Fig. 1 Effect of heat treatment at 760 oC (1hr, air cooling) onthe anodic polarization behavior of CP-Ti made by various proc-ess in 50 oC 20% H2SO4; (a) CP-TiR (b) CP-TiF (c) CP-TiA.
Fig. 2 Effect of heat treatment at 760 ℃(1hr, air cooling)on the anodic polarization behavior of Ti-6Al-4V alloys madeby various process in 50 oC 20% H2SO4; (a) Ti-64R (b) Ti-64F(c) Ti-64A.
Fig. 3 Effect of manufacturing process on the anodic polarization behavior of CP-Ti and Ti-64 made by various process in 50 oC 20%H2SO4; (a) CP-Ti(R,F,A) as-received (b) CP-Ti(R,F,A) heat-treated (c) Ti-64(R,F,A) as-received (d) Ti-64(R,F,A) heat-treated.
Fig. 4 Optical microstructure of (a, a’) cold-rolled CP-TiR, (b, b’) forged CP-TiF, and (c, c’) additive-manufactured CP-TiA.
Fig. 5 Optical microstructure of (a, a’) cold-rolled Ti-64R, (b, b’) forged Ti-64F, and (c, c’) additive-manufactured Ti-64A.
Fig. 6 Polarization behavior of CP-Ti and Ti-64 alloy made by various process in 20% H2SO4 + 0.1% HF (a) CP-Ti , (b) Ti-64.
Fig. 7 Nyquist plot of CP-Ti and Ti-64 alloy made by various process at +1V(SCE) in 20% H2SO4 (+ 0.1% HF); (a) CP-Ti in 20%H2SO4 (b) CP-Ti in 20% H2SO4 + 0.1% HF (c) Ti-64 in 20% H2SO4 (d) Ti-64 in 20% H2SO4 + 0.1% HF.
Fig. 8 Rp(polarization resistance) of (a) CP-Ti and (b) Ti-64 alloy made by various process at +1V(SCE) in 20% H2SO4 and 20%H2SO4 + 0.1% HF.
Fig. 9 Mott-Schottky plot of CP-Ti and Ti-64 alloy made by various process at +1V(SCE) in 20% H2SO4 (+ 0.1% HF); (a) CP-Tiin 20% H2SO4, (b) CP-Ti in 20% H2SO4 + 0.1% HF, (c) Ti-64 in 20% H2SO4, (d) Ti-64 in 20% H2SO4 + 0.1% HF.
Table 1 Chemical composition of Ti-Gr.2 (wt%)
Table 2 Chemical composition of Ti-Gr.5 (wt%)
Table 3 Donor density of CP-Ti and Ti-64
References
- T. V. Ramana Rao, Metal Casting: Principles and Practice, pp. 1-3, New Age International, New Delhi (2007).
- Z. Wusatowski, Fundamentals of Rolling, p. 1, Pergamon Press, Oxford (2013).
- T. F. Waters, Fundamentals of Manufacturing for Engineers, p. 49 Taylor & Francis, London (2002).
- ASTM F2792-12a, Standard Terminology for Additive Manufacturing Technologies, ASTM, West Conshohocken, PA (2015).
- I. Gibson, D. Rosen, and B. Stucker, Additive Manufacturing Technologies, p. 245, Springer, New York (2014).
- D. M. Keicher and W. D. Miller, LENSTM moves beyond RP to direct fabrication, Metal Powder Report, 53:26 (1998).
- G. K. Lewis, R. Nemec, J. Milewski, D. J. Thoma, D. Cremers, and M. Barbe, Proc. ICALEO '94, p. 17, Laser Institute of America, Orlando (1994).
- M. A. House, Proc. Solid Freeform Fabrication Symposium, p. 239, Austin, TX (1996).
- M. J. Donachie Jr., Titanium: a technical guide, 2nd ed., ASM international, Materials Park, Ohio (2000).
- M. Levy, Corrosion, 23, 236 (1967). https://doi.org/10.5006/0010-9312-23.8.236
- J. Vaughan, A. Alfantazi, J. Electrochem. Soc., 153, B6 (2006). https://doi.org/10.1149/1.2126580
- Z. B. Wang, H. X. Hu, Y. G. Zheng, W. Ke, and Y. X. Qiao, Corros. Sci., 103, 50 (2016). https://doi.org/10.1016/j.corsci.2015.11.003
- M. T. Jovanovic, S. Tadic, S. Zec, Z. Miskovic, and I. Bobic, Mater. Des., 27, 192 (2006). https://doi.org/10.1016/j.matdes.2004.10.017
- H. Gong, K. Rafi, T. Starr, and B. Stucker, Proc. 24th Annual International Solid Freeform Fabrication Symposium-An Additive Manufacturing Conf., pp. 12-14, Austin, TX (2013).
- S. Takemoto, M. Hattori, M. Yoshinari, E. Kawada, and Y. Oda, Biomaterials, 26, 829 (2005). https://doi.org/10.1016/j.biomaterials.2004.03.025
- R. Boyer, G. Welsch, and E. W. Collings, Materials Properties Handbook: Titanium Alloys, ASM International, Materials Park, Ohio (1994).
- D. J. Blackwood and L. M. Peter, Electrochim. Acta, 34, 1505 (1989). https://doi.org/10.1016/0013-4686(89)87033-1
- D. J. Blackwood, L. M. Peter, and D. E. Williams, Electrochim. Acta, 33, 1143 (1988). https://doi.org/10.1016/0013-4686(88)80206-8
- D. J. Blackwood, R. Greef, and L. M. Peter, Electrochim. Acta, 34, 875 (1989). https://doi.org/10.1016/0013-4686(89)87123-3
- A. Robin, J. L. Rosa, and H. R. Z. Sandim, J. Appl. Electrochem., 31, 455 (2001). https://doi.org/10.1023/A:1017584120460
- H. H. Huang, Biomaterials, 23, 59 (2002). https://doi.org/10.1016/S0142-9612(01)00079-5
- I. Gibson, D. Rosen, and B. Stucker, Additive Manufacturing Technologies, p. 266, Springer, New York (2014).