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Zisman A.A.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Petrov S.N.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Ptashnik A.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey
Metallurgist | Year: 2015

A method is considered for panoramic crystallographic analysis of bainite and martensite structures based on images of crystal lattice curvature and making it possible to identify α-phase varieties, and also to determine their volume fraction. The method is proven successfully for high-temperature alloy steels, for which by means of dilatometry and expert evaluation of metallographic images a characteristic scale is plotted for lattice curvature, whose ranges correspond to bainite and martensite structural types. © 2015, Springer Science+Business Media New York. Source


Korotovskaya S.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Orlov V.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Khlusova E.I.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey
Metallurgist | Year: 2014

The possibility is established of ultrafine grained structure formation in low-alloy steels as a result of occurrence of fragmentation in austenite during deformation below the recrystallization temperature. The fractional nature of austenite deformation at temperatures for retarded recrystallization has a favorable effect on the refinement of the ferritic-bainitic steel structure. For steel with a bainitic structure, the deformation frequency does not have a marked effect. © 2014, Springer Science+Business Media New York. Source


Kruglova A.A.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Orlov V.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Sharapova D.M.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey
Metallurgist | Year: 2015

Simulation modeling is used in order to study metal structure in a heat-affected zone (HAZ) during submerged-arc welding. A correlation is established between low values of impact energy observed and features of HAZ structure formation during submerged-arc welding of low-alloy steel of strength category K70. It is shown that the appearance of brittle precipitates with an increase in content of the main alloying elements at large grain boundaries is a reason for low impact energy in the area of large HAZ grains during steel K70 welding. Development of these areas is connected with repeated heating (simulating a second pass during rolling) in a temperature range somewhat lower than the Ac1 point. A reduction in cooling rate in the first heating cycle (which corresponds to an increase in linear energy during welding) facilitates precipitate enlargement over grain boundaries. Multipass welding and a reduction in pass linear energy are recommended in order to exclude the formation of these areas and to improve and stabilize impact energy in a welded joint HAZ. © 2015 Springer Science+Business Media New York Source


Korotovskaya S.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Orlov V.V.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Khlusova E.I.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey
Metallurgist | Year: 2014

Principles are established for controlling low-alloy steel structure formation during thermomechanical treatment for the possibility of creating steels for different purposes from slabs of a single chemical composition. Technology is developed for manufacturing high-strength shipbuilding steels with a yield strength of 460 MPa and strength category K65 pipe steels of unified chemical composition. © 2014, Springer Science+Business Media New York. Source


Pichuzhkin S.A.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Chernobaev S.P.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey | Vainerman A.A.,Prometey Central Research Institute of Structural Materials TsNII KM Prometey
Chemical and Petroleum Engineering | Year: 2016

As a result of experimental research, regimes are determined for mechanized argon-arc welding of copper alloys MNZh5-5, L90, and BrAMts9-2 with steels AB2 and 20, providing preparation of high quality joints during manufacture of chemical and petrochemical engineering objects. © 2016 Springer Science+Business Media New York Source

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