Additive manufacturing of functionally graded transition joints between ferritic and austenitic alloys

Zuback, J. S.; Palmer, T. A.; DebRoy, T.

doi:10.1016/j.jallcom.2018.08.197

Title: Additive manufacturing of functionally graded transition joints between ferritic and austenitic alloys

Journal Article · Wed Aug 22 00:00:00 EDT 2018 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2018.08.197· OSTI ID:1613870

Zuback, J. S. ^[1]; Palmer, T. A. ^[1]; DebRoy, T. ^[1]

Pennsylvania State University, University Park, PA (United States)

Dissimilar metal joints between ferritic and austenitic alloys are susceptible to premature failure due to diffusive carbon loss from the ferritic alloy driven by abrupt changes in carbon chemical potential. Compositional grading of transition joints fabricated using laser-based directed energy deposition additive manufacturing offers a means for limiting carbon diffusion. In this report we fabricate functionally graded transition joints between a ferritic and austenitic alloy, characterize spatial variations of chemical composition, microstructure and hardness, and test their effectiveness to limit carbon loss from the ferritic alloy. Microstructural studies and carbon potential variations in the functionally graded material showed that the length of the joints can be shorter, and there is no benefit to continue compositional grading once the microstructure becomes fully austenitic. Since dissimilar joints have an expected lifetime of several decades, long service times were simulated through accelerated heat treatment experiments at elevated temperatures for both a dissimilar metal weld and a functionally graded transition joint. While the dissimilar weld showed pronounced carbon loss from the ferritic side, there was insignificant change in the carbon concentration profile in the functionally graded joint indicating effectiveness of the graded joints to perform under service conditions.

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Research Organization:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); USDOE

Grant/Contract Number:: NE0008280

OSTI ID:: 1613870

Alternate ID(s):: OSTI ID: 1703724

Journal Information:: Journal of Alloys and Compounds, Vol. 770, Issue C; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 63 works

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36 MATERIALS SCIENCE
ferritic and austenitic alloys
laser additive manufacturing
diffusion
functionally graded materials
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