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http://dx.doi.org/10.1007/s12540-018-0148-x

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

Byun, Yool (Advanced Metals Division, Titanium Alloys Department, Korea Institute of Materials Science (KIMS))
Lee, Sangwon (Advanced Metals Division, Titanium Alloys Department, Korea Institute of Materials Science (KIMS))
Seo, Seong-Moon (High Temperature Materials Center, Korea Institute of Materials Science (KIMS))
Yeom, Jong-taek (Advanced Metals Division, Titanium Alloys Department, Korea Institute of Materials Science (KIMS))
Kim, Seung Eon (Advanced Metals Division, Titanium Alloys Department, Korea Institute of Materials Science (KIMS))
Kang, Namhyun (Department of Materials Science and Engineering, Pusan National University)
Hong, Jaekeun (Advanced Metals Division, Titanium Alloys Department, Korea Institute of Materials Science (KIMS))
Publication Information
Metals and materials international / v.24, no.6, 2018 , pp. 1213-1220 More about this Journal
Abstract
The effects of Cr and Fe addition on the mechanical properties of Ti-6Al-4V alloys prepared by direct energy deposition were investigated. As the Cr and Fe concentrations were increased from 0 to 2 mass%, the tensile strength increased because of the fine-grained equiaxed prior ${\beta}$ phase and martensite. An excellent combination of strength and ductility was obtained in these alloys. When the Cr and Fe concentrations were increased to 4 mass%, extremely fine-grained martensitic structures with poor ductility were obtained. In addition, Fe-added Ti-6Al-4V resulted in a partially melted Ti-6Al-4V powder because of 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 thus poorer than that of Cr-added Ti-6Al-4V.
Keywords
Ti-6Al-4V alloy; Alloying elements; Strengthening; Partially melted powder; Direct energy deposition;
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