The influence of 0.2wt-%C carbon on the ageing response of Ti-15-3

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Authors

Abstract

The effect of aging time and temperature on the microstructure and mechanical properties of Ti-15-3 (Ti-3Cr-3Sn-3Al) with and without carbon addition has been studied. It has been found that carbon addition has a significant effect on the age hardenability and microstructural stability at higher aging temperatures in Ti-15-3, whereas it has a smaller effect at lower aging temperatures, where precipitation of omega appears to influence precipitation of alpha. The presence of carbides in Ti-15-3 accelerates the precipitation and inhibits the growth of a phase. The gettering of oxygen by the Ti2C precipitates reduces the tendency of grain boundary alpha precipitation and improves the homogeneity of alpha precipitation. The significance of these observations is discussed in terms of the effect of the microstructural changes in quenched and aged samples associated with the presence of Ti2C precipitates.

Details

Original languageEnglish
Pages (from-to)756-763
Number of pages8
JournalMaterials Science and Technology
Volume20
Publication statusPublished - 1 Jun 2004

Keywords

  • titanium alloy Ti-15-3, precipitation hardening, microstructure, mechanical properties