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Recently, the grain refinement of metallic materials has been investigated intensively. There are two basic methods, i.e., severe plastic deformation and thermomechanical processing, to refine grain sizes of bulk steels for the ultrafine or submicron range. By severe plastic deformation submicron-grained microstructure (less than 1μm) in steels can be obtained. For example, the microstructure with...
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