About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
A Comparative Study on the Microstructure and Texture Evolution of L-PBF and LP-DED 17-4 PH Stainless Steel during Heat Treatment |
Author(s) |
Pooriya Nezhadfar, Paul R. Gradl, Shuai Shao, Nima Shamsaei |
On-Site Speaker (Planned) |
Pooriya Nezhadfar |
Abstract Scope |
This study aims to characterize the microstructure and crystallographic texture of 17-4 PH stainless steel (SS) manufactured via laser directed energy deposition (L-DED) and laser powder bed fusion (L-PBF), in both non-heat treated and heat treated conditions. It is found that the non-heat treated L-DED 17-4 PH SS possesses coarse columnar ferrite grains decorated with Widmanestatten ferrite grains, whereas the L-PBF counterpart has very fine and mostly equiaxed ferrite grains along with lath martensite. An identical stress relief (SR) temperature is obtained for both the L-PBF and L-DED 17-4 PH SS specimens based on the phase diagrams generated using Thermo-Calc. software. The SR step prior to CA-H1025 heat treatment resulted in texture weakening, and refined the grain structure to some extent. The non-heat treated L-PBF 17-4 PH SS specimen possesses strong cube and γ-fiber textures, while the texture transfers to a weaker γ-fiber components after performing CA-H1025 heat treatment. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |