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

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.

Automated summary

Multi-barrier cleavage models consider the fracture characterized by a series of microscale events. However, there are strong variations of cleavage parameters across different types of steels which have not been systematically studied. In this paper, cleavage parameters for different steels are determined and it is found that the parameters depend on particle morphology, composition, and hierarchical grain structure. The determined values of the cleavage parameters are consistent among the different steels, allowing for further application in microstructure design for controlling macroscopic toughness.