Texture and microstructure characterization in laser additive manufactured Ti-6Al-2Zr-2Sn-3Mo-1.5Cr-2Nb titanium alloy

Qiang Zhang, Jing Chen, Pengfei Guo, Hua Tan, Xin Lin, Weidong Huang

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Laser additive manufacturing (LAM) is a novel manufacturing technique in which metal components can be fabricated layer by layer. In this study, a recently developed damage tolerance titanium alloy TC21 (Ti-6Al-2Zr-2Sn-3Mo-1.5Cr-2Nb) was deposited by LAM process. Texture and microstructure characterization have been investigated by XRD, SEM and EBSD. Prior β grains texture analysis indicates that the (100) poles concentrate in build direction with a texture intensity about 18.7. During cooling down from β phase field, the β to α phase transformation follows the Burger orientation relationship and a pronounced variant selection occurred. Besides, morphology and scale of α phase are quite different along the build direction due to different thermal history. Very fine rib-like α phase with the length less than 2μm and acicular martensite α' can be obtained at the bottom and the top of the sample, respectively. In the middle position, distribution and morphology of α phase is quite uneven and the precipitation sequence of α phase is αGB→αWGB→αWM→αS. The reasons by which they formed are discussed.

Original languageEnglish
Pages (from-to)550-557
Number of pages8
JournalMaterials and Design
Volume88
DOIs
StatePublished - 25 Dec 2015

Keywords

  • Laser additive manufacturing
  • Microstructure characterization
  • Texture
  • Thermal history

Fingerprint

Dive into the research topics of 'Texture and microstructure characterization in laser additive manufactured Ti-6Al-2Zr-2Sn-3Mo-1.5Cr-2Nb titanium alloy'. Together they form a unique fingerprint.

Cite this