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Study of the structure and properties of the metal of reactor pressure vessel welded joints made of Cr–Mo–V steel in the process of manufacture and operation
https://doi.org/10.22349/1994-6716-2022-110-2-111-123
Abstract
The paper presents a study of changes in the structure and mechanical properties of the metal of the welded joints of steel 15Cr2МoVА-А mod. A during post weld heat treatment (PWHT) at the reactor pressure vessel (RPV) manufacturing and also as a result of thermal exposure during its operation. It has been established that in as-welded state, the weld metal has a satisfactory level of plastic characteristics and high values of impact strength, but an excessively high level of strength properties. PWHT at 655°C reduces the strength properties, but does not lead to a significant increase of impact strength level. The final properties are formed by PWHT at 670°C. At the indicated temperatures, the low sensitivity of the heat affected zone (HAZ) metal and the base metal to tempering as well as to thermal exposure at 350°C, has been revealed.
About the Authors
M. N. Timofeev
NRC Kurchatov Institute – CRISM Prometey
Russian Federation
Russian Federation
Cand Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
S. N. Galyatkin
NRC Kurchatov Institute – CRISM Prometey
Russian Federation
Russian Federation
Cand Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
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For citations:
Timofeev M.N., Galyatkin S.N. Study of the structure and properties of the metal of reactor pressure vessel welded joints made of Cr–Mo–V steel in the process of manufacture and operation. Voprosy Materialovedeniya. 2022;(2(110)):111-123. (In Russ.) https://doi.org/10.22349/1994-6716-2022-110-2-111-123
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