| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
|
| Presentation Title |
Microstructural features of additively manufactured 420 stainless steel after isothermal deformation below the Ae1 temperature |
| Author(s) |
Harveen Bongao, Jubert Pasco, Clodualdo Aranas, Kudakwashe Nyamuchiwa |
| On-Site Speaker (Planned) |
Harveen Bongao |
| Abstract Scope |
Tempering is a simple post-printing process that can significantly improve the mechanical properties of LPBF-fabricated 420 stainless steel. In this work, as-printed samples were heat-treated at temperature range 300-600°C for 30 minutes in an argon environment. Phase analysis using XRD and EBSD revealed that the amount of retained/reverted austenite increased with temperature, peaking at 400°C, and decreased to zero at 500 °C. Microstructure analysis showed that the increase in austenite is mainly due to austenite reversion. Formation of reverted austenite became more apparent at 400°C. On the other hand, the retained austenite (i.e., formed after printing) was thermally stable between 300 to 500°C. Tensile test results indicated that the optimum tempering temperature is 400°C. The deformed state microstructure showed that the slight increase in tensile properties of samples tempered at 300°C and 500°C was due to highly stabilized retained austenite, resulting in limited TRIP at higher strains. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Phase Transformations |