Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5456680 | Materials Science and Engineering: A | 2016 | 7 Pages |
Abstract
The effect of process variables on flow response and microstructure evolution during high velocity deformation of Ti-17 with a colony alpha preformed microstructure was established using the Split Hopkinson Pressure Bar (SHPB). The testing was conducted on samples with prior-beta grain sizes of 400 μm at strain rates of 2000-6000 sâ1, test temperatures of 293-973 K. All flow curves exhibited a peak stress followed by a moderate flow softening which can be rationalized by the occurrence of the adiabatic shearing band (ASB) in this alloy. The ASBs could be divided into two types, “white” ASBs (deformation band) and “dark” ASBs (recrystallization band). In addition, the equiaxed beta grains with diameters of 3-5 μm in the “dark” ASBs could not be explained by the sub-grain rotation dynamic recrystallization (RDR) mechanism using the traditional calculation method of temperature rise. Therefore, a modified equation for calculating temperature rise was used to determine the temperature in the ASBs, and the recalculated results of RDR kinetics equations have the excellent agreement with the microstructure observations.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yubo Wang, Weidong Zeng, Xin Sun, Jianwei Xu,