Surface integrity analysis when milling ultrafine-grained steels

AUTOR(ES)

Rodrigues, Alessandro Roger, Balancin, Oscar, Gallego, Juno, Assis, Cleiton Lazaro Fazolo de, Matsumoto, Hidekasu, Oliveira, Fernando Brandão de, Moreira, Suzana Regina da Silva, Silva Neto, Otavio Villar da

FONTE

Materials Research

DATA DE PUBLICAÇÃO

13/12/2011

RESUMO

This paper quantifies the effects of milling conditions on surface integrity of ultrafine-grained steels. Cutting speed, feed rate and depth of cut were related to microhardness and microstructure of the workpiece beneath machined surface. Low-carbon alloyed steel with 10.8 µm (as-received) and 1.7 µm (ultrafine) grain sizes were end milled using the down-milling and dry condition in a CNC machining center. The results show ultrafine-grained workpiece preserves its surface integrity against cutting parameters more than the as-received material. Cutting speed increases the microhardness while depth of cut deepens the hardened layer of the as-received material. Also, deformations of microstructure following feed rate direction were observed in workpiece subsurface.

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