Cutting force, chip formation, and tool wear during the laser-assisted machining a near-alpha titanium alloy BTi-6431S
BTi-6431S is a promising material for aero-engine and supersonic speed aircraft parts application. However, the machinability of the alloy is relatively poor due to its high mechanical properties at high temperature. Laser-assisted machining (LAM) is a promising solution to reduce the cutting pressures when machining difficult-to-cut materials, such as Ti-6Al-4V alloy. In this paper, the machinability of this near-alpha alloy has been investigated in terms of cutting force, chip formation, and tool wear in different laser power conditions over a range of cutting parameters. This investigation shows that the BTi-6431S alloy is considerably less responsive to LAM compared to Ti-6Al-4V, and the tool life was not extended by using the LAM process for BTi-6431S. The main tool failure mode is flank wear and rake face chipping under conventional machining (CM) condition, while the diffusion wear is the main tool failure mode under LAM. The machinability of BTi-6431S near-alpha titanium alloy is significantly lower than that of Ti-6Al-4V alloy.
KeywordsNear-alpha titanium alloy Laser-assisted machining Cutting forces Chip formation Tool wear
Unable to display preview. Download preview PDF.
- 6.Veiga C, Davim JP, Loureiro AJR (2012) Properties and applications of titanium alloys: a brief review. Rev Adv Mater Sci 32:133–148Google Scholar
- 7.E.W.Collings. The physical metallurgy of titanium alloys. American Society for Metals (1984).Google Scholar
- 9.X.Q.Wang, W.Q.Wang, H.H.MA. Microstructure and mechanical properties of high temperature and high strength BTi-6431S alloy at 700 °C. The Chinese Journal of Nonferrous Metals, 20 (2010) s792-s795.Google Scholar
- 11.Sun S, Brandt M, Dargush MS (2010) The effect of a laser beam on chip formation during machining of Ti6Al4V alloy. Metall Mater Trans A 41A:1573–1581Google Scholar
- 12.S. Sun, M. Brandt, M. Dargusch. Effect of laser beam on the chip formation in machining of titanium alloys. ICALEO-27th International Congress on Applications of Lasers and Electro-Optics. Temecula, CA. (2008) 901–09Google Scholar
- 14.Sun S, Brandt M, Banes JE, Dargusch M (2011) Experimental investigation of cutting forces and tool wear during laser-assisted milling of Ti-6Al-4V-alloy. Proc. IMechE, PartB. J Eng Manufacture 225:1512–1527Google Scholar
- 20.A.K.Mathew. Prediction of the wear & evolution of cutting tools in a carbide/Ti-6Al-4V machining tribosystem by volumetric tool wear characterization & modeling. Doctor dissertation, Clemson University, (2012)Google Scholar
- 21.P.J.Arrazola, F.Meslin, S.Marya. Serrated chip prediction in numerical cutting models. In:Proceedings of the CIRP Congress 8 WMMO. 2005, 115–122.Google Scholar