Influence of annealing treatment on the microstructure, mechanical performance and magnetic susceptibility of low magnetic Zr–1Mo parts manufactured via laser additive manufacturing

Xiaohao Sun, Debao Liu, Minfang Chen, Weiwei Zhou, Naoyuki Nomura, Takao Hanawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In recent years, a low magnetic and fully dense Zr–1Mo (wt%) part was successfully manufactured via the laser powder bed fusion (L-PBF) process, which shows the great potential as metallic biomaterials under the magnetic resonance imaging (MRI) environment. However, due to the high cooling rate after laser incident during the L-PBF process, the as-fabricated Zr–1Mo part consists of a non-equilibrium α′ phase, which contributed to high strength (UTS: 1107 MPa) but insufficient ductility (elongation: 4.3%) for biomedical applications. In order to enhance the mechanical performance of as-fabricated Zr–1Mo parts, various annealing processes that have been recognized as an efficient post-treatment to adjust the mechanical performance of additive manufactured products were executed. After the annealing process, acicular martensite α’ microstructure in as-fabricated Zr–1Mo parts changed to stress relieved/partial relieved acicular α microstructure, basketweave α + β microstructure, lamellar α + β microstructure or retain α+ lamellar α + β microstructure depending on different annealing conditions. In the meantime, elongation increased with increasing holding temperature and residence time, but the tensile strength exhibits a converse trend. The specimens annealed at 873 K, 803 K for 2 h and at 773 K for 8 h possessed UTS of 779 MPa, 964 MPa and 981 MPa as well as elongation of 14.3%, 11.0% and 9.6%, respectively. These annealing conditions could contributed to adequate strength and sufficient ductility, and should be the appropriate annealing conditions for Zr–1Mo parts produced by the L-PBF technology. By comparison with other conventional metallic biomaterials, annealed Zr–1Mo alloy could be applied for the medical devices under MRI environments.

Original languageEnglish
Article number140740
JournalMaterials Science and Engineering A
Volume804
DOIs
Publication statusPublished - 2021 Feb 15

Keywords

  • Annealing process
  • Laser processing
  • Magnetic resonance imaging artifacts
  • Mechanical performance
  • Microstructure
  • Zr–1Mo alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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