Shot Peening Induced Plastic Deformation in Cast Iron : Influence of Graphite Morphology

• Graphite morphology in cast irons strongly affects their mechanical properties like the Young’s modulus, tensile/compressive strength and cyclic mechanical behaviour. In this paper, pearlitic compact graphite iron (CGI) and grey cast iron (GI) have been studied in a scanning electron microscope (SEM) before and after being shot peened under different conditions. The plastic deformation behaviour of CGI and GI under different shot peening conditions is analysed using electron backscattering diffraction (EBSD) and electron contrast channelling imaging (ECCI). EBSD and ECCI revealed that plastic deformation around graphite inclusions depends on the size and shape of the graphite. The different response of CGI and GI to shot peening is explained by the different damping properties of the graphite and the matrix capability for plastic deformation.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Shot peening

cast iron

graphite morphology

EBSD

residual stress

Publikations- och innehållstyp

vet (ämneskategori)

ovr (ämneskategori)