Mechanical Surface Treatment of Titanium Alloy Ti6Al4V Manufactured by Direct Metal Laser Sintering Using Laser Cavitation
نویسندگان
چکیده
Additive manufactured (AM) metals are attractive materials for medical implants, as their geometries directly produced from computer-aided design (CAD)/computer-aided manufacturing (CAM) data. However, the fatigue properties of AM weak compared with bulk metals, which is an obstacle to practical applications metals. To improve we developed a mechanical surface treatment using laser cavitation. When irradiate pulsed metallic in water, ablation generated, and bubble that behaves like cavitation produced. The referred “laser cavitation”. In cavitation, use plastic deformation caused by impact force at collapse energy produces local melting same time. Thus, type alloying. this study, demonstrate improvement treated titanium alloy Ti6Al4V, was direct metal sintering (DMLS), evaluated morphology, roughness, residual stress, hardness, finally tested it torsion test. Unmelted particles on DMLS surface, cause cracks, were melted resolidified resulting reduction maximum heights roughness (Rz) about 75% arithmetical mean (Ra) 84% non-peened one. Although tensile stresses 80–180 MPa generated as-built compressive −80 introduced Furthermore, formed Ti4O5 oxide film, increased hardness 106%. Finally, performed torsional tests revealed extended life 19,791 cycles 36,288 applied shear stress (τa) 460 MPa, effective suppressing crack initiation.
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ژورنال
عنوان ژورنال: Metals
سال: 2023
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met13010181