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Results for CHAL-AMB2018-01-RS: Part Residual Strains

Results for CHAL-AMB2018-01-RS: Part Residual Strains

Energy-dispersive X-ray diffraction measurements

1.  Overview

Energy dispersive diffraction experiments were conducted for an IN625 specimen on the ID1A3 beamline at the Cornell High Energy Synchrotron Source (CHESS). The incident X-ray beam was masked to a 0.25 mm × 0.25 mm cross-section by a pair of incident beam slits. The beam was diffracted through two sets of slits with a fixed 2θ angle of 9.18°. The multiple slit geometry results in a ‘rhomboidal’ shaped diffraction volume of 0.25 mm × 1.5 mm × 0.25 mm, where the long dimension is along the y dimension of the sample. Diffraction data were collected over the X-Z plane at the mid-point in y. The measurement locations for the lattice strains are illustrated in Figure 1.

Measurement Locations
Figure 1:  Measurement locations for the residual strains measured on the ID1A3 beamline at the Cornell High Energy Synchrotron Source (CHESS).


2.  Summary Results

Figure 2 shows the lattice strain components of the strain along the (a) build direction (z), (b) the longitudinal strain (x), (c) the z-x strain at 45o and (d) the shear strain (γxz). The γxz was calculated by using the equation γxz = 1/2 (εxx + εzz) - εzx.

Residual Strain Maps
Figure 2:  Residual strain maps over the investigated middle cross-section of the sample (y = 2.5 mm) of the (a) strain along the build direction (z), (b) the longitudinal strain (x), (c) the z-x strain at 45o and (d) the shear strain component (γxz). The X and Z positions are shown in mm.


3.  Data Files

The lattice strain components along the X, Z and the Z-X at 45o for the IN625 specimen are presented in a data table as a tab-delimited text file. The text file contains six columns, indicating the X position, the Z position, the εxx, the εzz, the εzx(at 45o) and the γxz. The X and Z positions indicate the location (in mm) of the center of the measurement gauge volume, with the origin set at the bottom left corner of the X-Z plane.

Link to the IN625 synchrotron X-ray results text file:

Additionally, each of the results plots in Figure 2 are provided as high resolution Portable Network Graphics (*.png) image files, and Matlab figure (*.fig) files.

Link to IN625 plot figure files:

PNG files:

Matlab .fig files

Created October 15, 2018, Updated June 2, 2021