Hostname: page-component-8448b6f56d-42gr6 Total loading time: 0 Render date: 2024-04-24T19:00:13.115Z Has data issue: false hasContentIssue false
  • English
  • Français

High-Temperature Fatigue Crack Propagation in P/M Ni3Al-B Alloys

Published online by Cambridge University Press:  28 February 2011

K.-M. Chang ,
S.C. Huang  and
A.I. Taub
K.-M. Chang
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
S.C. Huang
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
A.I. Taub
Affiliation:
General Electric Corporate Research and Development, Materials Laboratory Schenectady, New York 12301
Get access

Abstract

Ductile Ni3Al-B type intermetallic alloys show a unique fatigue crack growth behavior at elevated temperatures. A crack propagation mechanism has been investigated in an experimental P/M alloy by testing the alloys with different fatigue frequencies at 400°C. The Ni3Al-B intermetallic alloy shows a substantial time-dependence of fatigue cracl growth rate when tested in air. Under a given cyclic stress intensity, an order of magnitude difference of crack growth rate was observed by decreasing the fatigue frequency. However, such a time-dependence did not occur when the alloy was tested in vacuum. It is concluded that “dynamic” embrittlement in an oxidation environment is the major factor controlling the fatigue crack growth in ordered Ni3Al-B alloys at elevated temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 303
Copyright
Copyright © Materials Research Society 1987

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. Taub, A.I., Huang, S.C., and Chang, K.-M.: Met. Trans. A, 1984, vol. 15A, p. 339.Google Scholar
2. Liu, C.T. and Koch, C.C.: “Technical Aspects of Critical Materials Use by the Steel Industry, vol. IIB,” National Bureau of Standards, NBSIR 83-2679-2, 1983, p. 42–1; also editor's note in Iron Age, September 24, 1982, p. 63.Google Scholar
3. Aoki, K. and Izumi, O.: J. Japan Inst. Met., 1979, vol. 43, p. 1190; ibid, 1979, vol. 43, p. 358.Google Scholar
4. Chang, K.-M., Huang, S.C., and Taub, A.I.: “Rapidly Solidified Ni Al-B Based Intermetallics,” GE-CRD Report No. 86CRD202, October 1989.Google Scholar
5. Fuchs, G.E., Kuruvilla, A.K., and Stoloff, N.S.: “High Cycle Fatigue and Crack Growth in Polycrystalline submitted to Met. Trans. A. Ni3Al”, submitted to Met. Trans. A.Google Scholar
6. Liu, C.T., White, C.L., and Horton, J.A.: Acta Met., vol. 33, p. 213.CrossRefGoogle Scholar
7. Chang, K.-M.: "Improving Crack Growth Resistance of IN 718 Alloy Through Thermomechanical Processing," GE-CRD Report No. 85CRD187, October 1985.Google Scholar
8. Johnson, H.H.: Mat. Res. Stand., 1965, vol. 5, no. 9, p. 442.Google Scholar
9. Solomon, H.D. and Coffin, L.F.: ASTM STP 520, p. 112, 1973.Google Scholar