| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Understanding the effect build orientation and alloying strategy in microstructure and mechanical behavior of laser metal deposited Duplex stainless steel |
| Author(s) |
Prayag Burad, Vishal Mahey, Sougata Roy |
| On-Site Speaker (Planned) |
Prayag Burad |
| Abstract Scope |
Microstructure of Duplex Stainless Steel (DSS) combines austenite-ferrite phase fractions resulting excellent strength and corrosion resistance in marine and off-shore environments. Two aspects of Laser Direct Energy Deposition (L-DED) of DSS were explored: build orientation and in-situ versus ex-situ alloying followed by 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, alloying approach in DSS using L-DED could successfully control the phase fractions and microstructure. EBSD results indicated drastic effect in resulting phase fraction with altering nickel addition via in-situ and ex-situ alloying. This can play a crucial role in multi-modal large-scale AM functional parts for future marine applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |