Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Creep Properties of Plasma Carburized and CrN Coated Ti-6Al-4V Alloy

플라즈마 침탄 및 CrN 코팅된 Ti-6Al-4V 합금의 구조 및 Creep특성

  • Wey Myeong-Yong (Department of Materials Engineering, Chungbuk National University) ;
  • Park Yong-Gwon (Department of Materials Engineering, Chungbuk National University)
  • Published : 2004.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization treatment and CrN film coating were carried out. Effects of the plasma carburization and CrN coating were analyzed and compared with the non-treated alloy by mechanical and creep tests. After plasma carburization and CrN coating treatments, the carburized layer was about 150 ${\mu}m$ in depth and CrN coated layer was about 7.5 ${\mu}m$ in thickness. Hardness value of about $H_{v}$ 402 of the non-treated alloy was improved to $H_{v}$ 1600 and 1390 by plasma carburization and CrN thin film coating, respectively. Stress exponent(n) was decreased from 9.10 in CrN coating specimen to 8.95 in carburized specimen. However, the activation energy(Q) was increased from 242 to 250 kJ/mol. It can be concluded that the static creep deformation for Ti-6Al-4V alloy is controlled by the dislocation climb over the ranges of the experimental conditions.

Keywords

References

  1. H. Margolin, J. C. Willams, J. C. Chesnutt and G. Lutjering, Proc. of the 4th Int's Conf. on Ti, 169-216, 1 (1980)
  2. W. Lee and C. Lin, Mater. Sci. Eng., 48-59, A241 (1998) https://doi.org/10.1016/S0921-5093(97)00471-1
  3. D. Nakayama and H, Ido, Report of Kobe Steel, 43, 71 (1993)
  4. B. Berghaus, U. S. Patent 3181029 (1965)
  5. Edward Rolinski, Mater. Sci. Eng., A108, 37 (1989) https://doi.org/10.1016/0921-5093(89)90404-8
  6. T. M. Muraleedharan and E. I. Meletis, Thin Solid Films, 221, 104 (1992) https://doi.org/10.1016/0040-6090(92)90802-I
  7. A. Raveh and R. Avni, Thin Solid Films, 186, 241 (1990) https://doi.org/10.1016/0040-6090(90)90146-5
  8. J. Okamoto and M. Yakshiji, J. Heat Treatment, 40, 25 (2001)
  9. J. Okamoto and M. Yakshiji, J. Heat Treatment, 40, 88 (2001)
  10. E. W. Turns, J. W. Browning and R. L. Jones, Plat. Surf. Finish., 62, 443 (1975)
  11. Ikenaga Masaru, Special Steel, 47(3), 6 (1998)
  12. Kotahira, J. JSME (A), 64-628, 3032 (1998)
  13. Ikenaga Masaru and H. T. Suzuki, J. Heat Treatment, 41, 305 (2000)
  14. H. T. Suzuki, J. JSME, 66, 755 (2001)
  15. W. F. Smith, Principles of Mat. Sci. Eng., McGraw-Hill, 101 (1986)
  16. F. Garfulo, Trans. AIME, 351, 229 (1963)
  17. J. H. Dorn, The Mechanical Behaviour of Materials at Elevated Temperature, p. 432, McGraw-Hill, New York (1961)
  18. J. Weertman, Trans. AIME, 207, 218 (1960)
  19. S. H. Hong and J. Weertman, Acta Met., 34, 735 (1986) https://doi.org/10.1016/0001-6160(86)90188-4
  20. S. J. Zhu, D. Mukherji and W. Chen, Mater. Sci. Eng., A256, 301 (1989) https://doi.org/10.1016/S0921-5093(98)00617-0