Spall damage mechanisms in laser powder bed fabricated stainless steel 316L

Koube, Katie D.; Kennedy, Greg; Bertsch, K.; Kacher, Josh; Thoma, D. J.; Thadhani, Naresh N.

doi:10.1016/j.msea.2022.143622

Spall damage mechanisms in laser powder bed fabricated stainless steel 316L

Journal Article · Tue Jul 19 00:00:00 EDT 2022 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2022.143622· OSTI ID:1895150

Koube, Katie D. ^[1]; Kennedy, Greg ^[2]; Bertsch, K. ^[3]; Kacher, Josh ^[2]; Thoma, D. J. ^[4]; Thadhani, Naresh N. ^[2]

Georgia Inst. of Technology, Atlanta, GA (United States); University of Wisconsin-Madison (UW)
Georgia Inst. of Technology, Atlanta, GA (United States)
Univ. of Wisconsin, Madison, WI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)

This paper reports on spall damage mechanisms in laser powder bed fusion (LPBF) fabricated stainless steel 316L (SS316L) subjected to uniaxial, strain plate-impact loading and explores failure evolution with increasing impact velocity and peak pressure. Analysis of velocimetry profiles reveals a heterogeneous failure response with several different failure mechanisms activated during impact and resulting spall. The analysis is supported by optical microscopy and electron backscattered diffraction (EBSD) observation of soft recovered impacted samples, which show evidence of localized nano-twinning, twin growth, severe grain rotation, and grain refinement along the spall plane, in addition to pore nucleation, coalescence, and growth. Furthermore, the observed failure mechanisms, including crack formation and propagation along high angle grain boundaries (HAGBs), are not consistently indicative of ductile fracture typical of wrought stainless steel.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: NA0003921; AC52-07NA27344

OSTI ID:: 1895150

Alternate ID(s):: OSTI ID: 2229593

Report Number(s):: LLNL--JRNL-842500

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 851; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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