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**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).





 
      Measurement locations for strain values measured at the NIST Center for Neutron Research (NCNR)
Figure 1: Measurement locations for strain values measured at the NIST Center for Neutron Research (NCNR).**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.



 
      Measured residual strains for the 15-5 test specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z)
Figure 2:  Measured residual strains for the 15-5 test specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z).

 
      Measured residual strains for the In625 specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z)
Figure 3: Measured residual strains for the In625 specimen. Top image is longitudinal strain (x), middle is transverse strains (y), and bottom is strain in the build direction (z).**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, ɛyy, ɛxx, and ɛzzrespectively. 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.
  Additive manufacturing

    
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Lyle E. Levine
    
      
  lyle.levine@nist.gov
  (301) 975-6032

  Brandon Lane
    
      
  brandon.lane@nist.gov
  (301) 975-5471

Created May 24, 2018, Updated December 19, 2023
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