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Metals 2018, 8(8), 633;

Modeling of Microstructure Evolution of Ti6Al4V for Additive Manufacturing

International Center for Numerical Methods in Engineering (CIMNE), Universidad Politécnica de Cataluña (UPC), Edificio C1, Campus Norte, Gran Capitán s/n, 08034 Barcelona, Spain
Author to whom correspondence should be addressed.
Received: 14 June 2018 / Revised: 1 August 2018 / Accepted: 6 August 2018 / Published: 10 August 2018
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AM processes are characterized by complex thermal cycles that have a deep influence on the microstructural transformations of the deposited alloy. In this work, a general model for the prediction of microstructure evolution during solid state transformations of Ti6Al4V is presented. Several formulations have been developed and employed for modeling phase transformations in other manufacturing processes and, particularly, in casting. The proposed model is mainly based on the combination and modification of some of these existing formulations, leading to a new overall model specifically dedicated to AM. The accuracy and suitability of the integrated model is enhanced, introducing new dedicated features. In fact the model is designed to deal with fast cooling and re-heating cycles typical of AM processes because: (a) it is able to consider incomplete transformations and varying initial content of phases and (b) it can take into account simultaneous transformations.The model is implemented in COMET, an in-house Finite Element (FE)-based framework for the solution of thermo-mechanical engineering problems. The validation of the microstructural model is performed by comparing the simulation results with the data available in the literature. The sensitivity of the model to the variation of material parameters is also discussed. View Full-Text
Keywords: additive manufacturing; metal deposition; process simulation; microstructure modeling; Ti6Al4V additive manufacturing; metal deposition; process simulation; microstructure modeling; Ti6Al4V

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Salsi, E.; Chiumenti, M.; Cervera, M. Modeling of Microstructure Evolution of Ti6Al4V for Additive Manufacturing. Metals 2018, 8, 633.

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