Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Heat Treatment Conditions on Formability and Property of Warm Hydroformed Parts for Al 6061 Extruded Tube

Al6061압출재를 이용한 온간액압성형품의 성형성 및 물성에 미치는 열처리조건의 영향

  • Yi, Hyae-Kyung (School of Mechanical Engineering, Pusan National University) ;
  • Kwon, Seung-O (School of Mechanical Engineering, Pusan National University) ;
  • Jang, Jeong-Hwan (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Young-Seon (Materials Processing Research Center, Korea Institute of Machinery and Materials) ;
  • Moon, Young-Hoon (School of Mechanical Engineering, Pusan National University)
  • Received : 2007.06.03
  • Accepted : 2007.06.26
  • Published : 2007.07.30
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Abstract

Effect of heat treatment conditions on formability and property of warm hydroformed parts for Al 6061 extruded tubes was investigated in this study. For the investigation, as-extruded, fully annealed and T6-treated Al 6061 seamless tubes were prepared. To evaluate the warm hydroformability, uni-axial tensile test and free bulge test were performed at various pre- and post-heat treatment conditions. And the tensile test specimens were obtained from hexagonal prototype hydroformed parts at $250^{\circ}C$. As a result, hydroformability of fully annealed tube is 25% higher than that of extruded tube. The tensile strength and strain of hydroformed part reach to 330 MPa and 12%, respectively, when the part was T6 treated after warm hydroforming. However, the hydroformability of T6 pre-treated tube is relatively low due to the decreased elongation, 8%.

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References

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