Hostname: page-component-5c6d5d7d68-pkt8n Total loading time: 0 Render date: 2024-08-25T15:37:17.000Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  21 March 2011

M. Nazmy ,
M. Staubli ,
G. Onofrio  and
V. Lupinc
M. Nazmy
Affiliation:
ALSTOM POWER, Baden CH
M. Staubli
Affiliation:
ALSTOM POWER, Baden CH
G. Onofrio
Affiliation:
CNR-TeMPE, Milano, Italy
V. Lupinc
Affiliation:
CNR-TeMPE, Milano, Italy
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.44.1
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Huang, Z.W., Bowen, P., Davey, S. and Blenkinsop, P.A., Proc. of the 4th Int. Parsons Turbine Conference (1997) p. 489.Google Scholar
2 Austin, C. and Kelly, T.J., Proc. of 1st Symp. on “Structural Intermetallics”, eds. Darolia, R. et al., TMS publ. (1993) p. 1433.Google Scholar
3 Kim, Y.W., Journal of Metal, Vol. 46 (7) (1994) p. 30.Google Scholar
4 Kim, Y.W. and Dimiduk, D.M., Proc. of 2n Symp. on “Structural Intermetallics”, eds. Nathal, M.V. et al., TMS publ. (1997) p. 531.Google Scholar
5 Nazmy, M. and Staubli, M., US Patent 5,207,982 & EP. 45505 B1Google Scholar
6 Lupinc, V., Marchionni, M., Nazmy, M., Onofrio, G., Rémy, L., Staubli, M. and Yin, W.M., Proc. of “Structural Intermetallics 1997”, eds. Nathal, M.V. et al., TMS publ. (1997) p. 515.Google Scholar
7 Tomasi, A., Gialanella, S., Orsini, P.G. and Nazmy, M., MRS Symposium Proceedings Vol. 364 (1995) p. 999.10.1557/PROC-364-999Google Scholar
8 Cowles, B.A., Int. J. Fract, Vol. 80 (1996) p. 147.10.1007/BF00012667Google Scholar
9 Steif, P.S., Jones, J.W., Harding, T., Rubal, M.P., Gandelsman, V.Z., Biery, N. and Pollock, T.M., Proc. of 2n Symp. on “Structural Intermetallics”, eds Nathal, M.V. et al., TMS publ. (1997) p. 435.Google Scholar
10 Newman, J.C. and Raju, I.S., NASA Technical Note, TP-1578 (1979).Google Scholar
11 Brown, W.F. and Srowley, J.E., ASTM-STP 410 (1966) p. 1.Google Scholar
12 McKelvey, A.L., Venkateswara Rao, K.T. and Ritchie, R.O., Metallurgical and Materials Transactions A, Vol. 31A (2000) p. 1413.Google Scholar
13 Lou, J., Mercer, C. and Soboyejo, W.O, MRS Symposium Proceeding, Vol. 646 (2001) N1.7.1 10.1557/PROC-646-N1.7.1Google Scholar