Effects of Cr and Fe Addition on Microstructure and Tensile Properties of Ti–6Al–4V Prepared by Direct Energy Deposition

다국어 초록 (Multilingual Abstract)

The effects of Cr and Fe addition on the mechanical properties of Ti–6Al–4V alloys prepared by direct energy depositionwere investigated. As the Cr and Fe concentrations were increased from 0 to 2 mass%, the tensile strength increased becauseof the fine-grained equiaxed prior β phase and martensite. An excellent combination of strength and ductility was obtainedin these alloys. When the Cr and Fe concentrations were increased to 4 mass%, extremely fine-grained martensitic structureswith poor ductility were obtained. In addition, Fe-added Ti–6Al–4V resulted in a partially melted Ti–6Al–4V powder becauseof the large difference between the melting temperatures of the Fe eutectic phase (Ti–33Fe) and the Ti–6Al–4V powder,which induced the formation of a thick liquid layer surrounding Ti–6Al–4V. The ductility of Fe-added Ti–6Al–4V was thuspoorer than that of Cr-added Ti–6Al–4V.

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