| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Microstructure Evolution in Laser Deposited AISI 420 Stainless Steel: Effect of Post-processing Heat Treatment |
| Author(s) |
Madhavan Radhakrishnan, Md Mehadi Hassan, David Otazu, Thomas Lienert, Osman Anderoglu |
| On-Site Speaker (Planned) |
Madhavan Radhakrishnan |
| Abstract Scope |
AISI 420 martensitic stainless steels (0.4%C, 12.7%Cr, in wt.%) were successfully deposited onto 316L substrate by Laser Engineered Net Shaping (LENSŪ) process. The process produced a near-fully dense deposit (99.5% relative density). The cross-sectional examination by electron microscopy and XRD confirms dual-phase microstructure of martensitic needles and austenite. Phase fraction calculations show that near the substrate and top of the build, the microstructure is almost martensite and the austenite area fraction is about 2%. The austenite fraction peaks to about 20% at the center of the build. The observed microstructure gradient is attributed to the repeated heating cycles and fast cooling rates of the individual build layers. Preliminary mechanical characterization by micro-Vickers hardness tests shows uniform hardness trend across the build. The talk would explore the effects of processing heat input and post-processing heat treatment conditions on the evolution of local chemistry, phase transformation, and mechanical performance of 420 steel. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |