About this Abstract |
Meeting |
Advances in Welding and Additive Manufacturing Research 2022
|
Symposium
|
Advances in Welding and Additive Manufacturing Research 2022
|
Presentation Title |
An ICME Approach to Predicting Chemistry and Process Specific Localized Precipitation Behavior During Additive Manufacturing by Linking Finite Element Tools to Computational Thermodynamics |
Author(s) |
Adam T. Hope, Fernando Okigami |
On-Site Speaker (Planned) |
Adam T. Hope |
Abstract Scope |
Predicting localized microstructure in additive manufacturing relies on linking chemistry and processing conditions to microstructure using an integrated computational materials engineering (ICME) approach. In this work, commercially available CALPHAD thermodynamic and finite element analysis (FEA) softwares are used to improve process modeling of additively manufactured builds. Using CALPHAD, thermophysical data (e.g. latent heat, thermal conductivity) are calculated for specific alloy chemistries and used as inputs to a FEA process model. The resulting thermal histories from specific locations in the model are then fed back as inputs to a CALPHAD based kinetic model which predicts precipitation behavior. This framework is applied to evaluate the thermal cycle processing of four different directed energy deposition (DED) processes: wire-arc (WAAM), laser blown-powder (LBP), laser wire (LW) and electron beam deposition (EBD). In all processes evaluated, deposition feedstock is IN718 and the build plate is 316L stainless steel. Build geometries are selected so that specific part locations undergo different thermal cycles resulting in different microstructure and material properties. It is shown that some locations in the build can undergo precipitation of gamma double prime simply as a result of the thermal cycling experienced in the build. This ICME framework, in the context of welding and additive manufacturing, can enable more rapid process parameter development and tailoring of microstructure while accounting for chemistry effects. |
Proceedings Inclusion? |
Undecided |