If you would only type a subset of your words in google you would find hundreds of links which can much better explain this extremely general question. And you don't have to wait! One link I added for inspiration. There are several links to papers and books which will keep you busy for the next weeks. Good luck!
I nearly forgot: If you still should have then any question don't hesitate to ask!
http://www.mawi.tu-darmstadt.de/media/phm/skripte/Recrystallization_Script_Research_Lab_II_N.pdf
there are many methods to evaluate deformed and rex. area. even optical microscopy can help you on that. simple way is hardness measurement while hardness in deformed area is much higher than Rex. area.
there are also more precious method like EBSD and TEM. the dislocation density difference is clear in IQ map of EBSD.
You can always use EBSD. It might be a bit tricky with the light microscopy to distinguish though. You can check our following paper for compared microstructures of dynamically and statically recrystallised, recovered and deformed grains of aluminium from extrusion process. Regards.
http://www.sciencedirect.com/science/article/pii/S0924013615302107
Recrystallization microstructure depends on state of materials before applied strain , strength of the strain and tempering temperature. Small grain may be coarsening, large grain may also be refined. The roughening grain can be seen with the naked eye, such as single crystal growth of strain annealing.
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