Structure Changes of High-Strength Economically Alloyed Steel 09KhGN2MD (09CrMnNi2MoCu) In Tempering
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The purpose of the present investigation is to determine the heat treatment parameters that ensure yield strength over 690 MPa in combination with toughness of at least 35 J/cm2 at temperature of –70°C in new economically alloyed cold-resistant steel. The effect of various quenching and tempering parameters on mechanical properties, structure of steel, and fracture mode of samples after impact tests at temperature of –70°C has been studied. The relationship between the properties, structure, and fracture mode of steel samples is shown. The heat treatment parameters of the investigated steel are determined.
Keywords:economically alloyed high-strength steel cold resistance reduction of carbon equivalent scanning electron microscopy transmission electron microscopy mechanical properties structure bainite martensite quenching tempering
Investigate were performed on the equipment of the laboratory of the Test and Technical Complex of Irradiated and Radionuclide Materials and the Center for Collective Use Composition, Structure, and Properties of Structural and Functional Materials of the National Research Center Kurchatov Institute—CRISM Prometey with financial support of the Ministry of Education and Science of the Russian Federation within the framework of agreement 14.595.21.0004.
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