Ekaterina Yashina

• MD
• Peter the Great St.Petersburg Polytechnic University

Accelerated cooling of high-strength steels directly after hot rolling is economically efficient because it makes it possible to exclude their quenching following furnace heating. However, after such a treatment , the material possesses structural features that require special analysis. In particular, extended domains of a coarse bainite structure...

Accelerated cooling of high-strength steels directly after hot rolling is economically efficient because it makes it possible to exclude their quenching following furnace heating. However, after such a treatment , the material possesses structural features that require special analysis. In particular, extended domains of a coarse bainite structure...

The direct quenching of high-strength steels after hot rolling, which enables discard of the reheating operation, is economically efficient but necessitates a careful analysis of corresponding structural features. In particular, this treatment sometimes results in extended domains of coarse bainite decreasing the fracture toughness of steel. To rev...

This paper is focused on the comparative investigation of the structure of rolled plates from low-alloy cold-resistant steel 08KhN2MDB with a guaranteed yield strength of 750 MPa after traditional reheat quenching and quenching from rolling heat (direct quenching) with subsequent high-temperature tempering. The investigation has been carried out by...

The paper shows comparative investigations of structure of rolled plates from low alloyed coldresistant steel 08CrNi2MoCuNb with guaranteed yield strength 750 MPa after traditional reheat quenching and quenching from rolling heat (direct quenching) with subsequent high temperature tempering. The research is carried out by means of optical metallogr...

Processes of dynamic and static recrystallization occurring at different conditions of plastic deformation (reduction modes, deformation temperature) of low-carbon low-alloyed steel are under consideration. Modeling of thermomechanical processing is carried out at Gleeble 3800, followed by complex microstructural analysis. Temperature-deformation c...

The paper presents the results of a comprehensive study of structural and properties changes in the most dangerous regions of the heat-affected zone of low-alloyed cold-resistant steel with a guaranteed yield strength of 355–390 MPa before and after the post-welding tempering, including when the heating temperature is subjected to tempering and def...

The possibility of using neutron diffraction in quantitative analysis of residual austenite in steels is investigated. According to the obtained results, some properties of neutron diffraction by two-phase structures remain size-independent, which makes it possible to use large composite standards. It is shown that this approach ensures admissible...

Structural changes developing under tempering of low-carbon martensitic steel are studied by the method of electron backscatter diffraction. The evolution of the crystal lattice curvature reflecting the softening process and the packet-block structure of the martensite are analyzed. The dependence of the self-accommodation of packets on the combina...

Penetrability of neutrons ensures diffraction from rather large (~10cm 3) metal volumes sufficient to fabricate composite samples with predefined phase fractions. In principle, calibration on them allows one to discard a priori theoretical parameters in phase analysis, e.g. quantification of retained austenite in steels. However this approach is se...

Penetrability of neutrons ensures diffraction from rather large (~10cm 3) metal volumes sufficient to fabricate composite samples with predefined phase fractions. In principle, calibration on them allows one to discard a priori theoretical parameters in phase analysis, e.g. quantification of retained austenite in steels. However this approach is se...

Conventional procedures for quantitative analysis of retained austenite in steels by neutron diffraction ignore the effect of crystallographic texture and rely on a-priori parameters rather than a direct calibration with appropriate etalons. As the main drawback, this method is not directly verified by independent data. In order to get over the ver...