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- Title
Microstructural Characterization of the Transition in SS316L and IN625 Bimetallic Fabricated Using Hybrid Additive Manufacturing.
- Authors
Bettencourt, Christopher J.; Kouraytem, Nadia
- Abstract
Nearly all energy technologies utilize heat exchangers and recuperators within the power cycle. To further improve the cost-effectiveness of recuperators, costly high-temperature Inconel 625 superalloy was substituted with a more affordable stainless-steel 316 L to be used at the low-temperature side of the heat exchanger. Bimetallic samples for analysis and examination were fabricated by combining laser powder-bed fusion and directed energy deposition. Two transition strategies for joining to the laser powder-bed fusion steel were explored, namely, a direct transition and an intermediate layer of 50% nickel powder mixed with 50% steel powder through directed energy deposition. The microstructure and chemical composition of the multi-material structures were compared to the single alloy counterparts. Iron-rich regions within the 50/50 transition zone suggest elemental segregation during the deposition of the 50/50 mixed zone. Vickers hardness values measured using micro-indentation are presented across both types of transitions and show a relative lower value in the 50/50 mixed zone.
- Subjects
LASER fusion; LASER deposition; HEAT exchangers; VICKERS hardness; RECUPERATORS; INCONEL; STAINLESS steel
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 12, p5079
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06119-4