| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Marine Materials and Structures
|
| Presentation Title |
Process-Microstructure-Property Relationship of Duplex Stainless Steel Deposited via L-DED Process: Build Orientation and Alloying Perspectives |
| Author(s) |
Prayag Burad, Vishal Mahey, Grant Johnson, Peter Collins, Sougata Roy |
| On-Site Speaker (Planned) |
Prayag Burad |
| Abstract Scope |
Austeno-Ferritic Duplex Stainless Steel (DSS) offers excellent mechanical and corrosion resistance, predominantly used in marine and off-shore conditions. Two aspects of Laser Direct Energy Deposition (L-DED) of DSS were explored: build orientation and in-situ versus ex-situ alloying approach and their impact on microstructure and mechanical properties. L-DED samples leveraging bidirectional scan strategy appeared as columnar ferritic, and Grain Boundary Austenite(GBA), Intragranular Austenite(IGA), Widmanstätten Austenite(WA). Energy Backscatter Diffraction(EBSD) results revealed phase distribution of as-deposited samples was nearly ferritic due to the rapid cooling. Microhardness slightly decreased due to increasing IGA. Tensile behavior showed differences in build orientation due to grain boundary hardening. Further, in-situ and ex-situ alloying in DSS using L-DED could successfully control the microstructure. EBSD results indicated drastic effect in resulting phase fraction only by 1wt% Ni addition via in-situ alloying. This can play a crucial role in multi-modal large-scale AM functional parts for future marine applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, |