Stir zone microstructure of commercial purity titanium friction stir welded using pcBN tool

Yu Zhang, Yutaka Sato, Hiroyuki Kokawa, Seung Hwan C. Park, Satoshi Hirano

Research output: Contribution to journalArticlepeer-review

104 Citations (Scopus)

Abstract

In the present study, friction stir welding was applied to commercial purity titanium using a polycrystalline cubic boron nitride tool, and microstructure and hardness in the weld were examined. Additionally, the microstructural evolution during friction stir welding was also discussed. The stir zone consisted of fine equiaxed α grains surrounded by serrate grain boundaries, which were produced through the β → α allotropic transformation during the cooling cycle of friction stir welding. The fine α grains caused higher hardness than that in the base material. A lath-shaped α grain structure containing Ti borides and tool debris was observed in the surface region of the stir zone, whose hardness was the highest in the weld.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalMaterials Science and Engineering A
Volume488
Issue number1-2
DOIs
Publication statusPublished - 2008 Aug 15

Keywords

  • Allotropic transformation
  • Commercial purity titanium
  • Friction stir welding
  • Microstructure
  • pcBN

ASJC Scopus subject areas

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

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