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          How to Get InvolvedResults for CHAL-AMB2018-01-RS: Part Residual Strains

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**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. This data file and figures showing all measured strain components are available in a data publication****at https://doi.org/10.18434/mds2-3052. When using these data, please follow the citation instructions on the data publication landing page.

These results are also described in a journal publication:

Phan, T.Q., Strantza, M., Hill, M.R. *et al.* Elastic Residual Strain and Stress Measurements and Corresponding Part Deflections of 3D Additive Manufacturing Builds of IN625 AM-Bench Artifacts Using Neutron Diffraction, Synchrotron X-Ray Diffraction, and Contour Method. *Integr Mater Manuf Innov* **8**, 318–334 (2019). https://doi.org/10.1007/s40192-019-00149-0.
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    Created October 15, 2018, Updated December 19, 2023
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