Abstract
In the fabrication of 17-4 PH by laser powder bed fusion (L-PBF) the well-documented occurrence of large amounts of retained austenite can be attributed to an elevated concentration of nitrogen present in the material. While the effects of continuous wave (CW) laser processing on in-situ nitrogen absorption characteristics have been evaluated, power modulated pulsed wave (PW) laser processing effects have not. In this study the effects of PW L-PBF processing of 17-4 PH on nitrogen absorption, phase composition, and mechanical performance are explored using commercially available PW L-PBF equipment and compared to samples produced by CW L-PBF. PW L-PBF samples fabricated in cover gas conditions with varying amounts of nitrogen demonstrated reduced absorption levels compared to those produced by CW L-PBF with no effects on phase composition and minimal effects on mechanical performance.
Recommended Citation
B. Brown et al., "Absorption of Nitrogen during Pulsed Wave L-PBF of 17-4 PH Steel," Materials, vol. 14, no. 3, article no. 560, MDPI, Feb 2021.
The definitive version is available at https://doi.org/10.3390/ma14030560
Department(s)
Materials Science and Engineering
Second Department
Mechanical and Aerospace Engineering
Research Center/Lab(s)
Intelligent Systems Center
Keywords and Phrases
17-4 PH; Additive Manufacturing; Nitrogen Absorption
International Standard Serial Number (ISSN)
1996-1944
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2021 The Authors, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
01 Feb 2021
Comments
This work was funded by the Department of Energy’s Kansas City National Security Campus, which is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.