A. A. Chernobaeva, O. D. Chebotayov, R. O. Polyakova, D. Yu. Erak, Yu. E. Pesnya, V. V. Trofimchuk, D. A. Mal’tsev, D. A. Zhurko, M. A. Skundin, S. A. Bubyakin
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Abstract—The structure, hardness, and ductile–brittle transition temperature (DBTT determined on small Charpy specimens) of the heat-affected zone (HAZ) of two standard welded joints of a VVER reactor vessel made of 15Kh2NMFA-A steel with different nickel contents (1.34 and 1.46 wt %) are studied. Two (high- and low-hardness) subzones are distinguished in the HAZ. The DBTT of the high-hardness subzone is shown to be 60–70°C lower than that of the base metal, which is caused by the formation of martensite and lower bainite structures and grain refinement. The DBTT of the low-hardness subzone is 20–30°C lower than that of the base metal, which is explained by a lower density of carbides in this zone.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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