Investigation on micromechanism and stress state effects on cleavage fracture of ferritic-pearlitic steel at −196°C

Mechanical tests of a ferritic-pearlitic steel were conducted at −196°C with various specimen geometries resulting in different stress states. Elastic-plastic finite element method (FEM) simulations were used to analyze the local stress and strain distributions of the studied steel. It is found that...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-02, Vol.686, p.134-141
Main Authors: He, Jinshan, Lian, Junhe, Golisch, Georg, He, An, Di, Yidu, Münstermann, Sebastian
Format: Article
Language:English
Subjects:
Axial stress
Cementite
Cleavage
Cleavage fracture
Computer simulation
Crack initiation
Equivalent plastic strain
Ferritic stainless steel
Ferritic stainless steels
Finite element analysis
Finite element method
Lode angle
Mechanical tests
Plastic deformation
Plastic strain
Stress state
Stress triaxiality
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Summary:Mechanical tests of a ferritic-pearlitic steel were conducted at −196°C with various specimen geometries resulting in different stress states. Elastic-plastic finite element method (FEM) simulations were used to analyze the local stress and strain distributions of the studied steel. It is found that cementite lamellae are the initiation sites for cleavage fracture. In addition, the cleavage fracture critical stage and the local equivalent plastic strain at initiation site varies with stress triaxiality and Lode angle.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.01.042