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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 587-592 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Extruded aluminum alloys, which are highly versatile, have relatively modest prototypingcost, good strength and corrosion resistance. Because there is no weld seam, the circumferentialmechanical properties may be uniform and advantageous for hydroforming. However, surface defectssuch as die lines and pick-up can be generated during the extrusion especially due to imperfections onthe die surface. In this study, the extent of the crack propagation caused by die lines is evaluatedaccording to the deformed shape of the tube in hydroforming process. And when forming a extrudedaluminum tube, the deformed surface of the tube frequently becomes rougher with increasing plasticstrain. This is well known as orange peel phenomenon and it has a significantly effect not only on thesurface quality of a final product but also on the forming limit. To evaluate the effects of the orangepeel on the hydroformability, the inter-stage polishing has been performed. Through the several testsincluding hydroforming test, the effect of surface defects on the hydroformabilities are well defined
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4544-4549 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Continuous cooling and isothermal dilatometry was performed for a binary Fe-0.3C alloyand a ternary Fe-0.3C-1.0Mn alloy at slow (〈 0.1 oC/s) cooling rates and isothermally at temperaturesbelow the equilibrium eutectoid reaction temperature but above the bainite start temperature (625 to715 oC). Some of the test conditions produced an unusual morphology in which fine scale‘sub-grains’ are decorated with carbide, with additional discrete carbide particles inside the‘sub-grains’. A detailed investigation into the network carbide formation indicates formation duringaustenite decomposition, as opposed to a post lamellar transformation coarsening or spheroidizationreaction, but only for select temperatures, and apparently only during isothermal conditions
    Type of Medium: Electronic Resource
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