Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels

Quanxin Jiang*, Virgínia M. Bertolo, Sakari Pallaspuro, Vera Popovich, Jilt Sietsma, Carey L. Walters

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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Multi-barrier cleavage models consider cleavage fracture which is characterized by a series of microscale events. One of the challenges for multi-barrier cleavage models is the strong variations of cleavage parameters across different types of steels. The source and magnitude of the variations have not been studied systematically. In the current paper, cleavage parameters corresponding to fracture initiation at a hard particle and crack propagation overcoming grain boundaries are determined for three bainitic steels, a martensitic steel, and a ferritic steel, using a recently proposed model. It is found that the particle fracture parameter depends on particle morphology and composition, while the grain boundary cleavage parameter depends on the hierarchical grain structure. The determined values of cleavage parameters present a high degree of consistency among the five different steels, which allows the further application on microstructure design to control macroscopic toughness.

Original languageEnglish
Article number109146
Number of pages16
JournalEngineering Fracture Mechanics
Publication statusPublished - 2023


  • Cleavage
  • Fracture toughness
  • Local approach to fracture
  • Multi-barrier modelling
  • Statistical modelling


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