چکیده
|
In this work, we study the flow hardening behavior and microstructural evolution in a low-density
Fe-21Mn-0.1C-2.0Al-2.5Si (wt.%) transformation-twinning-induced plasticity steel during hot compression.
The substructures were examined by transmission electron microscopy and electron backscatter diffraction
methods. The alloy exhibits a combination of strain hardening (at low and medium true compression
strains, <0.2) followed by a strain softening at 800 C. We explain the flow hardening behavior in terms of
substructure refinement due to planar dislocation, as well as twin-like structure. The transmission electron
microscopy results suggest that short-range ordering triggers slip planarity after straining to 0.05 at
800 C. Twin-like structure with misorientation angle higher than 20 is formed during further plastic
deformation.
|