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Features of channel fracture for irradiated austenitic steels. Part 1. Experimental results
https://doi.org/10.22349/1994-6716-2025-121-1-185-204
Abstract
The experimental study results of the fracture properties and mechanisms are represented for austenitic 18Cr–9Ni steel irradiated at 400°С up to damage dose of 15 dpa. The fracture properties have been obtained for cylindrical smooth and notched specimens under uniaxial tension over temperature range from 20° up to 500°С, and the fracture surfaces have been examined by SEM to analyze the main fracture modes with emphasis on specific fracture mechanism of irradiated austenitic steels – channel fracture. Basing on the performed study results the temperature range and the main features of channel fracture are found. It is shown that the strain hardening decreases over the temperature range of channel fracture that is caused by channel (localized) deformation in the irradiated steel being necessary condition for channel fracture. Shares of various fracture modes are estimated depending on stress triaxiality and test temperature. It is shown that the channel fracture area share relative to total fracture surface area increases when stress triaxiality increases. The relief of channel fracture area and channel fracture facets surface is studied. Secondary deformation channels exits are revealed on the channel fracture facets surface that locate regularly on the distance of 1–2 μm each other. The obtained results are used for elaboration of channel fracture model and formulation of channel fracture criterion and for the proposed criterion verification that are considered in the second part of the paper.
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
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
E. A. Zernov
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
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Review
For citations:
Margolin B.Z., Shvetsova V.A., Sorokin A.A., Pirogova N.E., Buchatsky A.A., Zernov E.A. Features of channel fracture for irradiated austenitic steels. Part 1. Experimental results. Voprosy Materialovedeniya. 2025;(1(121)):185-204. (In Russ.) https://doi.org/10.22349/1994-6716-2025-121-1-185-204
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