Complementary Measurements of Residual Stresses Before and After Base Plate Removal in an Intricate Additively-Manufactured Stainless-Steel Valve Housing

Clausen, Bjorn; D'elia, C. R.; Prime, Michael Bruce; Hill, Michael R.; Bishop, J. E.; Johnson, K. L.; Jared, B. H.; Allen, K. M.; Balch, D. K.; Roach, A.; Brown, Donald William

doi:10.1016/j.addma.2020.101555

Complementary Measurements of Residual Stresses Before and After Base Plate Removal in an Intricate Additively-Manufactured Stainless-Steel Valve Housing

Journal Article · Mon Aug 24 00:00:00 EDT 2020 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2020.101555· OSTI ID:1659202

^[1]; D'elia, C. R. ^[2]; ^[1]; Hill, Michael R. ^[2]; Bishop, J. E. ^[3]; Johnson, K. L. ^[3]; Jared, B. H. ^[3]; Allen, K. M. ^[4]; Balch, D. K. ^[3]; Roach, A. ^[3]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, Davis, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Residual stress measurements using neutron diffraction and the contour method were performed on a valve housing made from 316 L stainless steel powder with intricate three-dimensional internal features using laser powder-bed fusion additive manufacturing. The measurements captured the evolution of the residual stress fields from a state where the valve housing was attached to the base plate to a state where the housing was cut free from the base plate. Making use of this cut, thus making it a non-destructive measurement in this application, the contour method mapped the residual stress component normal to the cut plane (this stress field is completely relieved by cutting) over the whole cut plane, as well as the change in all stresses in the entire housing due to the cut. The non-destructive nature of the neutron diffraction measurements enabled measurements of residual stress at various points in the build prior to cutting and again after cutting. Good agreement was observed between the two measurement techniques, which showed large, tensile build-direction residual stresses in the outer regions of the housing. The contour results showed large changes in multiple stress components upon removal of the build from the base plate in two distinct regions: near the plane where the build was cut free from the base plate and near the internal features that act as stress concentrators. These observations should be useful in understanding the driving mechanisms for builds cracking near the base plate and to identify regions of concern for structural integrity. Neutron diffraction measurements were also used to show the shear stresses near the base plate were significantly lower than normal stresses, an important assumption for the contour method because of the asymmetric cut.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1659202

Alternate ID(s):: OSTI ID: 1761228
OSTI ID: 1670764

Report Number(s):: LA-UR--19-29442

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 36; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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