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The Korean Institute of Metals and Materials (대한금속재료학회)
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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))
  • Received : 2018.04.17
  • Accepted : 2018.05.15
  • Published : 2018.11.20
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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

Acknowledgement

Supported by : Ministry of Trade, Industry and Energy

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