Comparison of diffraction methods for measurement of surface damage in superalloys

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.

[1]  A. Wilkinson,et al.  Measurement of plastic strain of polycrystalline material by electron backscatter diffraction , 2005 .

[2]  J. Cohen,et al.  Residual Stress: Measurement by Diffraction and Interpretation , 1987 .

[3]  Mukul Kumar,et al.  Electron Backscatter Diffraction in Materials Science , 2000 .

[5]  A. Wilkinson,et al.  Quantitative deformation studies using electron back scatter patterns , 1991 .

[6]  A. Wilkinson,et al.  Quantification of plastic strain of stainless steel and nickel alloy by electron backscatter diffraction , 2006 .

[7]  D. Field,et al.  Analysis of local orientation gradients in deformed single crystals. , 2005, Ultramicroscopy.

[8]  Edward M. Lehockey,et al.  Mapping Residual Plastic Strain in Materials Using Electron Backscatter Diffraction , 2000 .

[9]  A. Wilkinson.  Examination of fatigue crack plastic zones using scanning-electron-microscope-based electron diffraction techniques , 1996 .

[10]  D. Davidson,et al.  Experimental and theoretical strain distributions for stationary and growing cracks , 1990 .

[11]  Qing Liu,et al.  Investigation of Macroscopic Grain Sub-Division of an IF-Steel during Cold-Rolling , 2002 .

[12]  A. Wilkinson,et al.  Study of dislocation structures near fatigue cracks using electron channelling contrast imaging technique (ECCI) , 1999, Journal of microscopy.

[13]  D. R. F. West,et al.  Effects of flux additions on inclusion removal and microstructure in electron beam button melting of Udimet 720 , 2000 .

[14]  D. Field,et al.  Microtextural Analysis of Grain Fragmentation in Aluminum , 2003 .

[15]  Xiaojing Huang,et al.  Interpretation of bent-crystal rocking curves using phase-space diagrams , 2000 .

[16]  N. Hansen,et al.  The deformation behaviour of grain boundary regions in polycrystalline aluminium , 1996 .

[17]  C. Fukuoka,et al.  Evolution of Intragranular Misorientation during Plastic Deformation , 2000 .

[18]  J. Stolken,et al.  Strategies for Analyzing EBSD Datasets , 2000 .

[19]  Michael E. Fitzpatrick,et al.  Analysis of Residual Stress by Diffraction using Neutron and Synchrotron Radiation , 2003 .

[20]  A. Rollett,et al.  Viewpoint: experimental recovery of geometrically necessary dislocation density in polycrystals , 2003 .

[21]  Jerome B. Hastings,et al.  Sagittal focusing of high-energy synchrotron X-rays with asymmetric Laue crystals. II. Experimental studies , 2001 .

[22]  W. King,et al.  Observations of lattice curvature near the interface of a deformed aluminium bicrystal , 2000 .

[23]  William Thomlinson,et al.  Implementation of diffraction-enhanced imaging experiments: at the NSLS and APS , 2000 .

[24]  L. Brewer,et al.  Misorientation Mapping for Visualization of Plastic Deformation via Electron Back-Scattered Diffraction , 2005, Microscopy and Microanalysis.

[25]  U. Krupp,et al.  Microstructurally short fatigue crack initiation and growth in Ti-6.8Mo-4.5Fe-1.5Al , 2000 .

[26]  E. Nes,et al.  Local lattice curvature and deformation heterogeneities in heavily deformed aluminium , 1989 .