A microstructure sensitive model for deformation of Ti-6Al-4V describing Cast-and-Wrought and Additive Manufacturing morphologies. (15th December 2018)

• Record Type: Journal Article
• Authors: Galindo-Fernández, M.A.; Mumtaz, K.; Rivera-Díaz-del-Castillo, P.E.J.; Galindo-Nava, E.I.; Ghadbeigi, H.
• Is Part Of: Materials & design. Volume 160(2018)
• Page Start: 350
• Page End: 362
• Publication Date: 2018-12-15
• Subjects: Modelling -- Ti-6Al-4V -- Additive manufacturing -- Microstructure -- Martensite; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2018.09.028
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Microstructural variations affect deformation response of materials and it is not presented in most of plastic flow prediction models. This work presents a unified description for the deformation response of Ti-6Al-4V (Ti-64) that successfully captures the differences in strength between microstructures produced by conventional cast & wrought routes (C&W) and those obtained by Additive Manufacturing (AM), under various deformation conditions. In the developed model the grain morphology, grain size, phase volume fractions and phase chemical compositions have been linked to the mechanical properties of the studied Ti-64 alloys to predict the effect of processing routes on deformation behaviour of the materials. The model performance has been tested on seven different microstructures from C&W to AM processing routs. It has been found that altering the microstructure greatly affects the yield strength of the tested materials. Additionally, the strength of Ti-64 was found to be mostly affected by the relative volume fraction of α, β and α′, and their respective morphology. The results showed that the model not only successfully predicts the strength of martensitic structures generated through AM but also those obtained by quenching in conventional C&W processing. The findings from this study also suggest that the model could be extended to other titanium alloys within the α + β family. Graphical abstract: Highlights: A new physically-based model has been developed to describe strength and flow stress of AM and Cast-and-wrought build Ti-64 alloys. Microstructural evolution due the thermal exposure should be considered in the model for more accurate prediction at higher temperatures. The proposed model could be used to design new alloys with specific mechanical properties using bespoke microstructural properties.