2019
DOI: 10.1007/s11661-019-05525-1
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Design and Characterization of a Heat-Resistant Ferritic Steel Strengthened by MX Precipitates

Abstract: The long-term performance of current heat-resistant ferritic steels used in steam generators is primarily limited by microstructure degradation as a result of coarsening or transformation of precipitates. To improve the microstructural stability, a heat-resistant ferritic steel was designed via computational thermodynamics to exclusively contain metal carbonitride (MX) precipitates as the primary means for strengthening at elevated temperatures. The volume fraction of precipitates is 0.35 vol pct, about one-se… Show more

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Cited by 16 publications
(7 citation statements)
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“…where d MX and d α are the interplanar spacing of the particle and ferritic matrix, respectively. If a carbonitride exhibits a plate-like shape along (001) α broad faces with square-like cross-section its misfit, δ, is ≤ 3% that provides coherency of these interfaces with interfacial energy of ~0.5 J m − 2 [26,[68][69][70]. VX carbonitrides having plate-like shape precipitate during tempering in this steel [6,34,36,50,51].…”
Section: Tablementioning
confidence: 93%
“…where d MX and d α are the interplanar spacing of the particle and ferritic matrix, respectively. If a carbonitride exhibits a plate-like shape along (001) α broad faces with square-like cross-section its misfit, δ, is ≤ 3% that provides coherency of these interfaces with interfacial energy of ~0.5 J m − 2 [26,[68][69][70]. VX carbonitrides having plate-like shape precipitate during tempering in this steel [6,34,36,50,51].…”
Section: Tablementioning
confidence: 93%
“…With the increase of aging temperature and aging time, the precipitates on grain boundary begin to gather, the size of precipitates in grain becomes larger and the coherent relationship with matrix is lost. On the one hand, the crystal structure of the coarse intermetallic compound is different from that of the matrix, so it is easy to produce the uncoordinated deformation in the plastic deformation, resulting in the stress concentration at the interface between the intermetallic compound and the matrix, forming the crack source [40,41]. On the other hand, the mechanism of dislocation slip changes from shear to bypass.…”
Section: Effect Of Precipitates On Mechanical Propertiesmentioning
confidence: 99%
“…[ 1,2 ] The 9–12% chromium ferritic/martensitic steels are ideal for constructing advanced USC power plants because of their enhanced thermophysical properties, high creep strength, and low cost. [ 3,4 ] The microstructure of 9–12% chromium martensitic steels is complex. The steels are composed of prior‐austenite grains, martensitic laths and blocks, and several precipitated phases.…”
Section: Introductionmentioning
confidence: 99%
“…
Fossil power plants operating at ultrasupercritical (USC) temperatures must be constructed with enhanced heat-resistant materials with creep strengths that can withstand temperatures above 600 C. [1,2] The 9-12% chromium ferritic/martensitic steels are ideal for constructing advanced USC power plants because of their enhanced thermophysical properties, high creep strength, and low cost. [3,4] The microstructure of 9-12% chromium martensitic steels is complex. The steels are composed of prior-austenite grains, martensitic laths and blocks, and several precipitated phases.
…”
mentioning
confidence: 99%