About this Abstract |
| Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
| Symposium
|
Special Session
|
| Presentation Title |
In-situ Microstructural Transformations in Wire-arc Additively Manufactured Maraging 250-grade Steel |
| Author(s) |
Yao Xu, Brajendra Mishra, Sneha Prabha Narra |
| On-Site Speaker (Planned) |
Sneha Prabha Narra |
| Abstract Scope |
Wire arc additive manufacturing has recently garnered interest due to near-net-shaped manufacturing of large-scale components because of higher deposition rates and lower feedstock costs. Meanwhile, there is also temperature build-up during layer-by-layer fabrication that can result in defects and microstructural transformations. Hence, it is critical to assess the impact of thermal cycles and heat accumulation on the as-fabricated microstructure and properties. In this work, microstructure characterization of Maraging Steel 250 thin-wall parts was performed to explain the change in hardness with wall height. The influence of processing parameters, such as interlayer dwell time, on grain/martensite block size, tempered martensite, and precipitation was compared. In addition, the thermal history of each layer was estimated using a conduction-based heat transfer model to explain the observed microstructure. This work establishes a comprehensive understanding of the effect of thermal cycles and heat accumulation on microstructure evolution in wire arc additively manufactured Maraging Steel 250. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |