Journal of Materials Science

, Volume 30, Issue 13, pp 3383–3386 | Cite as

Breakup of eutectic carbide network of white cast irons at high temperatures

  • Ma Qian
  • Liu Baicheng
  • Wang Zhaochang


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.


Polymer Scanning Electron Microscopy Carbide Heat Treatment Fracture Toughness 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • Ma Qian
    • 1
  • Liu Baicheng
    • 1
  • Wang Zhaochang
    • 2
  1. 1.Department of Mechanical EngineeringTsinghua UniversityBeijingPeople’s Republic of China
  2. 2.Department of MetallurgyUniversity of Science and TechnologyBeijingPeople’s Republic of China

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