Alexandra Fedoseeva
Belgorod State University
Ultimate tensile strengthFerrite (iron)CreepDislocationComposite materialMartensiteMetallurgyMaterials scienceTemperingLaves phaseLathLong term ageingPhase (matter)CarbideTungstenNucleationOstwald ripeningPrecipitation (chemistry)MicrostructureStress (mechanics)Austenite
43Publications
10H-index
283Citations
Publications 43
Newest
Source
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...
1 CitationsSource
#1Alexandra FedoseevaH-Index: 10
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 58
view all 4 authors...
Source
#1Alexandra FedoseevaH-Index: 10
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 58
view all 4 authors...
Source
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...
Source
#1Alexandra FedoseevaH-Index: 10
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 58
view all 6 authors...
3 CitationsSource
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
#1Alexandra FedoseevaH-Index: 10
#2I. NikitinH-Index: 5
Last. Rustam KaibyshevH-Index: 58
view all 4 authors...
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) ...
5 CitationsSource
#1I. NikitinH-Index: 5
#2Alexandra FedoseevaH-Index: 10
Last. Rustam KaibyshevH-Index: 58
view all 3 authors...
The contributions from the martensitic laths, dislocations, secondary phase particles, and supersaturated solid solutions to the overall strength of the 12%Cr–3%Co–2.5%W creep-resistant steel with low N and high B contents were calculated after various heat treatments consisting of normalizing followed by medium-temperature tempering. An increase in the normalizing temperature from 1050 to 1150 °C led to an increase in the average size of the prior austenitic grains from 44 to 68 μm, but the δ-f...
6 CitationsSource
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...
1 CitationsSource