 RPM and traveling speed of 300 mm/min., where Ar gas was introduced to prevent the materials from corrosion during the welding process. Electron back-scattering diffraction (EBSD) was used to characterize microstructures such as grain size, misorientation angle and crystal orientation. Evolution of intermetallic compounds in Al6061 during the process were examined in terms of morphology, size and aspect ratio at three distinct zones Al base material, heat affected zone and stir zone, where transmission electron microscope (TEM) was used. It was revealed that FSW gave rise to refinement of grains as well as growth of intermetallic compounds in Al6061. The morphological changes of intermetallic compounds exerted an influence on mechanical properties, resulting in occurrence of fracture in the part of the base material instead of the jointed parts (heat affected zone and stir zone). This study systematically evaluated the microstructural evolutions during the FSW for joining Al6061 with HT590 and their effect on mechanical properties.

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References

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