Abstracts Book - IMRC 2018

• SE1-O017
Fe EFFECT ON CONTINUOUS COOLING TRANSFORMATION
BEHAVIOR OF Ti-Al-Fe ALLOY
Yong-Taek Hyun 1 , Jong-Woo Won 1
1 Korea Institute of Materials Science, Titanium, Korea.
The effect of iron content on the phase transformation behavior and
microstructure evolution of Ti-Al-Fe alloy during continuous cooling was studied
by dilatometric analysis. The specimens for the studies were heated up to 50°C
higher than the b transus temperature of each alloy at a rate of 50°C/s and then
control cooled at rate of either 75, 20, 7.5, 3, 1, 0.3, 0.1°C/s to room temperature.
It was observed that hardness increased as the Fe content increased during
continuous cooling b transus temperature range to room temperature. This
change in hardness is considered to be closely related to the phase
transformation and precipitation of Ti-Al-Fe alloys. The alloy with an Fe content
of 2.5wt.% or less show a complete martensitic structure at a cooling rate of
75°C/s, but a large amount of b phase remained in the alloy with an Fe content
of 4wt.%. The CCT diagram was constructed by microstructural and dilatometric
analysis of Ti-Al-Fe alloy with Fe content during continuous cooling.
Keywords: Titanium, continuous cooling, phase transformation
Presenting authors email: ythyun@kims.re.kr