Fine equiaxed β grains and superior tensile property in Ti–6Al–4V alloy deposited by coaxial electron beam wire feeding additive manufacturing

Jiahua Zhang, Yi Yang, Sheng Cao, Zhiqiang Cao, Dmytro Kovalchuk, Songquan Wu, Enquan Liang, Xi Zhang, Wei Chen, Fan Wu, Aijun Huang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing. This study reports that Ti–6Al–4V alloy fabricated by coaxial electron beam wire feeding additive manufacturing presents a weak anisotropy, high strength and ductility. The superior tensile property arises from a microstructure with fine equiaxed β grains (EGβ), discontinuous grain boundary α phase and short intragranular α lamellae. A large region of fine EGβ arises from a special combination of the temperature gradient and solidification rate, and attractive α morphology is caused by solid phase transformations during interpass thermal cycling and post heat treatments.

Original languageEnglish
Pages (from-to)1311–1320
Number of pages10
JournalActa Metallurgica Sinica (English Letters)
Volume33
Issue number10
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Directed energy deposition
  • Equiaxed β grain
  • Tensile properties
  • Ti–6Al–4V alloy
  • Wire feeding additive manufacturing

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