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Experimental study of the brittle–ductile transition in hot cutting of SG iron specimens

Article dans une revue avec comité de lecture
Author
FOUILLAND-PAILLE, Laurence
ccEL MANSORI, Mohamed
85714 Laboratoire de Mécanique et Procédés de Fabrication [LMPF]
128006 MECASURF [MECASURF]

URI
http://hdl.handle.net/10985/8634
DOI
10.1016/j.jmatprotec.2012.08.012
Date
2013
Journal
Journal of Materials Processing Technology

Abstract

The present paper investigates the brittle-ductile transition (BDT) of the primary shear zone during cutting of spheroidal graphite (SG) iron in the austenitization temperature range (around 1000 °C). The experimental tests were performed using a cutting test bench in the cutting speed range of 0.8 to 1.6m.s-1. The cut surfaces were studied using optical microscopy and Scanning Electron Microscope (SEM) analysis techniques. The obtained results revealed either consequent deep fractured regions governed by a brittle-cracking regime (BCR) or a crack-free cut surface governed by a ductile-shear regime (DSR) with large plastic deformations. When cutting data were discussed with respect to the influences of cutting parameters and obtained cut surface, the correlation is significantly rich. Both cut surface integrity, cutting force curves and metallographic results show a BDT indicating a change in the dominating hot cutting process mechanism. Such a transition is associated with the dynamic recrystallization promoting strain softening and hot cutting by ductile shearing.

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