Influence of heat treatment on microstructure of laser solid forming Ti-6.5Al-3.5Mo-1.5Zr-0.25Si alloys

Yu Huang, Jing Chen, Fengying Zhang, Xin Lin, Weidong Huang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The as-deposited microstructure and heat-treated microstructure of Ti-6.5Al-3.5Mo-1.5Zr-0.25Si alloys (TC11) by Laser Solid Forming (LSF) were compared, and approaches to improve LSF microstructure and high-temperature combination properties of TC11 alloys were researched. Results show the as-deposited microstructure of TC11 alloy consists of coarse columnar grains and equiaxed grains throughout cladding layers, and the prior columnar β-Ti grains are composed of lathlike α and residual β. The microstructure of as-deposited samples after 950°C heat treatment is a similar triplex mixture of equiaxed α, basketweave α lath and transformed β. The majority of continuous prior α boundary is broken, and become spheroidized and illegible; α laths grow up to bunch on some unbroken boundary; the equiaxed α in coarse β grains is related with subgrains. The microstructure after heat treated at 970°C is a certain basketweave structure consisting of a few equiaxed-α and α laths which have coarsening tendency; the microstructure after recrystallization at 1030°C followed by 950°C heat treatment is typical Widmanstätten structure consisting of coarse α laths, and lots of β-Ti is found to separate out inside α and on α boundaries without breaking basically.

Original languageEnglish
Pages (from-to)2146-2150
Number of pages5
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume38
Issue number12
StatePublished - Dec 2009

Keywords

  • Heat treatment
  • Laser solid forming
  • Microstructure
  • TC11 titanium alloy

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