Yazar "Ipekoglu, G." seçeneğine göre listele

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    Effects of use of higher strength interlayer and external cooling on properties of friction stir welded AA6061-T6 joints
    (Taylor & Francis Ltd, 2014) Cam, G.; Ipekoglu, G.; Serindag, H. Tarik
    Although sound AA6061-T6 joints can be produced by friction stir welding, a loss in strength takes place in the weld region. In this study, it was demonstrated that the strength of the nugget could be increased by the use of a higher strength interlayer during friction stir welding. This strength recovery cannot, however, be attainable in the heat affected zone. Although an external cooling was applied during welding in order to increase strength in the heat affected zone, it was not sufficient for achieving the required cooling condition for improved strength.
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    Investigation into the effect of temper condition on friction stir weldability of AA6061 Al-alloy plates
    (Redakcia Kovove Materialy, 2013) Ipekoglu, G.; Erim, S.; Kiral, B. Goren; Cam, G.
    Although Al-alloys have been widely applied in transportation industries in recent years owing to their low density and excellent formability properties, further advancement in welding of these alloys is a very critical issue for further increasing their use in practice. These alloys, which exhibit difficulties in fusion welding processes, particularly age-hardened grades, can be successfully joined by friction stir welding. In this study, AA6061 Al-alloy plates both in 0 and T6 temper conditions were joined by friction stir welding using four different sets of weld parameters. Microstructural and mechanical characterization of the joints produced was made by detailed optical microscopy investigations, extensive hardness measurements and tensile tests. The effect of temper condition on the joint performance was also determined in addition to the effect of weld parameters on the joint quality.
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    Investigation into the microstructure and mechanical properties of diffusion bonded TiAl alloys
    (Springer, 2006) Cam, G.; Ipekoglu, G.; Bohm, K. -H.; Kocak, M.
    TiAl alloys are potential candidates for replacing conventional Ti-alloys in gas turbine applications in the relatively lower temperature sections, owing to their low density and excellent high temperature properties. However, their intolerable ambient temperature brittleness hinders their use in such applications. Recently, TiAl alloys with some room temperature ductility were developed through alloy development programmes using special production routes such as powder metallurgy. However, the room temperature brittleness of these alloys could not be overcome. Sound joining of these alloys is a fundamental prerequisite for their successful integration into high temperature aerospace applications. It has been well demonstrated that diffusion bonding, a commonly used joining technology in conventional Ti-alloys, can successfully be used in joining of TiAl alloys both in as-cast or special-rolled conditions. In this study, diffusion bondability of a recently developed C containing TiAl alloy with a duplex microstructure using bonding parameters in the range of commercially available equipments was studied. Microstructural investigations in the joint area of the bonds were conducted to observe the presence of any weld defect. Additionally, the mechanical behaviour of the bonds was determined by shear testing to find out the optimum bonding parameters. Furthermore, the effect of post-bond heat treatment on the mechanical properties was investigated.