Fatigue characteristics of dental cast titanium alloy, Ti-6Al-7Nb, conducted with thermochemical heat processing

Toshikazu Akahori, Mitsuo Niinomi, Akihiro Suzuki

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Fatigue limits of cast Ti-6Al-7Nb and Ti-6Al-4V, which have been subjected to hot-isostatic-pressing (HIP) treatment after casting (as-HIP'ed cast alloys), conducted with thermochemical treatments, which are usual thermochemical processing (THP) and THP combined with a post treatment (THPH), improve about 40% as compared with those of as-HIP'ed cast alloys. Fatigue crack initiation and small fatigue crack propagation resistance of HIP'ed cast Ti-6Al-7Nb and Ti-6A1-4V conducted with THP and THPH improve remarkably as compared with those of both as-HIP'ed cast alloys because the effective slip length under the cyclic stress decreases due to refined microstructure by THP and THPH, and then the slips occur uniformly. Fatigue crack initiation and small fatigue crack propagation lives of HIP'ed cast Ti-6Al-7Nb and Ti-6Al-4V conducted with THP and THPH are around 80-90% of the total fatigue lives. They increase twice as much as those of both as-HIP'ed cast alloys (i.e. around 40%).

Original languageEnglish
Pages (from-to)3073-3078
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number4
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11

Keywords

  • Crack initiation
  • Small crack propagation and fatigue life
  • Titanium-6aluminium-4vanadium
  • Titanium-6aluminium-7niobium

ASJC Scopus subject areas

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

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