Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels
Jiang, Quanxin; Bertolo, Virgínia M.; Pallaspuro, Sakari; Popovich, Vera; Sietsma, Jilt; Walters, Carey L. (2023-02-22)
Quanxin Jiang, Virgínia M. Bertolo, Sakari Pallaspuro, Vera Popovich, Jilt Sietsma, Carey L. Walters, Microstructure-based cleavage parameters in bainitic, martensitic, and ferritic steels, Engineering Fracture Mechanics, Volume 281, 2023, 109146, ISSN 0013-7944, https://doi.org/10.1016/j.engfracmech.2023.109146
© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2023040535167
Tiivistelmä
Abstract
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.
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