Abstract
A study of the abrasive fluidized bed (AFB) finishing process was conducted to quantify the obtainable improvement of the fatigue behaviour of Ti6Al4V parts produced by electron beam melting (EBM). Axial-symmetric EBM samples were rotated at high speed inside a fluidized bed of stainless-steel media. The effects of the treatment time and the rotational speed on morphological features and fatigue life of the EBM samples were investigated. Outcomes showed that the improvement in surface properties induced by the AFB finishing process determined an increase up to 50% in fatigue life and a shift of the S-N curve.
Highlights
The high mechanical performance, resistance to corrosion, biocompatibility and low density of titanium alloys make them a key material for the industry [1]
The sample rotational speed is influential on the effectiveness of finishing and fatigue life of samples
After the abrasive fluidized bed finishing process an increase in fatigue life up to 50% was observed
Summary
The high mechanical performance, resistance to corrosion, biocompatibility and low density of titanium alloys make them a key material for the industry [1]. Laser powder bed fusion (L-PBF) and electron beam melting (EBM) have emerged as the leading metal-based AM technologies for industrial production for a wide variety of metallic alloys, including titanium alloys [6, 7]. The raw material is selectively melted by the energy source, a laser in L-PBF or an electron beam in EBM. EBM and L-PBF processes are anyway not competing; rather they offer different advantages for different types of applications [8]. EBM and L-PBF parts of identical material are characterized by significantly different microstructures and mechanical properties, and the surface topology and quality are distinctive [9, 10]. Finer geometrical details and smoother surfaces are obtained by L-PBF, whereas higher productivity, lower oxygen contamination and minimal
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