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Comparison of diffraction methods for measurement of surface damage in superalloys

Published online by Cambridge University Press:  01 July 2006

L.N. Brewer ,
M.A. Othon ,
Y. Gao ,
B.T. Hazel ,
W.H. Buttrill  and
Zhong Zhong
L.N. Brewer*
Affiliation:
GE Global Research Center, Niskayuna, New York 12309
M.A. Othon
Affiliation:
GE Global Research Center, Niskayuna, New York 12309
Y. Gao
Affiliation:
GE Global Research Center, Niskayuna, New York 12309
B.T. Hazel
Affiliation:
GE Aircraft Engines, Cincinnati, Ohio 45215
W.H. Buttrill
Affiliation:
GE Aircraft Engines, Cincinnati, Ohio 45215
Zhong Zhong
Affiliation:
National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11970
*
a) Address all correspondence to this author. e-mail: [email protected] Present address: Sandia National Laboratories, Albuquerque, NM 87185-1411.
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Abstract

Surface damage from machining operations is a potential source of failure in metallic components. The ability to quantitatively characterize the depth and extent of the damage layer is critical to controlling the machining process. Electron back scattered diffraction and synchrotron high energy x-ray diffraction were applied to the measurement of machining surface damage in a Ni-based super alloy. Both techniques clearly showed a plastic deformation profile below the surface as a function of the machining conditions used. Using the average intragrain misorientation parameter, the electron back scattered diffraction was able to quantify the amount of surface damage from one surface treatment to another. In addition, the x-ray diffraction measurements were able to simultaneously measure the elastic strain as a function of depth from the surface.

Keywords

MachiningScanning electron microscopy (SEM)X-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1775 - 1781
Copyright
Copyright © Materials Research Society 2006

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