Precipitation behavior and age hardening effect of the precipitates in a Fe-13Cr-4Al-2Mo-1.2Nb alloy

Chen, Li; Huang, Xing; He, Kun; Wang, Hui

doi:10.1016/j.matchar.2021.110918

Cited by 24 publications

(9 citation statements)

References 54 publications

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“…Initially, the fine Laves-phase adopt the shape of a needle, maintaining a semi-coherent (or coherent) interface with the matrix. This acts by anchoring the dislocations without causing embrittlement [92,93]. Following the evolution of the precipitate, it loses coherence as it grows, adopting the shape of a rod and then a block, but reinforcement is not achieved to a great extent due to the size reached by the particles [92,94].…”

Section: ¯( )mentioning

confidence: 99%

Laves phase formation in Fe-based alloys from strengthening particle to self-healing agent: a review

Wackerling,

Rojas,

Oñate

et al. 2023

Mater. Res. Express

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In this study, were extensively reviewed the hardening and self-healing properties of Laves-phase in Fe-based alloys. First, the microstructural features of different polytypes of the Laves-phase, focusing on the thermodynamics and kinetics of formation in ferritic and martensitic steels were revised. C14 was identified as the dominant polytype in steels, providing strengthening by precipitation, anchoring of dislocation, and interphase boundaries, thereby increasing the creep resistance. Although the Laves phase is widely known as a reinforcement particle (or even a detrimental phase in some systems) in martensitic/ferritic and ferritic steels, recent findings have uncovered a promising property. Particles with self-healing characteristics provide creep resistance by delaying creep cavities formation. In this regard, different elements such as tungsten and molybdenum are known to provide this feature to binary and tertiary ferrous alloys due to their ability to diffuse into the creep cavities and form Laves-phase Fe(Mo,W)2. To date, self-healing by precipitation has only been reported in commercial stainless steel AISI 312, 347, and 304 modified with boron, nevertheless with a little contribution to creep rupture life. Although, commercial computational tools with thermodynamic and kinetic databases are available for researchers, to tackle the self-healing process with exactitude, genetic algorithms arise as a new tool for computational design. The two properties of Laves phase reported in the literature, precipitation hardening and self-healing agent, is a mix that can bring out a new research field. Therefore, it is not unreasonable to think of tailor-made high chromium creep-resistant steels reinforced by Laves-phase coupled with self-healing properties. However, owing to the characteristic of Laves-phase seems to be a complex challenge, mainly due to the crystallographic features of this phase in comparison with the host matrix, available computational tools, and databases.

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Section: ¯( )mentioning

confidence: 99%

Laves phase formation in Fe-based alloys from strengthening particle to self-healing agent: a review

Wackerling,

Rojas,

Oñate

et al. 2023

Mater. Res. Express

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“…When the precipitate’s size is at the nanoscale, the irradiation point defects, such as vacancy and interstitial atoms, will essentially affect the atoms’ migrations, and then the formation of a Cr-enriched α′ phase will be faster [ 16 , 17 ]. These Cr-enriched α′ nanoscale precipitates can prevent the motion of dislocations, which causes an increase in hardness [ 18 ]; thus, unfavorable thermal embrittlement will be produced [ 19 ]. However, the evolutions of nanoparticles and point defects in Fe–Cr alloys under normal stress and radiation are not clarified.…”

Section: Introductionmentioning

confidence: 99%

Elastic Strain Relaxation of Phase Boundary of α′ Nanoscale Phase Mediated via the Point Defects Loop under Normal Strain

et al. 2023

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Irradiation-induced point defects and applied stress affect the concentration distribution and morphology evolution of the nanophase in Fe–Cr based alloys; the aggregation of point defects and the nanoscale precipitates can intensify the hardness and embrittlement of the alloy. The influence of normal strain on the coevolution of point defects and the Cr-enriched α′ nanophase are studied in Fe-35 at.% Cr alloy by utilizing the multi-phase-field simulation. The clustering of point defects and the splitting of nanoscale particles are clearly presented under normal strain. The defects loop formed at the α/α′ phase interface relaxes the coherent strain between the α/α′ phases, reducing the elongation of the Cr-enriched α′ phase under the normal strains. Furthermore, the point defects enhance the concentration clustering of the α′ phase, and this is more obvious under the compressive strain at high temperature. The larger normal strain can induce the splitting of an α′ nanoparticle with the nonequilibrium concentration in the early precipitation stage. The clustering and migration of point defects provide the diffusion channels of Cr atoms to accelerate the phase separation. The interaction of point defect with the solution atom clusters under normal strain provides an atomic scale view on the microstructure evolution under external stress.

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“…Shassere et al [ 10 ] identified the Fe 2 Nb‐type Laves phase in Nb‐modified Fe–30Cr–3Al alloys, and Sun et al [ 11 ] also reported the Fe 2 Nb‐type Laves phase in Nb‐alloyed FeCrAl alloys. Chen et al [ 12 ] identified the Fe 2 (Mo, Nb)‐type Laves phase in the Mo/Nb co‐modified FeCrAl alloy. In addition to Mo and Nb, Ta was also reported to form the Laves phase.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Precipitation of Laves Phase in FeCrAl Alloy with Zr Addition

Liu

et al. 2023

steel research int.

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FeCrAl alloy is one of potential candidates for accident‐tolerant‐fuel (ATF)‐cladding materials due to its excellent oxidation and corrosion resistance at accident temperature, combining good mechanical properties at service temperature. Alloying strategy is an important way for improving comprehensive properties of FeCrAl alloy through the precipitation of fine Laves phase. Zr alloying can stabilize the Laves phase due to its lower diffusion coefficient and solubility in body‐centered‐cubic ferrite matrix. Herein, it is found that Zr addition changes the dynamic precipitation features of Laves phase in FeCrAl alloy during high‐temperature deformation, from only one type of Fe2M (M = Nb, Mo, Ta) Laves phase to Fe2Zr combining Fe2M‐type Laves phase. The Fe2Zr‐type Laves phase precipitates dynamically first, and the interface precipitates between which with ferrite matrix creates more nucleation sites for subsequent precipitation of Fe2M Laves phase. The results can be possibly applied for alloy design and microstructure tailoring in series of FeCrAl alloys used for ATF cladding in the near future.

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Precipitation behavior and age hardening effect of the precipitates in a Fe-13Cr-4Al-2Mo-1.2Nb alloy

Cited by 24 publications

References 54 publications

Laves phase formation in Fe-based alloys from strengthening particle to self-healing agent: a review

Laves phase formation in Fe-based alloys from strengthening particle to self-healing agent: a review

Elastic Strain Relaxation of Phase Boundary of α′ Nanoscale Phase Mediated via the Point Defects Loop under Normal Strain

Dynamic Precipitation of Laves Phase in FeCrAl Alloy with Zr Addition

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