Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels
article
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. (C) 2023 The Author(s)
Topics
TNO Identifier
982779
ISSN
00137944
Source
Engineering Fracture Mechanics, 281, pp. 1-16.
Publisher
Elsevier Ltd
Article nr.
109146
Pages
1-16