Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-26T04:39:54.106Z Has data issue: false hasContentIssue false
  • English
  • Français

Thermal Expansions of the Beta and Gamma Phases in a Co–Ni–Fe Superalloy Determined by X-ray Diffraction

Published online by Cambridge University Press:  31 January 2011

M. S. Seehra ,
C. Cionca  and
A. Manivannan
M. S. Seehra*
Affiliation:
Physics Department, West Virginia University, Morgantown, West Virginia 26506-6315
C. Cionca
Affiliation:
Physics Department, West Virginia University, Morgantown, West Virginia 26506-6315
A. Manivannan
Affiliation:
Physics Department, West Virginia University, Morgantown, West Virginia 26506-6315
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Commercially useful multiphase alloy Inconel 783 is made up of Ni(28%), Fe(25%), and Co(35%) with smaller amounts of Cr, Al, Nb, Mo, Ti, C, and Si. In this work, relative temperature variations of the lattice constants a(T)/a0 of the gamma (face-centered-cubic) and beta (body-centered-cubic) phases of this alloy are determined from 97 to 773 K using analyses of their x-ray diffraction (XRD) patterns. Plots of a(T)/a0 for the two phases vary from 1.0 at 97 K to 1.012 at 773 K and show that (i) for T = 500 K, thermal expansion of the β phase is larger than that of the = phase; and (ii) an abrupt jump is observed near 300 K. The appearance of new lines above 700 K in XRD representing Co2CrO4 and CoCr2O4 is interpreted in terms of the oxidation of the γ phase, whereas the β phase is oxidation resistant. The anomalous change in a(T)/a0, observed near 300 K and accompanied by a similar change in the temperature variation of the initial magnetic susceptibility, is not well understood. A brief discussion on the implications of these results is presented.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 8 , August 2000 , pp. 1719 - 1723
Copyright
Copyright © Materials Research Society 2000

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.Wasserman, E.F. in Ferromagnetic Materials, edited by Buschow, K.H.J and Wohlfarth, E.P. (North-Holland, New York, 1990), Vol. 5, pp. 237–322.Google Scholar
2.Babu, V.S., Pavlovic, A.S., and Seehra, M.S., J. Appl. Phys. 79, 5185 (1996).Google Scholar
3.Smith, J.S. and Heck, K.A. in Superalloys 1996, edited by Kissinger, R.D., Deye, D.J., Anton, D.L., Cetel, A.D., Nathal, M.V., Pollock, T.M., and Woodford, D. A. (Minerals, Metals and Materials Society, Warrendale, PA, 1996), pp. 91–100;Google Scholar
See also Smith, J.S., Smith, D.F. Jr, Fisher, R.L., and Heck, K.A., U.S. Patent No. 5 403 547 (1995).Google Scholar
4.Mannan, S. and deBarbadillo, J.J., International Gas Turbine and Aeroengine Congress and Exhibition, Stockholm, Sweden (American Society of Mechanical Engineers, 1998), pp. 1–10.Google Scholar
5.Higginbotham, B.E., Chang, K-M., Mannan, S., and deBarbadillo, J.J., Proceedings of The First International Non-Ferrous Processing and Technology Conference, St. Louis, Missouri, March 1997, pp. 483–489.Google Scholar
6.Lyons, J.S., Reynolds, A.P. and Clawson, J.D., Scripta Materialia 37, 1059 (1997).CrossRefGoogle Scholar
7.Seehra, M.S., Manivannan, A., Cionca, C., Ma, L., and Chang, K-M., in Advanced Technologies for Supervalloy Affordability, edited by Chang, K-M., Srivastava, S.K., Furrer, D.W., and Bain, K.R. (Minerals, Metals and Materials Society, Warrendale, PA, 2000) pp. 141–148.Google Scholar
8.Fahmy, A.A. and Ragai, A.N., J. Appl. Phys. 41, 5108 (1970).CrossRefGoogle Scholar
9.Tummala, R.R. and Friedberg, A.L., J. Appl. Phys. 41, 5104 (1970).CrossRefGoogle Scholar
10.Bozorth, R.M., Ferromagnetism (D. Van Nostrand, Princeton, NJ, 1968).Google Scholar
11.Roberts, C.S., Trans. AIME 197, 203 (1953).Google Scholar
12.Colling, D.A. and Carr, W.J. Jr, J. Appl. Phys. 41, 5125 (1970).CrossRefGoogle Scholar
13.Seehra, M.S. and Babu, V.S., J. Mater. Res. 11, 1133 (1996).CrossRefGoogle Scholar