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Plastic strain effect on cleavage microcracks propagation in probabalistic statement. Part 2. Research results
https://doi.org/10.22349/1994-6716-2024-119-3-169-186
Abstract
The second part of the paper presents the results of uniaxial tension testing of smooth round bars of 2Cr–Ni–Mo–V steel in the thermally-embrittled state and St3 steel in the initial state. SEM examination of the fracture surfaces is carried out. The brittle fracture probability is calculated using the Prometey model presented in the first part of this article. It has been found that the plastic strain effect on the microcrack propagation probability is caused by two reasons: (1) the critical brittle fracture stress increase due to formation of new barriers for microcrack under plastic deformation, and (2) the working volume decrease due to the neck formation in tensile round bar. A unified set of parameters has been proposed to take into account the plastic strain effect on cleavage microcracks propagation probability for WWER-1000 RPV steel and low-alloyed low-strength steel.
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. N. Fomenko
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand 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
F. L. Shishkov
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
E. V. Yurchenko
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
References
1. Margolin, B.Z., Fomenko, V.N., Shvetsova, V.A., Yurchenko, E.V., Radiatsionnoe i termicheskoe ohrupchivanie korpusnykh reaktornykh stalei: svyaz mekhanizmov okhrupchivaniya i razrusheniya s kharakteristikami zarozhdeniya i rasprostraneniya mikrotreshchin. Ch. 2. Kharakteristiki prochnosti i plastichnosti [Radiation and thermal embrittlement of reactor vessel steels: the relationship of embrittlement and fracture mechanisms with the characteristics of the origin and propagation of microcracks. Part 2. Characteristics of strength and ductility], Voprosy Materialovedeniya, 2024, No 1 (117), pp. 195–209.
2. Margolin, B.Z., Shvetsova, V.A., Gulenko, A.G., Kostylev, V.I., Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steels, Fatigue Fract. Engng. Mater. Struct., 2006, No 29 (9), pp. 697–713.
3. Margolin, B.Z., Fomenko, V.N., Shvetsova, V.A., Yurchenko, E.V., Radiatsionnoe i termicheskoe okhrupchivanie korpusnykh reaktornykh stalei: svyaz mekhanizmov okhrupchivaniya i razrusheniya s kharakteristikami zarozhdeniya i rasprostraneniya mikrotreshchin. Ch. 1. Strategiya, programma i metody eksperimentalnyh i raschetnykh issledovanii [Radiation and thermal embrittlement of reactor vessel steels: the relationship of embrittlement and fracture mechanisms with the characteristics of the origin and propagation of microcracks. Part 1: Strategy, program and methods of experimental and computational research], Voprosy Materialovedeniya, 2024, No 1 (117), pp. 173–194.
4. Fizicheskoe materialovedenie [Physical Materials Science], Kalina, B.A. (Ed.), V. 4, Moscow: MEPhI, 2008.
5. Margolin, B.Z., Fomenko, V.N., Shvetsova, V.A., Yurchenko, E.V., Radiatsionnoe i termicheskoe okhrupchivanie korpusnykh reaktornykh stalei: svyaz mekhanizmov okhrupchivaniya i razrusheniya s kharakteristikami zarozhdeniya i rasprostraneniya mikrotreshchin. Ch. 3. Modelirovanie khrupkogo razrusheniya i analiz svyazi kharakteristik zarozhdeniya i rasprostraneniya mikrotreshchin s mekhanizmami okhrupchivaniya [Radiation and thermal embrittlement of reactor vessel steels: the relationship of embrittlement and fracture mechanisms with the characteristics of the origin and propagation of microcracks. Part 3. Modeling of brittle fracture and analysis of the relationship between the characteristics of the origin and propagation of microcracks with embrittlement mechanisms], Voprosy Materialovedeniya, 2024, No 2 (118), pp. 166–186.
Review
For citations:
Margolin B.Z., Fomenko V.N., Shvetsova V.A., Shishkov F.L., Yurchenko E.V. Plastic strain effect on cleavage microcracks propagation in probabalistic statement. Part 2. Research results. Voprosy Materialovedeniya. 2024;(3(119)):169-186. (In Russ.) https://doi.org/10.22349/1994-6716-2024-119-3-169-186
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