Abstract
A friction head with an embedded rolling bearing was designed, by which Fe-21Cr-17Mn-2.43Mo-Nb-0.83N high nitrogen steel was ground under rotating pressure. It was indicated that the forming process of surface nanometer grain included surface concentration plastic slip, twins deformation and fining, fragmentation and recrystallization of primary austenite grains. The plastically deformed layer is about 300μm. The surface grain is nanosize, and the grain size is about 10nm to 20nm.
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