Ultrasonic Characterization for Hybrid Additive Manufacturing of 316L Stainless Steel with Interlayer Milling

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IEEE-LANNM talk - Jazmin Ley

Jazmin is originally from South Texas. She attended The University of Rio Grande Valley (UTRGV) for her undergraduate and master’s degrees where she worked on a load sensor development for a railroad suspension system. She is currently, a student at the University of Nebraska Lincoln (UNL). She has been an intern in the Naval Research Enterprise Intern Program (NREIP) for the last two summers where she gained experience working in additive manufacturing of nickel aluminum bronze (NAB) in both the laser powder bed fusion and direct energy deposition systems. Currently, she is working on the ultrasonic evaluation of hybrid additively manufactured 316L-SS prints as part of the DOE NNSA Laboratory Residency Graduate Fellowship.

ABSTRACT 

Hybrid Additive Manufacturing (AM) enables functionally graded materials by using secondary processes and energy sources to alter specified locations throughout a build. These secondary processes and energy sources can alter the microstructure, reduce the local average grain size, increase dislocation density, as well as impart or relieve residual stress. These changes in properties are not confined within a single layer but can have possible compounding effects on previous layers. The ability to control the material properties within a localized region of a part provides significant advantages in part design and performance but presents unique challenges in the nondestructive evaluation (NDE) of such parts. In this work, 316 low carbon stainless steel samples were created using laser powder bed fusion (LPBF) with varying milled interlayers as hybrid surface treatments. Ultrasonic responses, i.e., wave speed and backscatter measurements, were used to investigate the sensitivity of such measurements for detection of the interlayer spacing and their variability across a set of samples created with the same build parameters. 

 Keywords: hybrid additive manufacturing, ultrasonic testing

• Date: 10 May 2023
• Time: 10:00 PM UTC to 11:00 PM UTC
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• Los Alamos National Laboratory
• Los Alamos, New Mexico
• United States 87545
• Building: LANL Library
• Room Number: JRO 1/2

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