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Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb
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Beijing Municipal Science and Technology Project (D13110400300000)

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    Abstract:

    The Ti-based components were synthesized via electron beam selective melting (EBSM) using blended pre-alloyed powders of Ti6Al4V and Ti45Al7Nb with a mass ratio of about 1:1. The microstructures and the chemical compositions of EBSM component samples were investigated by optical microscopy (OM), scanning electronic microscopy (SEM), electron probe micro-analyzer (EPMA) and X-ray diffraction (XRD). The results indicate that an increase of energy density leads to a decrease of fusion defects and an increase of density of the samples. The macro-structure consists of two regions, the martensite phase region and α2+β phase region. The martensite phase is formed due to the rapid solidification, while the reheating cycles have a remarkable effect on the formation of α2+β phase. The micro-hardness of martensite region is significantly higher than that of α2+β phase region. Due to the discontinuous distribution of thick platelet α2 phase along grain boundaries and the high coordinating deformation capability of equiaxial α2 phase, the samples have a tensile strength up to 1214.3 MPa, and a large elongation of 18%.

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[Ge Wenjun, Guo Chao, Lin Feng. Microstructures of Components Synthesized via Electron Beam Selective Melting Using Blended Pre-Alloyed Powders of Ti6Al4V and Ti45Al7Nb[J]. Rare Metal Materials and Engineering,2015,44(11):2623~2627.]
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History
  • Received:October 14,2014
  • Revised:
  • Adopted:
  • Online: July 29,2016
  • Published: