engleski

Modeling of elastoplastic behaviour of additive manufactured titanium alloys

Recent advancement of additive manufacturing (AM) technology has brought attention to the problem of insufficient understanding of the mechanical behaviour of additively manufactured metallic materials with polycrystalline microstructure. Material models within which the material at macroscale is considered as a continuum in this case prove insufficient. Therefore, the application and development of material models that consider the size and shape of the grain, orientation of the crystal lattice, size of the melt pool and characteristic pores within the material represent a step forward in modelling of such materials. Titanium alloys are known for their favorable mechanical properties in various applications, such as medical implants, components for aerospace, automotive and process industry. The knowledge on its behavior is very limited, especially if the focus is directed to modeling of the behavior of titanium alloys produced by selective laser melting (SLM). The microstructure of the most researched Ti6Al4V alloy produced by SLM consists predominantly of martensite (α') within long columnar prior β grains, resulting in a high yield strength of about 1000 MPa and a low elongation of less than 10%. The aim of this study is to develop guidelines and recommendations on the properties for the production of SLM-ed titanium alloy samples, as well as references for the development of appropriate material models.

titanium alloy, additive manufacturing, material models

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