High speed synchrotron X-ray diffraction experiments resolve microstructure and phase transformation in laser processed Ti-6Al-4V

Seunghee A. Oh*, Rachel E. Lim, Joseph W. Aroh, Andrew C. Chuang, Benjamin J. Gould, Behnam Amin-Ahmadi, Joel V. Bernier, Tao Sun, P. Chris Pistorius, Robert M. Suter, Anthony D. Rollett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The microstructures of Ti-6Al-4V following laser processing depend primarily on the phase transformation of β to α, but their development is constrained by the rapidly changing temperature in the small fusion zone. In-situ synchrotron X-ray diffraction was utilized to probe the rapid phase evolution in single melt tracks with high angular and temporal resolution. Both fully martensitic and mixed α+α′+β microstructures were confirmed by microscopy. Cooling rates were inferred from the lattice parameter history and complementary thermal simulation. It was found that the threshold cooling rate for fully martensitic transformation is in the range between 2900 and 6500°C/s.

Original languageEnglish (US)
Pages (from-to)429-436
Number of pages8
JournalMaterials Research Letters
Volume9
Issue number10
DOIs
StatePublished - 2021

Keywords

  • in-situ /operando characterization
  • laser melting
  • martensite
  • Ti-6Al-4V
  • X-ray diffraction

ASJC Scopus subject areas

  • General Materials Science

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