Effect of heat treatment and deformation on the microstructure and mechanical properties of SP-700 titanium alloy

Jo Kuang Nieh, Sheng Long Lee, Kuen Sung Pan

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates the effects of cold working prior to aging on the microstructure and mechanical properties of SP-700 titanium alloy. The results indicate that the microstructure of the quenched alloy comprises blocky primary α, retained β, and acicular a" martensite distributed in the β matrix. The retained β is transformed to denser and finer brittle acicular martensite α" by stress-induced martensitic transformation and the quantity of retained b decreases with higher degrees of cold working. The quenched alloy exhibits not only low yield strength, but the stress-induced martensite leads to a distinct increase in strength with good ductility. Plastic deformation prior to the aging treatment produces a great increase in the yield strength due to refinement of the precipitate microstructure, leading to the ratio of strength increment and ductility being very low.

Original languageEnglish
Pages (from-to)1224-1229
Number of pages6
JournalInternational Journal of Materials Research
Volume106
Issue number12
DOIs
StatePublished - Dec 2015

Keywords

  • Deformation
  • Mechanical properties
  • Microstructure
  • SP-700 titanium alloy
  • Stress-induced martensite

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