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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
Article

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.

Keywords

Polymer Scanning Electron Microscopy Carbide Heat Treatment Fracture Toughness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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