On the role of cooling rate and temperature in forming twinned α’ martensite in Ti–6Al–4V

Sheng Cao, Bohua Zhang, Yi Yang, Qingbo Jia, Lei Li, Shewei Xin, Xinhua Wu, Qiaodan Hu, Chao Voon Samuel Lim

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3 Citations (Scopus)

Abstract

Quenching experiments having different cooling rates up to 1.6 × 104 ˚C/s were applied on rolled Ti–6Al–4V sheets. Twins were not observed in the condition with a low cooling rate. With an increased quenching rate to the order of 104 ˚C/s, {101¯1} twins were formed in the temperature range of 550–850 °C, and {101¯2} twins were activated at an even lower temperature range. These observations offer insights into the mechanism of twinned martensite formation for selective laser melted Ti–6Al–4V by considering the alternating thermal stress and fast cooling from decreasing peak temperatures in selective laser melting thermal cycles.

Original languageEnglish
Article number152247
Number of pages5
JournalJournal of Alloys and Compounds
Volume813
DOIs
Publication statusPublished - 15 Jan 2020

Keywords

  • Quenching
  • Titanium alloys
  • Transmission electron microscopy
  • Twinning

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