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Effect of Heat Treatment Conditions on Formability and Property of Warm Hydroformed Parts for Al 6061 Extruded Tube  

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)
Publication Information
Journal of the Korean Society for Heat Treatment / v.20, no.4, 2007 , pp. 181-186 More about this Journal
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%.
Keywords
Warm hydroforming; Al 6061; hydroformability; free bulge test; heat treatment;
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