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Microstructure evolution was studied in Fe-0.6%O processed by mechanical milling followed by consolidating warm bar rolling. Depending on the milling time, the fraction of high-angle grain boundaries that evolved in the final bulk material can decrease or, alternatively, increase by the consolidating working.
Initial grain size effect on submicrocrystalline structure evolution was studied in multiple compressions of a 304 stainless steel at 873 K (0.5T m ). Four sets of specimens with different initial microstructures were used, i.e. annealed samples with grain sizes of D 0 =15 and 2.2 μm, and dynamically recrystallised ones with D 0 =3.5 and 1.5 μm. The new ultra-fine-grains (D=0...
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