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    Improvement of metallurgical properties of A356 aluminium alloy by AlCrFeSrTiBSi master alloy
    (Walter de Gruyter GmbH, 2023) Teker, T.; Yılmaz, Serdar Osman; Karakoca, Alper
    A new AlCrFeSrTiBSi master alloy was manufactured by in situ synthesis in Al melt, and compared with AlBSr master alloy. Microstructures of A356 alloy modified with AlCrFeSrTiBSi master alloy were investigated, and the structural details of the new cast A356 alloy were evaluated by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness and differential thermal analysis (DTA). AlBSr master alloy typically formed ?-Al and granular SrB6 phases in A356, and the samples inoculated with AlCrFeSrTiBSi master alloy consisted of additionally AlCrFeSi phase with irregular blocks. The addition of 0.1 wt%AlCrFeSrTiBSi alloy to the A356 alloy significantly refined and modified the grain structure together. The structure of eutectic Si converted from acicular form to fibrous. The size of ?-Al dendrites declined from ?1000 ?m to ?100 ?m. The strength values of the A356 alloy were developed by ?70% with the addition of 0.1 wt%AlCrFeSrTiBSi master alloy. © 2022 Walter de Gruyter GmbH, Berlin/Boston.
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    Joint performance of medium carbon steel-austenitic stainless steel double-sided TIG welds
    (Walter de Gruyter GmbH, 2023) Teker, T.; Aydın, S.; Yılmaz, Serdar Osman
    AISI 1040 and AISI 304 steel plates of 10 mm were joined without pretreatment by double-sided TIG arc welding (DSAW). Joints were manufactured by using welding currents of 420, 440, and 460 A. The microstructural variations in the interface of the weld samples were defined by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and microhardness analysis. V-notch impact and tensile tests were done to detect the weld strength of the weld samples. In DSAW welding of different steels, a full penetration joint was achieved without opening the weld edge. The current intensity had a major effect on the symmetrical and hourglass shape in welds. Welding at 460 (A) showed acceptable joint quality. Tensile and impact energy quantities of welded joints had significant ratios. Fractures in the weld metal of the samples were ductile mode. © 2022 Walter de Gruyter GmbH, Berlin/Boston.