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Abstract
The fracture resistance of a number of ingot-mould materials has been characterized by the energy required to achieve unstable crack propagation W measured using fracture-toughness test techniques. It was shown that W appeared to be related to the resistance of an ingot mould to major cracking. In addition, using test-block materials the effect on fracture behaviour of graphite eutectic cell size, titanium, and pearlite/ferrite content in flake irons, and of graphite morphology and pearlite/ferrite content in nodular irons was studied. It was found that all of them could have a significant effect on ingot-mould behaviour, in some cases the possible effects being drastic.