Abstract
The fracture toughness of white cast irons is related to the morphology of eutectic carbides,being better when isolated than when network-like. In this paper observations on the breakup of eutectic cementite network during annealing treatment of white cast irons are reported using a high temperature microscope and scanning electron microscopy (SEM). Dissolution-induced breakup and capillarity-induced breakup are identified. The former occurs through growth of holes and pre-existing fissures as well as through fragmentation at narrow necks and narrow roots of branches. The latter is observed through growth of perturbations. Dissolution-induced breakup is closely associated with the morphology of the as-cast eutectic cementite. A combination of solidification processing and heat treatment thus produces a more positive breakup effect.
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Qian, M., Baicheng, L. & Zhaochang, W. Breakup of eutectic carbide network of white cast irons at high temperatures. Journal of Materials Science 30, 3383–3386 (1995). https://doi.org/10.1007/BF00349883
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DOI: https://doi.org/10.1007/BF00349883