Ivan Nikitin
Belgorod State University
Ultimate tensile strengthCrystal structureFerrite (iron)Yield (engineering)Strain rateChemical compositionCreepDegradation (geology)Precipitation hardeningDislocationComposite materialHardening (metallurgy)MartensiteMetallurgyMaterials scienceTension (physics)TemperingLaves phaseLathMetallic materialsCreep testingHeat resistantLong term ageingTreatment regimenEnergy dispersive spectrometryFracture (geology)Phase (matter)ChromiumTantalumCarbideNucleationTerm (time)Volume fractionDiffusionAnnealing (metallurgy)Selection (genetic algorithm)MicrostructureStress (mechanics)Austenite
17Publications
2H-index
9Citations
Publications 17
Newest
#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 4 authors...
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#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 4 authors...
Source
#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 6 authors...
Source
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...
Source
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...
Source
#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 5 authors...
Source
#1Alexandra FedoseevaH-Index: 11
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 5 authors...
Co-modified 12%Cr martensitic steels are perspective materials for steam blades for fossil power plants which are able to work at ultra-supercritical parameters of steam (T=620-650°C, P=25-30 MPa). The microstructure and mechanical properties of two Ta-containing and Ta-free Co-modified 12%Cr martensitic steels subjected to the normalizing at 1050-1070°C and tempering at different temperatures ranging from 750 to 800 °C were studied. After normalizing at 1050-1070°C, the average size of prior au...
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#1Ivan NikitinH-Index: 2
#2Alexandra FedoseevaH-Index: 11
Last. Rustam KaibyshevH-Index: 60
view all 4 authors...
The effect of heat treatment on the microstructure and mechanical properties of Febal-0.1 wt.%C-12Cr-3Co-2.5W-1Cu-VNbTaBN steel was investigated. After normalization in the range of 1050-1150°C, the martensitic structure was dominant; δ-ferrite content was about 10%. When the temperature of normalizing increased from 1050°C to 1150°C, the average size of prior austenite grains increased from 44 to 68 µm. After tempering at 750, 770 and 800°C, tempered martensitic lath structure with a high dislo...
Source
#1Alexandra Fedoseeva (Belgorod State University)H-Index: 11
#2Ivan Nikitin (Belgorod State University)H-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 4 authors...
Abstract—The mechanism of the nucleation of Z-phase (CrVN) particles in a martensitic 10Kh9K3V2MFBR steel (9 wt % Cr) during creep at a temperature of 650°C is studied. The nucleation mechanism of Z-phase particles at a creep temperature of 650°C is found to be restructuring of the crystal lattice of V(C,N) carbonitrides due to the diffusion of chromium atoms. The transformation of nanosized V(C,N) carbonitrides into Z-phase particles is shown to weakly contribute to the structural degradation i...
Source
#1Alexandra FedoseevaH-Index: 11
#3Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 60
view all 4 authors...
Source
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