Influence of solution treatment on microstructure evolution of TC21 titanium alloy with near equiaxed β grains fabricated by laser additive manufacture

Q. Zhang, J. Chen, H. Tan, X. Lin, W. D. Huang

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Laser additive manufacture (LAM) is a novel technique in which metal components can be fabricated layer by layer. In this paper, the effects of solution temperature and cooling rate on microstructure evolution of the LAMed TC21 titanium alloy which containing near equiaxed prior β grains were studied. The LAMed and solution treated samples were investigated by optical microscopy (OM), scanning election microscope (SEM) and X-ray diffractometer (XRD). The results indicate that both the α phase volume fraction and α laths width are affected by the solution temperature and cooling rate. Different microstructure characterization leads to different Vickers hardness values. However, the solution temperatures selected in this study have insignificant effects on the β and α phase texture. The near equiaxed prior β grains exhibits much weaker texture intensity than the typical columnar prior β grains. The comparison of the calculated and measured α phase texture indicates that variant selection occurred during the solution treatment. The martensite α′ phase precipitated during the layer by layer process shows weak variant selection tendency.

Original languageEnglish
Pages (from-to)380-386
Number of pages7
JournalJournal of Alloys and Compounds
Volume666
DOIs
StatePublished - 2016

Keywords

  • Laser additive manufacture
  • Microstructure evolution
  • Near equiaxed grains
  • Solution treatment
  • Titanium alloy

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