Materials Research (Feb 2012)

Surface integrity analysis when milling ultrafine-grained steels

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

Journal volume & issue
Vol. 15, no. 1
pp. 125 – 130

Abstract

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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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