Journal
MATERIALS LETTERS
Volume 216, Issue -, Pages 16-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.12.129
Keywords
Functionally graded materials; Additive manufacturing; LENS (TM); Magnetic/nonmagnetic; SS430; SS316
Funding
- Joint Center for Aerospace Technology Innovation (JCATI, Seattle, WA)
- National Science Foundation [NSF-CMMI 1538851]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1538851] Funding Source: National Science Foundation
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Fabrication of compositionally-graded magnetic-nonmagnetic bimetallic structures was successfully completed using a laser engineered net shaping (LENSTM) system. A graded magnetic functionality was implemented by directly transitioning from non-magnetic austenitic stainless steel 316 (SS316) to magnetic ferritic stainless steel 430 (SS430) in a single structure. LENS (TM) additive manufacturing utilizes a high-powered laser to continuously melt and bond metallic powder in successive layers to create the 3D structure. Microstructures revealed a preferred grain growth direction at the interfaces of the deposited layers. Micro-hardness values across the part's cross-section exhibited a smooth transition from the highest value of 266 +/- 4 HV in the SS430 region to the lowest value at the SS316 substrate of 174 +/- 3 HV. Magnetic functionality was observed on the SS430 side of the bimetallic structure, showing how LENS (TM) can additively combine materials of varying compositions for location-specific functionality. (C) 2017 Elsevier B.V. All rights reserved.
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