MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||6|
|Published online||12 October 2020|
Effect of microstructure on tensile properties of Ti-17 alloys forged using a 1500-ton forging simulator
a National Institute for Materials Science, Tsukuba, Japan
b Kagawa University, Takamatsu, Japan
c Institute for Materials Research, Tohoku University, Sendai, Japan
d Faculty of engineering and graduate school of engineering, Gifu University, Gifu, Japan
e Department of Science and Technology, Meijo University, Nagoya, Japan
f Department ofMaterials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan.
g Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan.
h Kobe Steel, LTD., Takasago, Japan
Microstructure dependence on mechanical properties were investigated for Ti-17 forged at temperatures between 700 and 850 ˚C with deformation ratio from 33 to 80 %, and solutiontreated at 800˚C for 4 hours and aged at 620 ˚C for 8 hours. The microstructure was observed after solution and aging treatments. The volume fraction and the size of the primary alpha phase was controlled by solution treatment temperature, not forging temperature and deformation ratio. Forging temperature affected the morphology of grain boundary (GB) alpha phase. Deformation ratio affected the grain size and the aspect ratio of the horizontal and vertical grain size of the prior beta phase. The tensile strength was investigated at room temperature, 450, and 600 ˚C. Forging temperature and deformation ratio did not affect the tensile strength because there is no large difference of the volume fraction of the alphaphase. On the other hand, the elongation and the reduction of area increased with increase of the aspect ratio of the prior beta grains; that means, increase of the deformation ratio. Raising of forging temperature also increased elongation and reduction of area due to the film-like GB alphaphase.
© The Authors, published by EDP Sciences, 2020
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