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The microstructure characteristics of an Fe-Mn-C TWIP steel after deformation are investigated.The results show that the hot-rolled,cold-rolled and then annealed sample of the Fe-Mn-C TWIP steel has excellent mechanical properties,and the true stress-true strain curve from tension tests exhibits repeated serrations.The deformed microstructure exhibits the typical planar glide characteristics such as no cell formation,dislocation pile-ups on a single slip plane,mechanical twins and stacking faults.There are equiaxial and deep dimple structures in the fractograph,indicative of a ductile fracture.Microcracks initiate from inclusions and twin-twin intersections.Deformation and fracture processes are the formation,growth and coalescence of microvoids.
The microstructure characteristics of an Fe-Mn-C TWIP steel after deformation of investigated the results show that the hot-rolled, cold-rolled and then annealed sample of the Fe-Mn-C TWIP steel has excellent mechanical properties, and the true stress-true strain curve from tensile tests exhibits repeated serrations. The deformed microstructure exhibits the typical planar glide characteristics such as no cell formation, dislocation pile-ups on a single slip plane, mechanical twins and stacking faults. Here are equiaxial and deep dimple structures in the fractograph, indicative of a ductile fracture. Microcrafts inclusions and twin-twin intersections. Deformation and fracture processes are the formation, growth and coalescence of microvoids.