Effect of surface defects on the fatigue behavior of a cast TiAl alloy

Abstract

The effect of surface defects on the performance of TiAl-base alloys is an issue of importance in contemplating their application into engine components. Due to the relatively low ductility and low impact resistance of gamma alloys the validation of models for estimating economic life and for safe-life approaches employed for components becomes of great importance. Surface defects can be attributed to various sources during the manufacturing or handling of the components. In fact, little is known about the detrimental effects of surface defects on gamma alloys. In the present study, the effect of artificially introduced surface defects, on the high cycle fatigue behavior of the Ti-47Al-2W-0.5Si, will be investigated and correlated with the crack growth behavior at 700°C. The results are reported in the form of the Kitagawa diagram in which the safe and unsafe zones for crack advance and fracture are defined.

This is a preview of subscription content, access via your institution.

References

  1. 1

    Z.W. Huang, P. Bowen, S. Davey and P.A. Blenkinsop, Proc. of the 4th Int. Parsons Turbine Conference (1997) p. 489.

  2. 2

    C. Austin and T.J. Kelly, Proc. of 1st Symp. on “Structural Intermetallics”, eds. R. Darolia et al., TMS publ. (1993) p. 1433.

  3. 3

    Y.W. Kim, Journal of Metal, Vol. 46 (7) (1994) p. 30.

    CAS  Google Scholar 

  4. 4

    Y.W. Kim and D.M. Dimiduk, Proc. of 2n Symp. on “Structural Intermetallics”, eds. M.V. Nathal et al., TMS publ. (1997) p. 531.

  5. 5

    M. Nazmy and M. Staubli, US Patent 5,207,982 & EP. 45505 B1

  6. 6

    V. Lupinc, M. Marchionni, M. Nazmy, G. Onofrio, L. Rémy, M. Staubli and W.M. Yin, Proc. of “Structural Intermetallics 1997”, eds. M.V. Nathal et al., TMS publ. (1997) p. 515.

  7. 7

    A. Tomasi, S. Gialanella, P.G. Orsini and M. Nazmy, MRS Symposium Proceedings Vol. 364 (1995) p. 999.

  8. 8

    B.A. Cowles, Int. J. Fract, Vol. 80 (1996) p. 147.

    CAS  Article  Google Scholar 

  9. 9

    P.S. Steif, J.W. Jones, T. Harding, M.P. Rubal, V.Z. Gandelsman, N. Biery and T.M. Pollock, Proc. of 2n Symp. on “Structural Intermetallics”, eds M.V. Nathal et al., TMS publ. (1997) p. 435.

  10. 10

    J.C. Newman and I.S. Raju, NASA Technical Note, TP-1578 (1979).

    Google Scholar 

  11. 11

    W.F. Brown and J.E. Srowley, ASTM-STP 410 (1966) p. 1.

    Google Scholar 

  12. 12

    A.L. McKelvey, K.T. Venkateswara Rao and R.O. Ritchie, Metallurgical and Materials Transactions A, Vol. 31A (2000) p. 1413.

    CAS  Article  Google Scholar 

  13. 13

    J. Lou, C. Mercer and W.O Soboyejo, MRS Symposium Proceeding, Vol. 646 (2001) N1.7.1

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to M. Nazmy.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Nazmy, M., Staubli, M., Onofrio, G. et al. Effect of surface defects on the fatigue behavior of a cast TiAl alloy. MRS Online Proceedings Library 646, 419–424 (2000). https://doi.org/10.1557/PROC-646-N5.44.1

Download citation