Suchergebnisse

The method of orientation microscopy (EBSD) is used to study the structure and texture of low-carbon, low-alloy pipe steel sheets processed by controlled thermomechanical processing (TMCP). The temperatures of isothermal hot rolling varied. Samples cut from sheets showed a different fracture tendency during mechanical testing. The formation of cleavages (secondary cracks) during failure of steel is related to the presence of ferrite grains with orientation {001} extended in the hot rolling direction. The formation of grains is a consequence of the isothermal hot rolling below the temperature Ac3 at TMCP. ; The work was carried out using the laboratory equipment "Structural methods of analysis and properties of materials and nanomaterials" of the Center of Ural Federal University. The work has been carried with the support of the Russian Science Foundation, grant No. 19-79-20006. Authors are grateful for the assistance the program of support for leading universities in Russian Federation for improvement of their competitiveness №211 of the Government №02.A03.21.0006. The authors thank MMK company for support and assistance in organizing the study.

Scanning electron microscopy with orientation analysis by the electron backscatter diffraction (EBSD) method is used to study microstructures and textures formed in the 0.08C-13Cr-3Ni-Mo-V-Nb steel through seamless tube production route: after hot deformation by extrusion; after quenching from various temperatures and subsequent high tempering. It is shown that the martensitic microstructure formed both after hot deformation and after quenching is characterized by the presence of deformation crystallographic texture, which is predetermined by the texture of austenite. The effect of heat treatment on texture, packet refinement, lath width, precipitation of carbides and Charpy impact energy is analyzed. © 2017 Author(s). ; The work was done using the equipment of the laboratory of Structural Methods of Analysis and Properties of materials and nanomaterials of the Collective Use Center affiliated to Ural Federal University. The study was supported by the program of increasing the competitiveness of the leading Russian universities, RF Government resolution No. 211, contract No. 02.А03.21.0006. We are grateful to the TMK company for their support and assistance in organizing the study.