GERİ DÖNÜŞTÜRÜLMÜŞ VE TİCARİ OLARAK TEMİN EDİLEN TM TİTANYUM ALAŞIMLARININ DARBE DAYANIMININ İNCELENMESİ

Titanyum alaşımları yüksek kütle – dayanım oranı gibi özellikleri sayesinde, biyomedikal, askeri, spor ve havacılık gibi birçok endüstriyel alanda kullanılmaktadır. Birçok endüstriyel alanda tercih edilmesine rağmen, yüksek maliyeti ve düşük geri dönüşüm oranı titanyum alaşımı malzemelerin kullanım alanlarını kısıtlamaktadır. Bu çalışma kapsamında partikül boyut dağılımının, ticari ve geri dönüştürülmüş toz metal Ti-6Al-4V alaşımlarının darbe dayanımları üzerindeki etkileri araştırılmaya çalışılmıştır. Bu kapsamda -40 µm toz partikül boyutundaki TM numunelere Charpy darbe testi uygulanmış ve numunelerin mikroyapıları incelenmiştir. Sonuçlar -40 µm toz partikül boyutundaki numuneler için ticari toz ile üretilenlerin daha yüksek dayanım değerlerine ulaştığı göstermektedir.

Anahtar Kelimeler:

Ti-6Al-4V, Sinterleme, Geri dönüşüm, Darbe dayanımı, Sıkıştırma

COMPARISON OF IMPACT PROPERTIES OF RECYCLED AND COMMERCIALLY AVAILABLE PM TITAMIUM ALLOYS

Titanium alloys are used in many specific applicants such as biomedical, military, sporting goods and aerospace industry due to their high strength properties and low aspect ratio. Even though their outstanding properties, titanium alloys have low utilization rate and relatively low recycling ratio during manufacturing of Titanium parts. In order to determine its mechanical and impact properties for low-cost Ti-based alloy applications, powder size distribution and compacting pressure strongly affect the microstructural properties of the sintered Ti-6Al-4V alloy. This paper presents how the narrow particle size distribution affect the impact properties of both recycled and commercially available Ti-6Al-4V alloys. Below 40µm particle size distribution range of Ti-6Al-4V alloys were conducted on 3-point bending, Charpy impact test and microstructural evaluation. Results indicate that -40µm size distributed and recycled Ti-6Al-4V alloys show more brittle behaviour than commercial available alloys.

Keywords:

Ti-6Al-4V, Sintering, Recycled, Impact properties, Compaction.,

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