R. Mishnev
Belgorod State University
Ultimate tensile strengthDynamic strain agingCharpy impact testBrittlenessEmbrittlementStrain rateCreepDislocationComposite materialHardening (metallurgy)MartensiteMetallurgyGrain sizeMaterials scienceTemperingLaves phaseLow-cycle fatigueAlloyLathSofteningTotal strainFerritic matrixFracture (geology)FractographyBoronCarbideFracture mechanicsNucleationPrecipitation (chemistry)MicrostructureStress (mechanics)
22Publications
10H-index
261Citations
Publications 22
Newest
#1Alexandra FedoseevaH-Index: 10
#2Ivan NikitinH-Index: 2
Last. Rustam KaibyshevH-Index: 58
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3 CitationsSource
#1R. Mishnev (Belgorod State University)H-Index: 10
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
view all 3 authors...
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...
5 CitationsSource
#1R. Mishnev (Belgorod State University)H-Index: 10
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Andrey Belyakov (Belgorod State University)H-Index: 41
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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...
5 CitationsSource
#1R. MishnevH-Index: 10
#2Nadezhda DudovaH-Index: 13
Last. Rustam KaibyshevH-Index: 58
view all 3 authors...
The effect of short-term aging (100 h) at 650°C on the temperature dependence of impact toughness and fracture behavior of advanced 10% Cr steel with low N and high B contents was studied. The steel in tempered condition exhibits the ductile-brittle transition temperature (DBTT) of ∼10°C and the Charpy V-notch impact energy of 240 J/cm2 at a temperature of 20°C. Aging for 100 h at 650°C leads to the increase in the DBTT to 35°C and decrease in the impact toughness at 20°C to 90 J/cm2. Effect of ...
Source
#1Nadezhda Dudova (Belgorod State University)H-Index: 13
#2R. Mishnev (Belgorod State University)H-Index: 10
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
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Abstract The purpose of this study is to identify the relationships between the creep behavior of the 10% Cr martensitic steel with 0.008% B and 0.003% N and changes in microstructure and precipitations of secondary phases. Creep tests were carried out at 650 °C under an applied stress ranging from 180 to 120 MPa. The 10% Cr steel exhibits a linear stress vs. time to rupture dependence without creep strength breakdown up to approximately 40 000 h. The 100 000 h creep rupture strength at 650 °C i...
16 CitationsSource
#1J. Borisova (Belgorod State University)H-Index: 1
#2Valeriy Dudko (Belgorod State University)H-Index: 9
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
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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....
2 CitationsSource
#1R. Mishnev (Belgorod State University)H-Index: 10
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
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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...
9 CitationsSource
#1R. Mishnev (Belgorod State University)H-Index: 10
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
view all 3 authors...
Abstract A low-nitrogen 10% Cr martensitic steel containing 3% Co and 0.008% B was shown to exhibit an extremely long creep rupture time of ∼4·104 h under an applied stress of 120 MPa at 650 °C. The creep behavior and evolution of lath martensite structure and precipitates during creep at these conditions were studied. The main feature of the microstructure under long-term creep is retention of the lath structure until rupture. The following microstructural factors affecting the superior creep r...
20 CitationsSource
#1R. MishnevH-Index: 10
#2Nadezhda DudovaH-Index: 13
Last. Rustam KaibyshevH-Index: 58
view all 3 authors...
The low cycle fatigue behavior of a 10Cr–2W–0.7Mo–3Co–NbV steel with 80 ppm of B additions was studied at elevated temperatures of 600 and 650°C. The steel after normalizing and tempering at 770°C was tested under fully reversed tension-compression loading with the total strain amplitude controlled from ±0.2 to ±1.0% at temperatures of 600 and 650°C. It was revealed that the steel exhibits a positive temperature dependence of both the cyclic strain hardening exponent n′ and the cyclic strength c...
Source
#1R. Mishnev (Belgorod State University)H-Index: 10
#2Nadezhda Dudova (Belgorod State University)H-Index: 13
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
view all 3 authors...
Abstract The effect of a strain rate varying from ∼10−3 to ∼10−5 s−1 at a strain amplitude ranging from ±0.2% to ±0.6% on the low cycle fatigue (LCF) behavior and the microstructure of a 10%Cr-2%W-0.7%Mo-3%Co-NbV steel with 0.008 wt.% B and 0.003 wt.% N additions was studied at a temperature of 650 °C. Decreasing the strain rate and increasing the strain amplitude was demonstrated to reduce the resistance of the 10%Cr steel to cyclic softening due to facilitating the transformation of the temper...
9 CitationsSource