Browsing by Author "Yagci T."

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    Investigation and characterization of inclusions in aluminium cast alloys for automotive industry
    (Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association, 2018) Ozaydin O.; Yagci T.; Kaya A.; Culha O.; Armakan E.
    [No abstract available]
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    Investigation and characterisation of inclusions in aluminium cast alloys for the automotive industry
    (Institute of Cast Metals Engineers, 2019) Ozaydin O.; Kaya A.; Armakan E.; Yagci T.; Culha O.
    'Lightweight materials' are widely used in the automotive industry. Not only the demand for fuel efficiency, but also regulations mandating lower emission values lead automotive manufacturers to increase their use of lightweight materials. Considering the low density, better mechanical properties, easier machinability, corrosion resistance and recyclability, Al-Si based alloys are widely used in automotive components such as wheels. Beside these advantages, disadvantages such as impurities, porosity and grain size play a vital role in terms of mechanical properties and surface quality of aluminium alloys. In this study, inclusions were investigated. The SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy) analysis and elemental mapping methods are preferred in the investigation. All critical areas on the samples were defined and analysed by SEM & EDS methods. © 2019 Institute of Cast Metals Engineers. All rights reserved.
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    Effects Of Air-Cooling-Hole Geometries On A Low-Pressure Die-Casting Process; [Vpliv Geometrije Kanalov Za Zračno Hlajenje Na Proces Nizko Tlačnega Litja]
    (Institute of Metals Technology, 2021) Pehlivanoglu U.; Yagci T.; Culha O.
    A significant precondition for the production of high-quality castings is keeping an optimum temperature of the respective parts of the die cavity surface. This temperature depends on the temperature of the material, the quantity of metal, the method of cooling the casting die, the thermal conductivity of the die material, and the time during which the casting remains in the die. In addition, the cooling characteristics of alloy steel dies, used in the production of aluminum-alloy wheels with the low pressure die casting (LPDC) method, have critical effects on the mechanical and metallurgical properties of the product. Ducted air coolers are widely used for the cooling of these alloy steel dies. However, the geometrical designs of the air-cooling holes are limited. In this study, we define the effects of the geometry of the cooling holes on the cooling power of the die, the efficiency of the air consumption with the Full Factorial Experimental Design method and to determine the optimum values for LPDC. Pilot production has been carried out on an industrial scale to verify the data obtained by experimental design. The experimental and real data were compared based on the values of the yield strength and the secondary dendrite arm spacing in the microstructure. © 2021, Materiali in Tehnologije. All Rights Reserved
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    Effect of chip amount on microstructural and mechanical properties of a356 aluminum casting alloy
    (Polska Akademia Nauk, 2021) Kaya A.Y.; Ozaydin O.; Yagci T.; Korkmaz A.; Armakan E.; Culha O.
    Aluminum casting alloys are widely used in especially automotive, aerospace, and other industrial applications due to providing desired mechanical characteristics and their high specific strength properties. Along with the increase of application areas, the importance of recycling in aluminum alloys is also increasing. The amount of energy required for producing primary ingots is about ten times the amount of energy required for the production of recycled ingots. The large energy savings achieved by using the recycled ingots results in a significant reduction in the amount of greenhouse gas released to nature compared to primary ingot production. Production can be made by adding a certain amount of recycled ingot to the primary ingot so that the desired mechanical properties remain within the boundary conditions. In this study, by using the A356 alloy and chips with five different quantities (100% primary ingots, 30% recycled ingots + 70% primary ingots, 50% recycled ingots + 50% primary ingots, 70% recycled ingots + 30% primary ingots, 100% recycled ingots), the effect on mechanical properties has been examined and the maximum amount of chips that can be used in production has been determined. T6 heat treatment was applied to the samples obtained by the gravity casting method and the mechanical properties were compared depending on the amount of chips. Besides, microstructural examinations were carried out with optical microscopy techniques. As a result, it has been observed that while producing from primary ingots, adding 30% recycled ingot to the alloy composition improves the mechanical properties of the alloy such as yield strength and tensile strength to a certain extent. However, generally a downward pattern was observed with increasing recycled ingot amount. © 2021 Polish Academy of Sciences. All rights reserved.