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Size Effects of Recovered Ti-6Al-4V Alloy Scrap by Conventional P/M Techniques



Author(s)

Mustafa Ustundag, Mehmet Fahri Sarac and Remzi Varol

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DOI:10.17265/2161-6221/2018.5-6.003

Department of Mechanical Engineering, Suleyman Demirel University, Isparta, 32260, Turkey

The main challenges for Titanium alloys are low utilization rate and relatively low recycling ratio. For recycled Ti-6Al-4V alloy industry scrap, sieve analysis and compacting pressures are important parameters that determine its mechanical properties for low-cost Ti-based alloy applications. Titanium alloy scraps milled at various machining speeds ranging from 800 rpm to 1,100 rpm at constant time. Afterwards, sieve analysis classifies powder distribution for four categories such as -40, 40-105, 105-150, 150-212 μm. Different particle size distribution range of Ti-6Al-4V alloy industry scrap is compacted at various pressure (from 600 MPa to 1,500 MPa) and then sintered for final product. Three-point bending and microstructural evaluation were conducted on both commercially available and recycled Ti-6Al-4V alloy industry scrap to evaluate which particle size distribution gives better mechanical performance, uniform distribution and high apparent density. Results indicate that scrap particle, which has less than -40 μm size distribution, compacted at 1,050 MPa and sintered at 1,200 °C under high vacuum (10^-6 mbar) gives 99.5% apparent density while green density of Ti-6Al-4V alloy industry scrap was about to 80%.

Ti-6Al-4V, scrap, size effect, compaction, sintering.