| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
| Presentation Title |
Functionally Graded Materials Compositional Path Design Considering Cracking Using Scheil and Equilibrium Simulations |
| Author(s) |
Zhening Yang, Hui Sun, Allison M. Beese, ZI-Kui Liu |
| On-Site Speaker (Planned) |
Zhening Yang |
| Abstract Scope |
Compositionally functionally graded materials (FGMs) are those with spatially varying compositions, and therefore properties. FGMs can be fabricated using direct energy deposition (DED) additive manufacturing (AM) and changing the composition within or between layers. However, due to the high trial-and-error cost and prevalence of cracking when joining dissimilar alloys, the use of thermodynamic simulations to guide the design of FGMs is essential. Here, Scheil simulations were used to predict the amount of brittle deleterious phases in as-built samples to determine compositions to avoid cracking under the solidus temperature. Solidification crack criteria were calculated from the Scheil-calculated temperature versus solid fraction curve to assess solidification crack susceptibility. Additionally, a new method was developed, termed hybrid Scheil-equilibrium simulation, which considers solidification microsegregation leading to possible phase transformation during AM deposition of subsequent layers or post-fabrication heat treatment. The computational approaches and experimental validation using four FGM systems will be presented. |