Abstract
A Fe-0.45 wt% C alloy plate was subjected to surface mechanical attrition treatment (SMAT) in a camber filled with Cr powder and a nanocrystalline surface layer containing Cr element was produced during the treatment. Owing to the high diffusivity of nanocrystalline surface layer, Cr element can diffuse and be pressed into nanocrystalline surface layer during SMAT. Within the subsequent annealing process, Cr element can further diffuse in the surface layer, resulting in formation of new compounds, such as (Cr,Fe)23C6 and (Cr,Fe)7C3. SMAT within metallic powder, which can conveniently and effectively accomplish surface modification, should be concerned and utilized.
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