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.
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
Materials Science and Engineering
Mechanical and Aerospace Engineering
Intelligent Systems Center
Keywords and Phrases
17-4 PH; Additive Manufacturing; Nitrogen Absorption
International Standard Serial Number (ISSN)
Article - Journal
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01 Feb 2021