According to the algorithm of a developed comprehensive analytical solution method (CASM), a new cast high-temperature corrosion-resistant nickel alloy ZhS3LS-М has been developed for manufacture of all-cast nozzle appliances. The developed alloy is characterized by the high-temperature strength 975 40 s = 180-200 MPa at the level of the industrial non-corrosion-resistant alloy VZhL12E as well as technological weldability and corrosion resistance at the level of commercial weldable corrosion-resistant alloy ZhS3LS. 24 Ref., 11 Tables, 1 Figure.
* Metallographic examinations were carried out with the participation of T.A. Alekseenko. ** Testing at 600 °C/20 min showed larger spread of ψ values. Lower value was considered in carried analysis as the possible worth variant of ductility.
The effect of welding method and technique on the HAZ microstructure in dissimilar welded joint of the type reactor vessel steel + deposited austenitic layer was investigated. The results of metallographic studies and bend tests of the welded joints are evidenced that the development of technology for weld repair of an anticorrosive coating with access to the base metal without subsequent high tempering is advisable on the basis of "buttered layer" technique by MMA welding with layer-by-layer controlled change in linear energy. This approach provides a uniform fine-grained microstructure at the overheat region of the HAZ. TIG welding with the filler wire and constant layer-by-layer linear energy also allows to refine overheat region microstructure. However, in this case, it is characterized by two types of structural heterogeneity caused by intense overheating of the base metal and diffusion of alloying elements and carbon.
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