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Features of channel fracture for irradiated austenitic steels. Part 2. Channel fracture model and criterion
https://doi.org/10.22349/1994-6716-2025-121-1-205-224
Abstract
On the basis of experimental data considered in the first part of the paper the channel fracture model is represented and channel fracture criterion is formulated for irradiated austenitic steels. The model and criterion are based on the initiation of microcracks in channel deformation plane due to intersection with secondary channels and on the microcracks growth by shear. The proposed model and criterion of the microcracks initiation in channel deformation plane explain why channel fracture is observed in irradiated FCC metals and never observed in irradiated BCC metals although channel deformation being necessary condition for channel fracture occurs in the both metals. Procedure for the criterion parameter determination is proposed on the basis of the test results of standard tensile cylindrical specimen and cylindrical specimen with circular notch tested at one temperature over the channel fracture temperature range. Numerical values of the criterion parameters are found when using the test results represented in the first part of the paper. The proposed channel fracture criterion has been verified as applied to irradiated 18Cr–9Ni steel by comparison of the experimental and calculated values of the fracture strain for specimens with various stress triaxialities and for specimens tested at different temperatures.
About the Authors
B. Z. Margolin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Dr Sc. (Eng),
49 Shpalernaya St, 191015 St Petersburg
V. A. Shvetsova
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Phys-Math),
49 Shpalernaya St, 191015 St Petersburg
A. A. Sorokin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng),
49 Shpalernaya St, 191015 St Petersburg
E. A. Zernov
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
N. E. Pirogova
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng),
49 Shpalernaya St, 191015 St Petersburg
A. A. Buchatsky
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng),
49 Shpalernaya St, 191015 St Petersburg
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Review
For citations:
Margolin B.Z., Shvetsova V.A., Sorokin A.A., Zernov E.A., Pirogova N.E., Buchatsky A.A. Features of channel fracture for irradiated austenitic steels. Part 2. Channel fracture model and criterion. Voprosy Materialovedeniya. 2025;(1(121)):205-224. (In Russ.) https://doi.org/10.22349/1994-6716-2025-121-1-205-224
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