Effect of tantalum on short-term creep of a 12%Cr-3%Co-0.07%Ta martensitic steel for steam blades

Published on May 28, 2020
· DOI :10.1088/1757-899X/848/1/012020
Alexandra Fedoseeva10
Estimated H-index: 10
,
Ivan Nikitin2
Estimated H-index: 2
+ 2 AuthorsRustam Kaibyshev58
Estimated H-index: 58
Source
Abstract
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References24
Newest
#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
#1Alexandra FedoseevaH-Index: 10
#2Nadezhda DudovaH-Index: 13
Last. Andrey BelyakovH-Index: 41
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The effect of increasing tungsten content from 2 to 3 wt % on the creep rupture strength of a 3 wt % Co-modified P92-type steel was studied. Creep tests were carried out at a temperature of 650 °C under applied stresses ranging from 100 to 220 MPa with a step of 20 MPa. It was found that an increase in W content from 2 to 3 wt % resulted in a +15% and +14% increase in the creep rupture strength in the short-term region (up to 103 h) and long-term one (up to 104 h), respectively. On the other han...
17 CitationsSource
The effect of stresses on the microstructure and dispersed particles in a heating-performance Fe‒0.12C–0.06Si–0.04Ni–0.2Mn–9.5Cr–3.2Co–0.45Mo–3.1W–0.2V–0.06Nb–0.005B–0.05N (wt %) steel has been studied under long-term strength tests at Т = 650°C under initial applied stresses ranging from 220 to 100 MPa with a step of 20 MPa. Under an applied stress of 160 MPa, which corresponds to a time to fracture of 1703 h, a transfer from short- to long-term creep takes place. It has been shown that alloyin...
16 CitationsSource
#1Masatoshi Mitsuhara (Kyushu University)H-Index: 15
#2Shigeto Yamasaki (Kyushu University)H-Index: 7
Last. Akihiro KanayaH-Index: 6
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AbstractThe interactions between dislocations and lath boundaries in Grade 91 steel were observed by an in situ transmission electron microscopy tensile test at 973 K. Dislocations glided slowly and bowed out in a martensite lath interior. The ends of the dislocation were connected to the lath boundaries. In a tempered specimen, the pinning stress caused by the lath boundary was estimated to be >70 MPa with a lath width of 0.4 μm. In crept specimens, lath coarsening reduced the pinning effect.
22 CitationsSource
#1Hilmar Kjartansson Danielsen (DTU: Technical University of Denmark)H-Index: 18
For high temperature applications, 9–12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)N Z phase. The Z phases lowly replace MX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9–12 wt-%Cr steels including thermodynamic modelling, crystal structure, nucleation pro...
34 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
Creep strength improvements of martensitic 9 % Cr steels have been obtained by controlled additions of V, Nb, N and B to the steels, which resulted in precipitation hardening by fine stable nitrides based on V and Nb as well as in stabilization of Cr carbides against coarsening. The best steels P92 and FB2 are now used in power plants up to 600–620 °C steam temperature. For higher steam temperatures up to 650 °C steels with 11–12 % Cr are needed for better resistance against steam oxidation. How...
14 CitationsSource
#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 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...
14 CitationsSource
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...
15 CitationsSource
The creep behavior, deformation mechanisms, and the correlation between creep deformation parameters and creep life have been investigated for Mod.9Cr-1Mo steel (Gr.91, 9Cr-1Mo-VNb) by analyzing creep strain data at 723 K to 998 K (450 °C to 725 °C), 40 to 450 MPa, and t r = 11.4 to 68,755 hours in NIMS Creep Data Sheet. The time to rupture t r is reasonably correlated with the minimum creep rate \( {\dot{\varepsilon }}_{ \hbox{min} } \) and the acceleration of creep rate by strain in the accele...
48 CitationsSource
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#1E. TkachevH-Index: 6
#2Andrey BelyakovH-Index: 41
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