Elektron Işınıyla Ergitme Yöntemiyle Üretilen Ti6Al4V Parçalarının Mekanik Özellikleri Üzerinde İnşa Yönünün Etkisi

Öz

Bu çalışmanın amacı Ti6Al4V alaşım tozları kullanarak elektron ışınıyla ergitme yöntemiyle üretilen parçaların mekanik özellikleri üzerinde inşa yönünün etkisini araştırmaktır. Üç eksende (x, y ve z) numuneler üretilmiş ve yüzey pürüzlülüğünün mekanik özellikler üzerindeki etkisini görebilmek için her bir yöndeki bir numune tornalanmıştır. ASTM E8 standardına göre her bir yönde yapılan çekme testi sonuçlarına göre, z yönünde üretilen numunelerin akma ve çekme dayanımları, x ve y yönlerinde üretilenlere göre daha yüksek çıkmıştır. Her bir yönde üretilen numunelerin akma ve çekme dayanımları, dövme ya da döküm Ti6Al4V parçaların aynı özelliklerinden yüksek çıkmıştır. Numuneler sünek-kırılgan karışımı bir yapı göstermiş, mikroyapı genel olarak Widmanstatten / sepet örgüsü şeklinde çıkmış ve β taneciklerinin içerisinde α ince tanecikli mikroyapı görülmüştür.

Anahtar Kelimeler

• Elektron ışınıyla ergitme
• inşa yönü
• titanyum
• eklemeli imalat

Effect of Building Direction on Mechanical Properties of Ti6al4v Parts Produced by Electron Beam Melting

Öz

The aim of this study is to investigate the effect of building direction on mechanical properties of the parts fabricated using Ti6Al4V alloy powders by electron beam melting method. Three specimens in three different directions (X, Y and Z) were produced and to see the effect of surface roughness on mechanical properties, one of the samples in each direction were machined by lathe. The results of tension tests on samples produced in three directions according to ASTM E8 standard revealed that yield and tensile strength of the samples built in Z direction are higher than the related properties of the samples built in X and Y directions. Yield and tensile strength of the samples built in each of the direction comes out to be higher than the same properties of the wrought or cast Ti6Al4V parts. Specimens displayed a mixed ductile-brittle fracture characteristic and the microstructure is mainly Widmanstatten / basket weave and α lamellar microstructure was observed inside the prior β grains.

Anahtar Kelimeler

• Electron Beam
• Titanium
• Building Direction
• Additive Manufacturing

Kaynakça

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