CHAL-AMB2018-01-RS

Results for CHAL-AMB2018-01-RS: Part Residual Strains Using Neutron Diffraction

1. Overview

Figure 1 indicates the measurement positions for lattice strains on the X-Z plane centered on the midplane of the specimen.  Strains along the X, Y, Z directions were measured using neutron diffraction at the NIST Center for Neutron Research (NCNR) using the BT8 diffractometer. Measurement gauge volume is approximately a cube with edges that measure 1.5 mm. The measurements were conducted for an IN625 specimen and a 15-5 stainless steel specimen on the commercial build machine (CBM).

2. Summary Results

Note that the measurement in the legs are not symmetric about the center of the legs in the X direction. Looking at the X-Z plane, with the Y direction into the page, the left most measurement locations in the legs are closer to the Y-Z surface. Measurement gauge volumes’ centers are 1 mm from the Y-Z surface. for the left side of the legs. Whereas the measurement gauge volumes’ centers are 1.2 mm from the Y-Z surface for the right side of the legs. 

3. Data Files

The lattice strain components along the X, Y, and Z directions for each material are presented in data tables as tab-delimited text files. Each text file contains five columns, indicating the X position, Z position, ɛ_yy, ɛ_xx, and ɛ_zz respectively. The X and Z directions follow the convention established by Figure 1. The X and Z positions indicate the location (in millimeters) of the center of the measurement gauge volume, with the origin set at the bottom left corner of the X-Z plane. These data files 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.