Precipitation effect on Surface roughness at Ti-6Al-4 V ELI alloy during Ultra-Precision Machining

• Published in: International journal on interactive design and manufacturing 2023-10, Vol.17 (5), p.2607-2615
• Main Authors: Manjunath, K, Tewary, Suman, Khatri, Neha, Cheng, Kai
• Format: Article
• Language: English
• Subjects: 3-D printers; Additive manufacturing; Biocompatibility; CAE) and Design; Computer-Aided Engineering (CAD; Diamond machining; Diamond tools; Electronics and Microelectronics; Engineering; Engineering Design; Industrial Design; Instrumentation; Interstitials; Lasers; Mechanical Engineering; Original Paper; Particle size; Precipitates; Precision machining; Strength to weight ratio; Surface finishing; Surface properties; Surface roughness; Surgical implants; Thermodynamic properties; Titanium alloys; Titanium base alloys; Tool wear; Turning (machining); Vanadium; Weight reduction
• ISSN: 1955-2513; 1955-2505
• DOI: 10.1007/s12008-022-01058-x

Ti6Al4V ELI (Extra-low interstitial) alloy is quite popular due to its application in the fields of biomedical, aerospace, optics and aeronautic industry, because of its high-strength to weight ratio, anti-corrosive and biocompatibility, and lightweight. This alloy contains low interstitials, which gradually improves mechanical and thermal properties and is thus quite popular as titanium medical-grade. Ultra-precision machining (UPM) of Ti6Al4V ELI alloy is treated as a difficult to cut process due its chemical reactivity with the diamond tool. Also, machining Titanium alloy for precision engineering applications is quite challenging due to tool wear. In this paper, an attempt is made to understand the precipitation effect that occurs at Ti-6Al-4 V ELI alloy surfaces during diamond turning. The precipitation generation highly influences surface finishing and imposes serious precision engineering challenges. Therefore, this paper further attempts to scientifically understand the precipitation effect on surface roughness and surface finishing in UPM of Ti6Al4V ELI alloy, particularly through the integrated analytical and experimental approach. The results show that the generation of precipitates induces cracks, scratch marks and pits, which deteriorate the surface quality. The Surface Roughness (Ra) obtained with significant precipitation is 0.1484 μm during the diamond turning of Ti6Al4V.