Effects of Laves phase particles on recovery and recrystallization behaviors of Nb-containing FeCrAl alloys

Sun, Zhiqian; Edmondson, Philip D.; Yamamoto, Yukinori

doi:10.1016/j.actamat.2017.11.027

Cited by 130 publications

(33 citation statements)

References 49 publications

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“…This difference indicates the effect of microstructure stability caused by fine precipitation particles with a nanoscale size. Sun pointed out that the microstructure stability of FeCrAl alloys was aroused by the fine nano-particles, which effectively pinned the movement of sub-boundaries at high temperature [10]. With further increasing deformation reduction, S3 shows a totally different microstructure, where only fine and uniformly distributed precipitation nano-particles were formed throughout the matrix, although a few particle clusters were found.…”

Section: Resultsmentioning

confidence: 99%

“…It has been demonstrated that the Al 2 O 3 film can be stable up to 1400 °C, which will extremely improve the oxidation resistance of cladding under the normal operation conditions or under a LOCA [9]. Besides, microalloy elements such as Mo and Nb can be added to improve the mechanical properties and microstructure stability of FeCrAl alloy cladding when used in a high temperature environment [10,11]. Currently, one of the main works in this field is focused on composition optimization, in order to maximize the aqueous corrosion resistance, high-temperature oxidation resistance, and mechanical properties of FeCrAl-based alloys, while FeCrAl alloys still maintain reasonable performance in terms of their processability, neutronics economy, and radiation tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain excellent deformability (final size of FeCrAl cladding: 9.5 mm in outer diameter and ~0.35–0.37 mm in thickness) and various mechanical properties (such as yield strength, fatigue, and creep deformation resistance), microstructure control is key for FeCrAl-based alloys, and the control of Laves phase particles is the main focus here [12,13]. In FeCrAl alloys, fine and uniformly distributed Laves particles can result in precipitation strengthening and enhance the microstructure stability and mechanical properties [10]. However, due to the high Al and Cr content, FeCrAl alloys have a body-centered cubic (BCC) structure up to their melting temperature, eliminating the chance of grain refinement and solution by the phase transformation that occurs in Zr alloys and carbon steels.…”

Section: Introductionmentioning

confidence: 99%

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Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing

Zheng

Jia

et al. 2019

Materials

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In recent years, the development of nuclear grade FeCrAl-based alloys with enhanced accident tolerance has been carried out for light water reactor (LWR) fuel cladding to serve as a substitute for zirconium-based alloys. To achieve excellent microstructure stability and mechanical properties, the control of precipitation particles is critical for application of FeCrAl-based alloys. In this paper, the effect of thermomechanical processing on the microstructure and precipitation behavior of hot-rolled FeCrAl alloy plates was examined. After hot rolling, the FeCrAl alloy plates had typical deformation textures. The rolling direction (RD) orientation gradually rotated from <100> to <110> along with increasing reduction. Shear bands and cell structures were formed in the matrix, and the former acted as preferable nucleation sites for crystallization. Improved deformation helped to produce strain-induced precipitation. The plate with 83% reduction had the most homogeneous and finest precipitation particles. Identification results by TEM indicated that the Laves precipitation was of the Fe2Nb-type crystal structure type, with impurities including Mo, Cr, and Si. The plate with uniform Laves particles displayed favorable heat stability after a long period of aging at 800 °C. The microstructure evolution of the aged sample was also observed. The deformation microstructure and the strain-induced precipitation mechanism of FeCrAl alloys are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing

Zheng

Jia

et al. 2019

Materials

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“…For some special stainless steels (SSs), there also exist other kinds of precipitates, such as Laves phases (Fe 2 M), Ni 3 M, B2-NiAl, σ-FeCr, and Z-CrNbN, to strengthen the FCC or BCC matrix [ 7 ]. For instance, austenitic SSs for the use in high-temperature (600~800 °C) and oxidation environment are generally strengthened by MC, Cr 23 Cr 6 , Z, Fe 2 M, or B2-NiAl [ 80 , 81 ]. However, it is noted that these phases are not coherent with the FCC austenite matrix, which can lead to the coarsening of second phase precipitates, as a final result of softeness or embrittlement (the latter mainly caused by the σ phase).…”

Section: Precipitate Morphology and Precipitation Strengthening Inmentioning

confidence: 99%

Coherent Precipitation and Strengthening in Compositionally Complex Alloys: A Review

Wang

Pang

et al. 2018

Entropy

122

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High-performance conventional engineering materials (including Al alloys, Mg alloys, Cu alloys, stainless steels, Ni superalloys, etc.) and newly-developed high entropy alloys are all compositionally-complex alloys (CCAs). In these CCA systems, the second-phase particles are generally precipitated in their solid-solution matrix, in which the precipitates are diverse and can result in different strengthening effects. The present work aims at generalizing the precipitation behavior and precipitation strengthening in CCAs comprehensively. First of all, the morphology evolution of second-phase particles and precipitation strengthening mechanisms are introduced. Then, the precipitation behaviors in diverse CCA systems are illustrated, especially the coherent precipitation. The relationship between the particle morphology and strengthening effectiveness is discussed. It is addressed that the challenge in the future is to design the stable coherent microstructure in different solid-solution matrices, which will be the most effective approach for the enhancement of alloy strength.

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“…Additions of reactive elements such as Y, Hf, Zr, are also known to improve the oxidation resistance through reduced oxide growth rate and enhancing the adhesion between the protective alumina-scale and the ferrite matrix [16,17]. Such excellent oxidation resistance at elevated temperatures, especially in water-vapor containing environments, is also attractive for applications in various extreme environments, such as accident-tolerant fuel cladding in light water reactors [18,19,20]. On the other hand, the high-temperature creep properties of the alloys are poor because of low creep deformation resistance of the ferritic matrix with body-center-cubic (BCC) structure [21].…”

Section: Alloy Designmentioning

confidence: 99%

Development of Creep-Resistant, Alumina-Forming Ferrous Alloys for High-Temperature Structural Use

Yamamoto

Brady

Muralidharan

et al. 2018

ASME 2018 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries

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This paper overviews recent advances in developing novel alloy design concepts of creep-resistant, alumina-forming Fe-base alloys, including both ferritic and austenitic steels, for high-temperature structural applications in fossil-fired power generation systems. Protective, external alumina-scales offer improved oxidation resistance compared to chromia-scales in steam-containing environments at elevated temperatures. Alloy design utilizes computational thermodynamic tools with compositional guidelines based on experimental results accumulated in the last decade, along with design and control of the second-phase precipitates to maximize high-temperature strengths. The alloys developed to date, including ferritic (Fe-Cr-Al-Nb-W base) and austenitic (Fe-Cr-Ni-Al-Nb base) alloys, successfully incorporated the balanced properties of steam/water vapor-oxidation and/or ash-corrosion resistance and improved creep strength. Development of cast alumina-forming austenitic (AFA) stainless steel alloys is also in progress with successful improvement of higher temperature capability targeting up to ∼1100°C. Current alloy design approach and developmental efforts with guidance of computational tools were found to be beneficial for further development of the new heat resistant steel alloys for various extreme environments.

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Effects of Laves phase particles on recovery and recrystallization behaviors of Nb-containing FeCrAl alloys

Cited by 130 publications

References 49 publications

Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing

Control of Laves Precipitation in a FeCrAl-based Alloy Through Severe Thermomechanical Processing

Coherent Precipitation and Strengthening in Compositionally Complex Alloys: A Review

Development of Creep-Resistant, Alumina-Forming Ferrous Alloys for High-Temperature Structural Use

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