Grain Refinement of Titanium Weld by Heterogeneous Nucleation
Microstructure formation of CP-Ti and TiB reinforced titanium were in-situ observed during the thermal cycle simulated for Tungsten Inert Gas (TIG) welding, by using laser scanning confocal microscopy. Under the in-situ observation of TiB reinforced titanium, heterogeneous nucleation of α-phase at inclusion was clearly detected and plate growth was shown in high timeresolution. Furthermore, it was observed that grain boundary of β -phase was pinned by the inclusions. Microstructure difference between pure and TiB reinforced titanium was explained based on those in-situ observations.
Changhee Lee, Jong-Bong Lee, Dong-Hwan Park and Suck-Joo Na
H. Terasaki et al., "Grain Refinement of Titanium Weld by Heterogeneous Nucleation", Materials Science Forum, Vols. 580-582, pp. 21-24, 2008