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
#1Valeriy Dudko (Belgorod State University)H-Index: 9
#2Alexandra Fedoseeva (Belgorod State University)H-Index: 10
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
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...
10 CitationsSource
#1Alexandra Fedoseeva (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...
The effect of tempering on the mechanical properties and fracture behavior of two 3 pct Co-modified 9 pct Cr steels with 2 and 3 wt pct W was examined. Both steels were ductile in tension tests and tough under impact tests in high-temperature tempered conditions. At T ≤ 923 K (650 °C), the addition of 1 wt pct W led to low toughness and pronounced embrittlement. The 9Cr2W steel was tough after low-temperature tempering up to 723 K (450 °C). At 798 K (525 °C), the decomposition of retained austen...
7 CitationsSource
#1Alexandra FedoseevaH-Index: 10
#2Nadezhda DudovaH-Index: 13
Last. Rustam KaibyshevH-Index: 58
view all 3 authors...
#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 microstructural evolution and the dispersion of secondary phases were studied in a low-nitrogen 10%Cr martensitic steel with 3% Co and 0.008% B additives at 650 °C under an applied stress of 140 MPa. It was demonstrated that the superior creep strength of this steel can be attributed to the high resistance of M 23 C 6 -type carbides and Nb-rich MX carbonitrides against coarsening, resulting in a stable of the tempered martensite lath structure (TMLS) under short-term creep condition...
26 CitationsSource
#1Alexandra Fedoseeva (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...
Microstructural evolution in a 9Cr-3Co-3W-0.2V-0.06Nb-0.05N-0.005B steel crept at T=650°C under an applied stress of 140 MPa up to strains of 1, 3, 5.75 and 12%, which represent primary, secondary and tertiary creep stages and rupture, respectively, was studied. The steel was initially normalized from 1050°C, and finally tempered at 750°C for 3h. After tempering the boundaries of tempered martensite lath structure (TMLS) were decorated by M23C6 carbides, M6C carbides and Laves phase particles. T...
1 CitationsSource
#1Rustam Kaibyshev (Belgorod State University)H-Index: 58
#2R. Mishnev (Belgorod State University)H-Index: 10
Last. Nadezhda Dudova (Belgorod State University)H-Index: 13
view all 4 authors...
Tempered martensite lath structure (TMLS) plays a vital role in creep resistance of high chromium martensitic steels. Under creep conditions the TMLS could be stabilized by three agents: (i) a dispersion of boundary M23C6 carbides and Laves phase; (ii) a dispersion of M(C,N) carbonitrides, which are homogeneously distributed within ferritic matrix; (iii) substitutional alloying element within ferritic matrix. The boundary particles exert a large Zener drag force which effectively hinders migrati...
9 CitationsSource
#1Alexandra Fedoseeva (Belgorod State University)H-Index: 10
#2Nadya Dudova (Belgorod State University)H-Index: 1
Last. Rustam Kaibyshev (Belgorod State University)H-Index: 58
view all 4 authors...
The tempering behaviour of two 9Cr–3Co–0.5Mo–0.2 V–0.05Nb–0.005B steels containing 2 and 3 wt% W was examined. The decomposition of retained austenite induces the formation of semi-continuous films of W-rich M23C6 carbides along boundaries at 525 °C. The increase in W content from 2 to 3 wt% modifies the normal carbide precipitation sequence in the vicinity of these boundaries. The formation of W segregation at prior austenite grain/interlath boundaries leads to formation of the thermodynamicall...
21 CitationsSource
#1Alexandra Fedoseeva (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...
Two 9Cr–3Co–0.5Mo–VNb steels with 2 and 3 wt% W subjected to normalizing at 1050 °C and subsequent tempering at 750 °C for 3 h were crept at 650 °C under applied stresses ranging from 100 to 220 MPa. Both steels exhibit the creep strength breakdown at a rupture time of ~2000 h. The two-phase separation of M(C,N) carbonitrides to Nb- and V-rich particles occurs during tempering. No additional strain-induced coarsening of M(C,N) carbonitrides takes place under creep conditions. Long-term ageing le...
12 CitationsSource
#1Alexandra Fedoseeva (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 and hardness in the grip and gage sections of ruptured 3%Со modified P92 steel specimens were examined after creep tests under applied stresses ranging from 200 to 100 MPa at T =650 °C. Under long-term aging, the depletion of W from solid solution leads to precipitation of the Laves phase. In addition, coarsening of MX carbonitrides occurs after 34 h of aging. The final dimensions of these particles are independent of further aging time. A breakdown of applied stress vs t...
52 CitationsSource
#1Alexandra FedoseevaH-Index: 10
#2Nadezhda DudovaH-Index: 13
Last. Rustam KaibyshevH-Index: 58
view all 3 authors...
Creep strength of martensitic steels under creep conditions is critically dependent on stability of TMLS. Its transformation to well-defined subgrain structure followed by migration of subgrain boundaries corresponds with loss of creep resistance. The onset of migration of lath/subgrain boundaries in a Co-modified P92-type steels upon creep is attributed to a balance between driving and retarding forces. Both driving forces due to high dislocation density within lath interior and energy of low-a...
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