High mechanical functionalization of Ti-Al-Cr-Fe-C system alloy for next-generation aircraft applications through microstructural control

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Nakai, Harumi Tsutsumi, Shiro Aki, Yoshio Itsumi, Shogo Murakami, Hideto Oyama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The relationship between microstructures and mechanical properties such as tensile and fatigue properties were systematically investigated by conducting several heat treatments on Ti-4.5Al-4Cr-0.5Fe-0.2C(KS EL-F)and Ti-4.5Al-2Cr-1Fe-0.1(KS EL-F mod)for next-generation aircraft applications. TiC and TiCr2 are formed in KS EL-F and KS EL-F mod annealed at temperatures higher than β -transus and aged at 773 K, respectively. However, the precipitation trends of TiC and TiCr2 are considerably higher in the case of KS EL-F because the amounts of both these precipitates are drastically suppressed in KS EL-F mod even when the heat treatments are identical. As-received KS EL-F and KS EL-Fmod exhibit excellent fatigue strength as compared with annealed Ti-6Al-4V. Although the presence of TiCr2 tends to decrease the fatigue strength, the aged KS EL-F mod exhibits higher fatigue strength than the as-received KS EL-F mod with very low TiCr 2 amounts. Therefore, the aging treatment for KS EL-F mod can be effective in improving the fatigue strength.

Original languageEnglish
Pages (from-to)705-710
Number of pages6
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume61
Issue number12
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • A+β
  • Fatigue properties
  • Tensile properties
  • Type titanium alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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