Effects of alloying elements on nitrogen
diffusion behavior around
TiN/Ti interface α region in as-cast titanium alloys
diffusion behavior around
TiN/Ti interface α region in as-cast titanium alloys
(1. Faculty of Materials and Metallurgical Engineering,
Kunming University of Science and Technology, Kunming 650093, P.R.China；
2. Advanced Materials and Process Engineering Lab,
The University of British Columbia, Vancouver V6T 1N6, Canada)
Kunming University of Science and Technology, Kunming 650093, P.R.China；
2. Advanced Materials and Process Engineering Lab,
The University of British Columbia, Vancouver V6T 1N6, Canada)
Abstract: To characterize the effects of alloying elements on inclusion dissolution of titanium nitride, the content profiles of elements around TiN/Ti boundary α phase regions in liquid titanium alloys have been experimentally carried out. Four kinds of commercial alloys of CpTi, Ti64, Ti17 and Ti6242 containing differentα stabilizing or β-stabilizing elements are examined through artificially embedding the TiN sponge particle into liquid alloys in VAR conditions. The content profiles of nitrogen and alloying elements around TiN/Ti boundary were measured by WDX and microprobe for as-cast samples. The content profiles of nitrogen and alloying elements around N-containing solid in α Ti region of these alloys show a common features of a steep change. In particular, the content profiles of elements for Ti6242 demonstrate unique change of a more gentle change tendency and further deeper into the alloy matrix. The experiment results show that, the differences among composite effects of alloying elements in different alloys within nitrogen-induced diffusion α region result in different dissolution and diffusion behaviors to overcome the α phase region barriers.
Key words: titanium nitride inclusion; content profiles; nitrogen; diffusion