|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Phase Field Model Development for Prediction of Microstructure in IN718 Alloy during Additive Manufacturing and Heat Treatment
||Balasubramaniam Radhakrishnan, Ranadip Acharya
|On-Site Speaker (Planned)
Complex microstructures are obtained in multi-component aerospace alloys such as alloy 718 during powder bed laser fusion process. The as-built microstructure is dendritic with segregation of solutes in the inter-dendritic space. A multi-fidelity and multi-scale Bayesian Framework has been used to calibrate parameters for phase field model. The simulations show that the solidification morphology is sensitive to the spacing between the columnar structures. Spacing narrower than a critical value results in continued growth of a columnar microstructure, while above a critical value the columnar structure evolves into a columnar dendritic structure through the formation of secondary arms. These results are discussed in terms of the existing columnar to dendritic transition theories. These alloys require post-processing heat treatment in order to recover the mechanical properties through precipitation hardening. Simulation tools are being developed to predict the precipitation in AM material during post-processing and design a customized heat treatment for the alloy.
||Planned: At-meeting proceedings