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.

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 45^o and (d) the shear strain (γ_xz). The γ_xz was calculated by using the equation γ_xz = 1/2 (ε_xx + ε_zz) - ε_zx.

3.  Data Files

The lattice strain components along the X, Z and the Z-X at 45^o 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 ε_xx, the ε_zz, the ε_zx(at 45^o) and the γ_xz. 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. This data file and figures showing all measured strain components are available through the NIST Configurable Data Curation System at ambench.nist.gov. A direct link to the synchrotron X-ray data and metadata is here.