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19 results on '"Gürsoy, Özen"'

9. Characterisation of Aluminum Alloys by Octopus Fluidity Test.

Author

ERZİ, Eray, YÜKSEL, Çağlar, GÜRSOY, Özen, ÇOLAK, Murat, and DISPINAR, Derya

Subjects
TRANSPORTATION industry, METAL microstructure, CORROSION resistance, STRENGTH of materials
Abstract

Copyright of Journal of Polytechnic is the property of Journal of Polytechnic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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18. Al-Si alaşımlarında Ti ilavesinin sıvı metal temizliğine etkisi

Author

Gürsoy, Özen, Dışpınar, Derya, and Metalurji ve Malzeme Mühendisliği Anabilim Dalı

Subjects
Metalurji Mühendisliği, Metallurgical Engineering, Engineering Sciences, Mühendislik Bilimleri
Abstract

Al-Si alaşımlarında, temelde mekanik özellikleri arttırmak olmak üzere, akışkanlık, beslenebilirlik, korozyon direnci özelliklerini iyileştirmek için tane incelticiler ve modifikatörler döküm uygulamalarında sıklıkla kullanılmaktadır. Ti içeren Al-5Ti-1B master alaşımı, en yaygın kullanılan tane inceltici master alaşımıdır. Al-5Ti-1B ilavesi ile incelen taneler sayesinde mekanik özelliklerin arttığı düşünülmektedir. Tane incelticilerin yanı sıra, kalitesi yüksek (bifilm indeksi düşük) bir sıvı ile çalışmanın da mekanik özellikleri olumlu etkilediği artık bilinen bir gerçektir. Bugüne kadar yapılan çalışmalarda Ti içeren master alaşımlarının sıvı metal kalitesine etkisi göz ardı edilmiştir. Bu çalışmada Al-5Ti-1B 'nin sıvı metal kalitesine ve mekanik özelliklere etkisi kum ve kokil kalıp kullanılarak belirlenmiştir. Mikroyapı ile mekanik özellikler arasında bir ilişki yakalanmaya çalışılmıştır. Literatür verilerinin aksine, yavaş soğuma ve kaba taneli dendritik yapıda daha yüksek mekanik özellikler elde edilmiştir. Grain refiners and modifiers are widely used in casting applications of Al-Si alloys to improve mechanical properties, fluidity, feedability and corrosion resistance. The Ti-containing Al-5Ti-1B master alloy is the most commonly used grain refiner master alloy. It is considered that the mechanical properties are increased by decreasing of grain size via the addition of Al-5Ti-1B. Besides the grain refiners, it is well known that working with a high quality (low bifilm index) melt will also provide enhanced mechanical properties. Up to now, the effects of Ti-containing master alloys on melt quality have not been observed. In this study, the effect of Al-5Ti-1B master alloy on melt quality and mechanical properties was determined using die and sand mold. The relationship between microstructure and mechanical properties were investigated. In contrast to the literature survey, it was found that high mechanical properties were obtained in coarse dendritic structure. 70

Published
2017

19. Determination of Acceptable Quality Limit for Casting of A356 Aluminium Alloy: Supplier's Quality Index (SQI).

Author

Erzi, Eray, Gürsoy, Özen, Yüksel, Çağlar, Colak, Murat, and Dispinar, Derya

Subjects
DIE-casting, ALUMINUM, SUPPLIERS
Abstract

Aluminium and its alloys have been widely used in the automotive industry for some time and A356 is one of the most popular aluminium alloys today in the sector. It contains approximately 7 wt.% Si and 0.3 wt.% Mg. Due to the defects that may be present in the cast parts, expected mechanical properties may not be reached and this alloy may perform in service under its potential. In a low pressure die casting, several precautions have to be taken in order to produce high quality and defect-free castings. Temperature of casting and the schemical composition of the melt is recorded continuously. Die temperature, pressure levels and their durations are optimized; degassing and fluxing operations are performed. Yet, regardless of the precautions, there could still be rejected parts. It is becoming clear that a good quality raw material is one of the most underrated points of the industry and that the starting material has a great effect on the final product and it should be taken in to account more seriously. Therefore, regarding the first rule of Campbell's 10 Rules of Casting, in this study, the quality of the starting material of supply chains for a wheel manufacturer was investigated. Chemical compositions were compared, fluidity tests, mechanical tests and bifilm indexes of these various sources and ingots were measured and a final quality index was proposed to create a reference for the quantification of quality of supplier's ingots. This new index was compared with the rejection rates. [ABSTRACT FROM AUTHOR]

Published
2019
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