Analysis of Ductile Cast Iron Tensile Tests to Relate Ductility Variaton to Casting Defects and Material Microstructure

This paper describes an experimental and analytical study to correlate the variation in ductility in ductile cast iron to casting defects and the cast iron¿s microstructure. A large set of tensile and fracture specimens taken from three inserts for the Swedish KBS-3 programme were tested. Eigthy-one one of 150 tested tensile specimens were analysed by metallography and fractography to identify and size defects and microstructural variations. It was found that the elongation at fracture was reduced by casting defects in the form of magnesium-oxide films and to a lesser extent by the graphite properties and pearlite content. The paper presents an elastic-plastic probabilistic fracture mechanics model that relates the variation in ductility to the size and shape of casting defects. The agreement between computed and measured results is quite good.

NILSSON Karl-Fredrik;  VOKAL Vratko; 

2009-01-26

ELSEVIER SCIENCE SA

JRC46278

0921-5093,   

www.elsevier.com/locate/msea,    https://publications.jrc.ec.europa.eu/repository/handle/JRC46278,   

10.1016/j.msea.2008.09.082,