About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Environmental Degradation of Additively Manufactured Alloys
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Presentation Title |
Melt Pool Boundaries and the Corrosion of Laser Powder Fusion Stainless Steels |
Author(s) |
Eric Schindelholz, Michael Melia, Christopher Barr, Bradley Jared, Jeffrey rodelas, Paul Kotula |
On-Site Speaker (Planned) |
Eric Schindelholz |
Abstract Scope |
The nature of melt pool boundaries (MPBs) in additively manufactured alloys are characteristically delineated by differences in grain or subgrain orientation, size and morphology. They may also possess more subtle attributes, such as enrichment of secondary phases or non-uniform residual stresses, which have yet to be fully realized. Several groups have recently reported that MBPs in selective laser melted (SLM) stainless steels suffer considerable localized attack under certain oxidizing and acidic conditions. This behavior has been attributed to secondary phases, pores or non-uniformities in residual stress at the MPB, but without definitive evidence. Here we present electrochemical and detailed electron microscopy results that evidence the characteristics and origin of MPB susceptibility in SLM austenitic stainless steels. The implications of these results along with mitigation strategies, including heat treatment, will also be addressed.
SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. SAND2020-7397 A. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Environmental Effects |