Valeriy Dudko
Belgorod State University
Deformation (engineering)CreepRecrystallization (metallurgy)DislocationComposite materialMartensiteMetallurgyMaterials scienceTemperingLaves phaseAustenitic stainless steelLathGrain boundaryCarbideFracture mechanicsAnnealing (metallurgy)Equiaxed crystalsPrecipitation (chemistry)Dislocation creepMicrostructureStress (mechanics)Austenite
25Publications
10H-index
316Citations
Publications 25
Newest
#1J. Borisova (Belgorod State University)H-Index: 1
#2Valeriy Dudko (Belgorod State University)H-Index: 10
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 4 authors...
The impact toughness of a martensitic 12 Cr-0.6 Mo-2.2 W-4 Co-0.8 Cu-VNb (in wt pct) steel subjected to tempering at 770 °C for 3 hours and aging at 650 °C for 643 hours was examined in the temperature range of − 20 to 250 °C. The steel in the tempered condition exhibits a ductile-brittle transition temperature (DBTT) of 41 °C and a Charpy V-notch impact energy of 100 J/cm2 at a temperature of 20 °C. The tempered steel becomes completely brittle at 0 °C when the absorbed energy falls to 8 J/cm2....
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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 The effect of temperature on the impact toughness and fracture behavior of a 10% Cr-2% W-0.7% Mo-3% Co-0.05% Nb-0.2% V-0.008% B-0.003% N (all in wt%) steel was studied. The ductile-brittle transition (DBT) occurs at 10 °C. At the DBT temperature (DBTT), the onset of unstable crack propagation occurs at the maximum load. The embrittlement is attributed to the onset of unstable crack propagation at stresses below the general yielding. A decrease in nitrogen content and an increase in boro...
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#1Yu Borisova (Belgorod State University)H-Index: 3
#2Valeriy Dudko (Belgorod State University)H-Index: 10
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 5 authors...
Microstructural changes in the cast steel GX12CrMoWVNbN10-1-1 (Fe–0.11 C–0.31 Si–0.89 Mn–9.57 Cr–0.66 Ni–1.01 Mo–1.00 W–0.21 V–0.06 Nb–0.05 Cu–0.05 N in wt %) have been investigated after tests for long-term strength at a temperature of 620°C in the range of stresses of 120–160 MPa. Upon short-term creep (up to 5000 h), the tempered troostite structure and distribution of particles of proeutectoid constituents change insignificantly, except for the precipitation of particles of the Laves phase ∼...
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#1Alexandra Fedoseeva (Belgorod State University)H-Index: 11
#2E. Tkachev (Belgorod State University)H-Index: 6
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
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The effect of cobalt, tungsten, and boron on interfacial energy of precipitate/ferritic matrix in the 9% Cr martensitic steels on the base of creep tests at 650 °C under different applied stresses ranging from 80 to 220 MPa was investigated. An interfacial energy of M23C6 carbides, the Laves phase particles, and MX carbonitrides was estimated by comparison of theoretical curves obtained by Prisma software for the model steels for the exposure time of 2 × 104 h with experimental data measured by ...
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#1Valeriy Dudko (Belgorod State University)H-Index: 10
#2Andrey Belyakov (Belgorod State University)H-Index: 40
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 3 authors...
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#1Valeriy Dudko (Belgorod State University)H-Index: 10
#2Alexandra Fedoseeva (Belgorod State University)H-Index: 11
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 3 authors...
Abstract The mechanical behavior of a P92-type steel was studied by tension and Charpy impact tests in the temperature range of 77–293 K. The yield stress (YS) and uniform elongation increase concurrently with decreasing temperature because the steel exhibits work-hardening behavior. Transgranular dimpled fracturing remains the primary fracture mechanism under tension down to 193 K. Brittle fracture takes place at lower temperatures. At 77 K, the steel exhibits a well-defined yield plateau. Impa...
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#1Valeriy Dudko (Belgorod State University)H-Index: 10
#2Andrey Belyakov (Belgorod State University)H-Index: 40
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 3 authors...
The creep behavior of a P92-type steel was examined at 923 K. The threshold shear stress of 51 MPa was revealed by an analysis of steady state creep behavior at applied stress ranging from 118 to 200 MPa. The tempered martensite lath structure stabilized by M23C6-type carbide particles with an average size of about 110 nm and MX-type carbonitrides with a size of 40 nm located within ferritic matrix evolved after tempering. The transient creep at an applied stress of 118 MPa was accompanied by tw...
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#1Valeriy Dudko (Belgorod State University)H-Index: 10
#2Alexandra Fedoseeva (Belgorod State University)H-Index: 11
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 60
view all 4 authors...
The deformation behavior and the microstructure evolution under the creep of 10Kh9V2MFBR steel (Russian analog of the P92 steel) (in wt %, Fe–8.9% Cr–0.05% Si–0.2% Mn–1.9% W–0.5% Mo–0.25% V–0.07Nb–0.08% N–0.01% B) with the standard (0.1%) and lowered (0.018%) carbon contents have been investigated. After the heat treatment, which included normalizing at 1050°C and tempering at 720–750°C, carbides M 23 C 6 and carbonitrides M(C,N) are formed in the 10Kh9V2MFBR steel, while in the 02Kh9V2MFBR stee...
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In this work, we have investigated microstructural changes in steel 10Kh9V2MFBR (analog of P02 steel) after long-term creep tests at a temperature of 600°C under an initial stress of 137 MPa. Time to rupture was found to be more than 40000 h. It has been established that, in the zone of grips and in the neck region of the sample, the size of the particles of the M 23C6 carbides increases from 85 nm to 152 nm and 182 nm, respectively. In addition, large particles of the Laves phase with an averag...
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#1Valeriy DudkoH-Index: 10
#2Andrey BelyakovH-Index: 40
Last. Rustam KaibyshevH-Index: 60
view all 3 authors...
In this work, the sources of the high creep resistance of martensitic steels containing 9% Cr were considered based on the results of studying the evolution of the dislocation structure of martensite in P92-type steel in creep at 650°C. The steel structure after tempering was characterized by significant elastic microstrains of the crystal lattice, which were produced by dislocations of the same sign and long-range stresses from the dislocation boundaries of laths. The high creep strength of mar...
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