SOLICITATION NOTICE
A -- Additive Manufacturing (AM) Capability Development � Production of Fine-Grained, Isotropic Microstructures in Gas Metal Arc- Directed Energy Deposition (GMA-DED)
- Notice Date
- 5/25/2023 10:57:35 AM
- Notice Type
- Solicitation
- NAICS
- 541715
— Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
- Contracting Office
- FLUOR MARINE PROPULSION - DOE CONTRACTOR Schenectady NY 12301 USA
- ZIP Code
- 12301
- Solicitation Number
- FMP-NNL-0030
- Response Due
- 6/29/2023 2:00:00 PM
- Archive Date
- 06/29/2023
- Point of Contact
- General Email
- E-Mail Address
-
ATIP@unnpp.gov
(ATIP@unnpp.gov)
- Description
- The Naval Nuclear Laboratory (NNL) is seeking methods capable of producing fine-grained, isotropic microstructures in gas metal arc-directed energy deposition (GMA-DED) additive manufacturing (AM) builds. �This capability is of interest to enhance material properties and ultrasonic inspection ability. �The long dendritic grains in welds and GMA-DED builds are challenging for ultrasonic waves to penetrate (and penetration is direction-dependent), which could limit widespread use of the GMA-DED AM technique for use of engineering components. �Large grains can lead to lower than desired yield strength as well as direction-dependent properties such as strength, ductility, and fatigue resistance. � Approaches have been reported in the literature to promote fine-grained and isotropic microstructures in welds and GMA-DED builds. �Applying force through peening, rolling, or other means can promote recrystallization during subsequent passes or layers. �Use of magnetic or ultrasonic means to �stir� the weld pool and disrupt formation of large dendrites or grains has also been studied. �Addition of second phase particles to promote nucleation of dendrites or grains is another method that has been studied. �These or other methods are of interest if they can be successfully applied to promote fine-grained and isotropic microstructures in GMA-DED builds and welds. � NNL is interested in methods that can (eventually) be applied for engineering scale parts in a production environment, not solely for use on demonstration-sized specimens in a laboratory (though proof of concept work on smaller builds in a laboratory are of interest for initial phases of a project). Considerations of interest include repeatability and reliability of the method, plus any impacts on build productivity and cost. �Materials of primary interest are Type 316L stainless steel or Alloy 625 though developmental work on other materials is of interest. �NNL is interested in proposed solutions that can 1) prove the concept of an approach, 2) produce isotropic and fine-grained material verified through microstructure studies, 3) be scaled to engineering sized parts to follow. �In addition, the material properties for builds employing the proposed solution must be tested in multiple orientations to demonstrate effects on strength, ductility, and ultrasonic wave propagation. � �
- Web Link
-
SAM.gov Permalink
(https://sam.gov/opp/c252ed233b4e43389f9885dea8f08193/view)
- Place of Performance
- Address: USA
- Country: USA
- Country: USA
- Record
- SN06694230-F 20230527/230525230110 (samdaily.us)
- Source
-
SAM.gov Link to This Notice
(may not be valid after Archive Date)
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