About this Abstract |
| Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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| Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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| Presentation Title |
Effect of Peening Temperature on Microstructure in WAAM-Fabricated Stainless Steels |
| Author(s) |
Shramana Ghosh, Miguel Hoffmann, David Hebble, Mario Rodriguez Parra, Christopher Fancher, Brian Post, Soumya Nag, Adam Stevens, Thomas Feldhausen |
| On-Site Speaker (Planned) |
Shramana Ghosh |
| Abstract Scope |
Wire Arc Additive Manufacturing (WAAM) process often results in coarse, columnar grain structures that affect mechanical performance. This study examines the effect of peening temperature on microstructural evolution in two stainless steels—316L (austenitic) and 410NiMo (martensitic)—using interlayer hammer peening. Thin-walled structures were built via Gas Metal Arc Welding (GMAW) and subjected to four conditions: as-deposited, room temperature (RT), intermediate temperature (IT, 350–390 °C), and high temperature (HT, 740–880 °C) peening.
Results show that elevated-temperature peening significantly altered wall geometry, increasing width and decreasing layer height. Peening at HT led to more refined, equiaxed grains and reduced texture intensity in 316L, along with increased microhardness (197 HV vs. 178 HV in as-deposited regions). For 410NiMo, both HT and IT peening conditions promoted grain refinement, but no hardness improvements. These findings demonstrate that thermally assisted interlayer peening is an effective strategy for microstructural control in WAAM. |
| Proceedings Inclusion? |
Planned: Post-meeting proceedings |