Microstructural development in DED stainless steels: applying welding models to elucidate the impact of processing and alloy composition

Smith, Thale R.; Sugar, Joshua Daniel; San Marchi, Christopher W.; Schoenung, Julie M.

doi:10.1007/s10853-020-05232-y

Title: Microstructural development in DED stainless steels: applying welding models to elucidate the impact of processing and alloy composition

Journal Article · Mon Sep 14 00:00:00 EDT 2020 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-020-05232-y· OSTI ID:1670759

Smith, Thale R. ^[1]; Sugar, Joshua Daniel ^[2]; San Marchi, Christopher W. ^[2]; Schoenung, Julie M. ^[3]

Univ. of California, Davis, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of California, Irvine, CA (United States)

Austenitic stainless steel microstructures produced by directed energy deposition (DED)are analogous to those developed during welding, particularly high energy density welding. To better understand microstructural development during DED, theories of microstructural evolution,which have been established to contextualize weld microstructures, are applied in this study to microstructural development in DED austenitic stainless steels. Phenomenological welding models that describe the development of oxide inclusions, compositional microsegregation, ferrite,matrix austenite grains, and dislocation substructures are utilized to clarify microstructural evolution during deposition of austenitic stainless steels. Two different alloys, 304L and 316L, arecompared to demonstrate the broad applicability of this framework for understanding microstmctural development during the DED process. Despite differences in grain morphology and solidification mode for these two alloys (which can be attributed to compositional differences),similar tensile properties are achieved. It is the fine-scale compositional segregation and dislocation structures that ultimately determine the strength of these materials. The evolution of microsegregation and dislocation structures is shown to be dependent on the rapid solidification and thermomechanical history of the DED processing method and not the composition of the starting material.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

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

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1670759

Report Number(s):: SAND2020-8480J; 689971

Journal Information:: Journal of Materials Science, Vol. 56, Issue 1; ISSN 0022-2461

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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