A356 alüminyum alaşımının dökümünde katılaşma zamanı ve Nb ilavesinin mikroyapıya etkisinin incelenmesi

Year 2024, , 479 - 492, 15.06.2024

Önder Yalçın Mehmet Tokatlı , Ahmet Tigli , Murat Çolak

https://doi.org/10.17714/gumusfenbil.1336800

Abstract

Alüminyum alaşımları hafiflik, korozyon direnci, elektrik ve ısı iletkenliğinin yüksek olması yüksek dayanım, sünek olması gibi özelliklerinde dolayı oldukça önemli bir mühendislik malzemesidir. Bu sebeple; otomotiv, havacılık, savunma, uzay endüstrisi, makine imalat, gıda endüstrisi gibi birçok alanda yaygınca kullanım bulmaktadır. Özellikle otomotiv sanayi ve yüksek teknoloji gereksinimi olan birçok sektörde kullanımı artmakla birlikte kalite gereksinimleri de artmaktadır. Alüminyum döküm alaşımlarından kalite beklentisindeki artışa bağlı olarak farklı alaşım elementi ilaveleri ile dökümler yapılması ve üretimde yeni teknoloji kullanımları üzerinde çalışmalar devam etmektedir. Bu çalışmada A356 alüminyum döküm alaşımına %0.03, %0.06 ve %0.1 Niyobyum ilavesinin değişen kesitler içeren kokil kalıba dökümünde mikroyapı üzerindeki etkileri incelenecektir. Çalışmada ergitme, sıvı metal temizleme, kokil kalıba döküm, metalografik numune hazırlama, mikroyapı inceleme ve imaj analiz teknikleri kullanılmıştır. Sonuçlar incelediğinde katılaşma zamanına ve Nb ilave miktarına bağlı olarak döküm mikro yapılarında değişimler olduğu gözlenmiştir.

Keywords

A356 alüminyum döküm, Katılaşma zamanı, Mikroyapı, Nb ilavesi

Investigation of the effect of solidification time and Nb addition on the microstructure of A356 aluminum alloy castings

Abstract

Aluminum alloys are very important engineering materials due to their lightness, corrosion resistance, high electrical and thermal conductivity, high strength, and ductility. Therefore; It is widely used in many areas such as automotive, aviation, defense, space industry, machinery manufacturing, and food industry. The demand for high-quality aluminum products is also growing as their applications increase. This study aims to explore the influence of adding 0.03%, 0.06%, and 0.1% niobium to the A356 aluminum casting alloy on the resulting microstructure. The investigation focused on permanent step mold casting with different cross-sectional profiles. In the study, melting, liquid metal cleaning (lance degassing), permanent mold casting, metallographic sample preparation, microstructure examination, and image analysis techniques were used. It was observed that SDAS and SDAL of A356 increased with decreasing cooling rate. With the addition of 0.1% Nb, the dimensions of SDAS demonstrated a reduction when contrasted with the as-received A356 castings.

Keywords

A356 aluminum casting, Solidification time, Microstructure, Nb addition

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