Rodrigues, Alessandro RogerBalancin, OscarGallego, Juno [UNESP]Fazolo de Assis, Cleiton LazaroMatsumoto, Hidekasu [UNESP]de Oliveira, Fernando Brandao [UNESP]da Silva Moreira, Suzana Regina [UNESP]da Silva Neto, Otavio Villar2014-05-202014-05-202012-01-01Materials Research-ibero-american Journal of Materials. São Carlos: Universidade Federal de São Carlos (UFSCar), Dept Engenharia Materials, v. 15, n. 1, p. 125-130, 2012.1516-1439http://hdl.handle.net/11449/9916This 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 mu m (as-received) and 1.7 mu m (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.125-130engmillingsurface integritymicrostructuremicrohardnessultrafine-grained steelArtigo10.1590/S1516-14392011005000094S1516-14392012000100017WOS:000300791600017Acesso abertoS1516-14392012000100017.pdf719387229481868901840752045109770000-0002-5477-8139