Difference of microstructure and fatigue properties between forged and rolled Ti-6Al-4V

Yoonseok Lee, Mitsuo Niinomi, Masaaki Nakai, Junko Hieda, Takashi Maeda, Yoshihisa Shirai, Ikuhiro Inagaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In the present study, the effects of the microstructural morphologies of a Ti-6Al-4V (Ti-64) alloy on its fatigue behavior were investigated. Ti-64 bars were subjected to two different thermo-mechanical processing methods. The first sample, referred to as Material-A, had a forged microstructure with the average primary α volume fraction of 44%. The second one, referred to as Material-B, had a hot-rolled microstructure with the average primary α volume fraction of 43%. Fatigue tests were performed on each sample to obtain S-N curves. The microstructure of each sample was observed using an optical microscopy in order to measure the grain sizes of the primary α and secondary α phases. The results of the fatigue tests indicated that Material-B demonstrates better fatigue strength than Material-A. The microstructure of the longitudinal section of each material was also observed to analyze the results of the fatigue tests. The measured diameters and volume fractions of the primary α phases of the two types of materials are similar. On the other hand, the secondary α width of each material is different. It is found that fatigue strength is related to the width of the secondary α phase.

Original languageEnglish
Title of host publicationMaterials Integration
Pages161-165
Number of pages5
Volume508
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011 - Sendai, Japan
Duration: Dec 1 2011Dec 2 2011

Publication series

NameKey Engineering Materials
Volume508
ISSN (Print)10139826

Other

OtherInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011
CountryJapan
CitySendai
Period12/1/1112/2/11

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Keywords

  • Fatigue
  • Forging
  • Primary α
  • Rolling
  • Secondary α
  • Ti-6Al-4V
  • Titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Lee, Y., Niinomi, M., Nakai, M., Hieda, J., Maeda, T., Shirai, Y., & Inagaki, I. (2012). Difference of microstructure and fatigue properties between forged and rolled Ti-6Al-4V. In Materials Integration (Vol. 508, pp. 161-165). (Key Engineering Materials; Vol. 508). https://doi.org/10.4028/www.scientific.net/KEM.508.161