Step Aging of a Sintered Ti-13 mass%Cr β Alloy

DOI Web Site 9 References Open Access
  • Takaki Setsuo
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Ikeda Yasuyuki
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Sugaya Kouji
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

Bibliographic Information

Other Title
  • Step Aging of a Sintered Ti-13 mass%Cr β Alloy

Search this article

Description

The behavior of recovery of ω and transition from ω to α was investigated by means of hardnesss testing, tensile testing and microstructural examinations in a Ti-13 mass%Cr alloy produced by powder metallurgy. Sintered materials were subjected to the solution treatment of 1273 K-1.8 ks followed by water quenching, in advance. Age-hardening by ω precipitation is most significant in the aging at around 623 K, and hardness reaches the maximum after 3 ks aging at 623 K. Age-hardened specimens undergo softening during secondary aging at temperatures above 623 K (step aging) due to recovery of ω. When the secondary aging temperature is higher than 823 K, hardness of pre-aged specimens drops to that of as solution-treated materials, because all of ω can completely recover. In the intercritical temperatures between 623 K and 823 K, however, a part of ω retains and provides the nuclei for α precipitation. This results in a fine dispersion of α and a great increase in tensile strength of the alloy with step aging.

Journal

References(9)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top