Nadezhda Dudova
Belgorod State University
Ultimate tensile strengthCharpy impact testFerrite (iron)Strain rateCreepRecrystallization (metallurgy)DislocationComposite materialDynamic recrystallizationHot workingHardening (metallurgy)MartensiteMetallurgyGrain sizeMaterials scienceTemperingLaves phaseAlloyLathHeat resistantFracture (geology)Grain boundaryCarbideTungstenNucleationAnnealing (metallurgy)Precipitation (chemistry)MicrostructureStress (mechanics)AusteniteThermodynamics
57Publications
13H-index
618Citations
Publications 60
Newest
Abstract The coarsening of Laves phase in a Re-containing 10% Cr-3% Co-3% W steel during both creep and ageing at 923 K was investigated. The depletion of W solutes from the ferrite matrix is accompanied with the precipitation of Laves phase, wherein creep strain accelerates both these processes. The equilibrium W content in the ferritic matrix of 1.24 wt% and the volume fraction of Laves phase of 1.6% is reached after 500 h of creep and 1000 h of ageing. This is related to lower activation ener...
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#1Nadezhda DudovaH-Index: 13
#2R. MishnevH-Index: 1
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Abstract The Z-phase (CrVN) precipitation in a 9% Cr–3% Co martensitic steel during creep at 923 K and 948 K has been investigated with aim to establish the effect of temperature on the nucleation mechanism of these particles and their coarsening behavior. Ostwald ripening of VX carbonitrides strongly affects these processes. An increase in creep temperature significantly accelerates the transformation of the nanoscale MX carbonitrides into the Z-phase particles causing the Z-phase nucleation in...
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#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
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An analysis of mechanical properties has been performed for 12% Cr and 9% Cr steels by means of tension tests at 20 and 650°C and yield tests at 650°C and applied stresses of 200–100 MPa with a step of 20 MPa. The yield strength and ultimate tensile strength of the 12% Cr steel are, correspondingly, 614 and 710 MPa at 20°С and 365 and 390 MPa at 650°C. At both temperatures, the strength properties of the 12% Cr steel under tension are better than for the 9% Cr steel due to higher values of contr...
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Abstract The nucleation of the Laves phase particles in a Re-containing 10% wt. Cr-3% Co-3% W steel with a low nitrogen and a high boron contents during creep is characterized by distinctive features. The precipitation process can be written as M23C6 carbide → M6C carbide → Laves phase. The nucleation of all phases in this precipitation sequence is heterogeneous. The M23C6 carbides precipitate on the boundaries of martensitic structure during tempering at temperature of 770 °C. The M6C (Fe3W3C) ...
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The influence of the temperature, applied stress, degree of creep deformation, and aging time on the formation of Z-phase (CrVN) particles in 9% Cr 10Kh9K3V2MFBR martensitic steel at temperatures of 650 and 675°С upon long aging is studied in this work. The particles with a chemical composition determined by energy dispersive spectrometry as 50% (Cr + Fe) and 50% (V + Nb) are detected and identified as particles of the Z‑phase. An increase in the creep test time at both temperatures led to the g...
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#1R. Mishnev (Belgorod State University)H-Index: 9
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
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Abstract Microstructure evolution and softening during interrupted low cycle fatigue (LCF) tests at 600°C and constant strain amplitudes of ±0.2% and ±0.6% corresponding to dominance of the elastic and plastic strain components, respectively, was examined in a 10% Cr steel. Cyclic softening attributed to changes in the strengthening from dislocations and lath structure is more pronounced during the first half-life. The Burgers vector analysis of dislocation reveals the role of the single and mul...
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Abstract Re-containing 10Cr-3Co-3W martensitic steel with low nitrogen and high boron contents exhibited a rupture time of 10,987 h at 650°C/140 MPa. This superior creep resistance was caused by partially saved tempered martensite lath structure due to precipitation of M23C6 carbides and Laves phase chains on lath boundaries as well as their high resistance to coarsening. M23C6 carbides were characterized by decreased interfacial energy that resulted in the retention of the orientation relations...
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#1R. Mishnev (Belgorod State University)H-Index: 9
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Andrey Belyakov (Belgorod State University)H-Index: 40
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An advanced, high chromium, creep-resistant steel was subjected to the tensile tests and three-point bending tests of Charpy V-notch specimens at temperatures of −196 to 20 °C. The steel exhibited ductile fracture under tension tests at all of the temperatures studied. The mechanical properties, i.e., strength and uniform elongation, were enhanced with a decrease in temperature down to −140 °C. Transgranular, dimpled fracture remained the primary fracture mechanism under tension. On the other ha...
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