Evaluation of Heat Treatment and Ceramic Coating in Creep of Ti-6Al-4V

Abstract:

This study aimed to evaluate the resistance of a Ti-6Al-4V alloy in creep after heat treatments. It was used a Ti-6Al-4V alloy in cylindrical bars forms, forged condition and annealing at 190oC for 6 hours and cooled in air. The microstructure of Ti-6Al-4V alloy was evaluated after heat treatment and was submitted to creep tests at 600oC and stress conditions from 125 to 319 MPa at constant load. The Widmanstätten structure was obtained by heat treatment. Yttria (8 wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. The alloy with Widmanstätten structure and ceramic coating shows greater resistance to creep and oxidation with a longer life time in creep. At higher stress condition, 600°C and 319 MPa, the Ti-6Al-4V alloy with ceramic coating didn’t show higher creep resistance. This condition presented higher tp value and the value. It occurred because at high stress condition the coating is very fragile, decreasing your creep resistance.

• Periodical: Materials Science Forum (Volumes 660-661)
• Pages: 235-240
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.660-661.235
• Online since: October 2010
• Authors: Tarcila Sugahara, L.A.N.S. Briguente, L.M. Yogi, Danieli A.P. Reis, Carlos de Moura Neto, M.J.R. Barboza, Antônio Augusto Couto
• Keywords: Creep, Heat Treatment, Plasma Sprayed Coatings, Ti6Al4V

References

[1] M. Es-Souni: Mater. Charact. 46 (2001), p.365.

[2] R. R. Boyer: Mater. Sci. Eng. A 213 (1996), p.103.

[3] G. Norris: Felling the heat in: Metal Bulletin Monthly Vol. 386 (1994), pp.36-39.

[4] R. W. Evans and B. Wilshire: Introduction to Creep (1993), p.115.

[5] W. D. Callister Jr.: Materials Science and Engineering (2000).

[6] S. A. Souza: Ensaios Mecânicos de Materiais Metálicos (1982).

[7] http: / www. diferro. com. br/saiba_glossario. asp, (2007).

[8] S. Abkowitz, J. J. Burke and R. H. Hiltz Jr.: Technology of Structural Titanium, D. Van Nostrand Company (1995), pp.31-32.

[9] A. Rosen and A. Rottem: Mater. Sci. Eng. Vol. 22 (1976), p.23.

[10] K.V. Sai Srinadh and V. Singh: Bull. Mater. Sci. Vol. 27 (2004), pp.347-354.

[11] R. Westergard, N. Axén, U. Wiklund and S. Hogmark: Wear Vol. 246 (2000), p.12.

[12] P.A. Siermers and R.L. Mehan : Nasa Tech. Rept. NA53-21727 (1982), p.828.

[13] K. Lapierre, H. Herman and A.G. Tobin: Ceram. Eng. Sci. Proc. Vol. 12 (1991), p.1201.

[14] H. Xu, S. Gong and L. Deng: Thin Solid Films Vol. 334 (1998), p.98.

[15] Y.H. Sohn, E. Y. Lee, B. A. Nagaraj, R. R.; Biederman and R.D. Sisson JR.: Surface and Coatings Technology Vol. 146-147 (2001), p.132.

DOI: 10.1016/s0257-8972(01)01369-x

[16] D.A.P. Reis, C.R.M. Silva, M.C.A. Nono, M.J.R. Barboza, F. Piorino Neto and E.A.C. Perez: Materials at High Temperatures Vol. 22 (2006), p.449.

DOI: 10.1179/mht.2005.053

[17] M. J. R. Barboza, C. Moura Neto and C.R.M. Silva : Mater. Sci. Eng. A Vol. 369 (2004), p.201.

[18] D.A.P. Reis, C.R.M. Silva, M.C.A. Nono, M.J.R. Barboza, F. Piorino Neto and E.A.C. Perez: Mater. Sci. Eng. A Vol. 399 (2005), p.276.

[19] M. J. R. Barboza, E. A. C. Perez, M. M. Medeiros, D. A. P. Reis, M. C. A. Nono, F. Piorino Neto and C. R. M. Silva: Mater. Sci. Eng. A Vol. 428 (2006), p.319.

[20] D.A.P. Reis, C. Moura Neto, C.R.M. Silva, M.J.R. Barboza and F. Piorino Neto: Mater. Sci. Eng. A Vol. 486 (2008), p.421.

[21] American Society for Testing and Materials (ASTM), Surface Engineering 5, Philadelphia (1990).