Alüminyum alaşımlarının dökümünde niyobyum alaşım elementi ilavesinin etkisinin incelenmesi
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bayburt Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Alüminyum ve alaşımları, korozyon direnci, döküm dayanımları, elektrik ve ısı iletkenliğinin yüksek olması ve sünek olması gibi özelliklerinden dolayı oldukça önemli bir mühendislik malzemesidir. Bu sebepten dolayı savunma sanayi, endüstriyel üretimler ve makine sanayisinde kullanımı oldukça yaygındır. Özellikle otomotiv sanayi ve yüksek teknoloji gereksinimi olan birçok sektörde kullanımı artmakla birlikte kalite gereksinimleri de giderek artmaktadır. Alüminyum döküm alaşımlarından kalite beklentisindeki artışa bağlı olarak farklı alaşım elementi ilaveleri ile dökümler yapılmaktadır. Bu kapsamda bu tez çalışmasında A356 alüminyum döküm alaşımına % 0,03, % 0,05 ve % 0,1 Niyobyum (Nb) ilavesinin döküm özelliklerine etkisi deneysel teknikler ile araştırılmıştır. Döküm özelliklerinin incelenmesi kapsamında: akıcılık, beslenebilirlik, mikroyapı özellikleri ve mekanik özelliklerinde Nb ilavesinin etkisi değerlendirilmiştir. Döküm deneylerinde kokil kalıplama metodu kullanılmıştır. İlk olarak ilavesiz A356 alüminyum döküm alaşımının dökümü yapılmıştır. Daha sonra AlNbB3,5/0,5 olan Nb elementi ilavesi ile A356 alüminyum döküm alaşımına %0,03, %0,06 ve %0,1 gibi değişen oranlarda Nb ilave edilerek dökümleri yapılmıştır. Sıvı metal 720 °C'deki sıvı metalin vakum altında katılaştırma arşimet test numuneleri alınmıştır. Kokil kalıplar ise, K-mold, ördek ayağı, akıcılık, çekme çubuğu, spiral ve basamak kokil kalıplarına sırasıyla dökümler gerçekleştirilmiştir. Sonuç olarak, döküm çalışmaları uygulandıktan sonra arşimet numunesi testinde gözeneklerin azaldığı, çekme testinde numunenin mukavemetinin arttığı, K-mold test numunesinde inklüzyonların azaldığı, akıcılığın giderek azaldığı, ördek ayağı dökümünde çekinti miktarının azaldığı ve basamak test numunesinden içyapı incelemesinde inklüzyonların ve gözeneklerin azaldığı görülmüştür.
Aluminum and its alloys are very important engineering materials due to their properties such as corrosion resistance, casting strength, high electrical and thermal conductivity and ductility. For this reason, its use is quite common in the defense industry, industrial production and machinery industry. While its use is increasing, especially in the automotive industry and many sectors requiring high technology, quality requirements are also increasing. Depending on the increase in quality expectations from aluminum casting alloys, castings are made with the addition of different alloying elements. In this context, in this thesis study, the effect of 0,03 %, 0,06 % and 0.1 % Niobium (Nb) addition on the casting properties of A356 aluminum casting alloy was investigated with experimental techniques. Within the scope of examining the casting properties, the effect of Nb addition on flowability, feedability, microstructural properties and mechanical properties was evaluated. The permanent molding method was used in the casting experiments. First, the A356 aluminum casting alloy without additions was cast. Then, with the addition of the Nb element, which is AlNbB3,5/0,5 Nb was added to the A356 aluminum casting alloy in varying amounts such as 0,03 %, 0,06 % and 0,1 %, and castings were made. Liquid metal Archimedes test samples were taken for the solidification of liquid metal at 720°C under vacuum. As for colic moulds, castings were made in K-mold, duck foot, flow, draw rod, spiral and step permanent molds respectively. As a result, after the casting studies were applied, it was observed that the pores decreased in the Archimedes sample test, the strength of the sample increased in the tensile test, the inclusions decreased in the K-mold test sample, the fluidity gradually decreased, the amount of shrinkage decreased in the duck foot casting, and the inclusions and pores decreased in the internal structure examination of the step test sample.
Aluminum and its alloys are very important engineering materials due to their properties such as corrosion resistance, casting strength, high electrical and thermal conductivity and ductility. For this reason, its use is quite common in the defense industry, industrial production and machinery industry. While its use is increasing, especially in the automotive industry and many sectors requiring high technology, quality requirements are also increasing. Depending on the increase in quality expectations from aluminum casting alloys, castings are made with the addition of different alloying elements. In this context, in this thesis study, the effect of 0,03 %, 0,06 % and 0.1 % Niobium (Nb) addition on the casting properties of A356 aluminum casting alloy was investigated with experimental techniques. Within the scope of examining the casting properties, the effect of Nb addition on flowability, feedability, microstructural properties and mechanical properties was evaluated. The permanent molding method was used in the casting experiments. First, the A356 aluminum casting alloy without additions was cast. Then, with the addition of the Nb element, which is AlNbB3,5/0,5 Nb was added to the A356 aluminum casting alloy in varying amounts such as 0,03 %, 0,06 % and 0,1 %, and castings were made. Liquid metal Archimedes test samples were taken for the solidification of liquid metal at 720°C under vacuum. As for colic moulds, castings were made in K-mold, duck foot, flow, draw rod, spiral and step permanent molds respectively. As a result, after the casting studies were applied, it was observed that the pores decreased in the Archimedes sample test, the strength of the sample increased in the tensile test, the inclusions decreased in the K-mold test sample, the fluidity gradually decreased, the amount of shrinkage decreased in the duck foot casting, and the inclusions and pores decreased in the internal structure examination of the step test sample.
Açıklama
Lisansüstü Eğitim Enstitüsü, Makine Mühendisliği Ana Bilim Dalı, Makine Mühendisliği Bilim Dalı
Anahtar Kelimeler
Makine Mühendisliği, Mechanical Engineering
