Effect of Lanthanum on the Precipitation of NbC in Ferritic Steels

Wang, Haiyan; Gao, Xueyun; Mao, Weimin; Zhu, Guowei; Chen, Shuming; Ren, Huiping

doi:10.2355/isijinternational.isijint-2016-132

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Despite the progress so far in RE alloying steel, the thorough theoretical study on the effect of RE on the precipitation of NbC is seldom detailed. The effect of lanthanum on the diffusivity of Nb and then the precipitation of NbC in ferritic steels was previously predicted and reported from our group [25].…”

Section: Introductionmentioning

confidence: 70%

Effect of lanthanum on the precipitation of NbC in bcc Fe

Gao

Ren

Wang

et al. 2017

Materials Science and Technology

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The effect of lanthanum on the precipitation of NbC in bcc Fe has been investigated by the first-principles calculations in combination with the experiments. The interactions of La–C are repulsive in the first-, second- and third-nearest-neighbour configurations, and the binding energies of La with Nb were predicted to be positive, and converge to a weak value. The addition of La decreases the solubility of C (above 763 K) and Nb, and increases the chemical potential of these two solutes, thus promoting the precipitation of NbC in bcc Fe. The experimental results show that the La-contained Nb-bearing steel has a relatively faster precipitation rate of NbC than the La-free steel, during isothermal treatment in ferritic region.

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Section: Introductionmentioning

confidence: 70%

Effect of lanthanum on the precipitation of NbC in bcc Fe

Gao

Ren

Wang

et al. 2017

Materials Science and Technology

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“…13) For the case of NbC precipitation in ferrite steels, our diffusion couple experiment reveals that Nb diffuses slightly faster in the presence of La, and consequently leads to the faster precipitation kinetics of NbC. 14) Despite the progress in RE containing steels research so far, it still remains to be investigated, since La generally cannot be detected directly in steels by conventional experimental methods due to its low solubility in steel. Although the advances in computational hardware and algorithms allow the application of first-principle calculations to the related investigation, it is beyond the capability of ab initio method in the case of precipitation and dissolution of NbC processes which involve long-ranged strain fields, long-ranged composition fluctuations and large numbers of atoms.…”

Section: Introductionmentioning

confidence: 94%

Molecular Dynamics Investigation of the Effect of Lanthanum on the Diffusivity of Niobium in Austenite

et al. 2018

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By employing the force-matching method, an embedded-atom-method potential for FeNbLa dilute solid solution has been constructed by fitting to a set of density-functional theory (DFT) data of reference structures. The developed potential reproduces the properties of the reference structures in good agreement. Using the developed potential, molecular dynamics simulations were performed to investigate the diffusion coefficients of Nb in FeNb and FeNbLa systems, respectively. The results indicate that the addition of La suppresses the diffusion of Nb in fcc Fe, the activation energy of Nb was determined to be 47551 J/mol in the absence of La while 82672 J/mol in the presence of La, and consequently leads to the longer incubation time of NbC precipitation in the La micro-alloyed austenite.

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“…Through the utilization of the Kissinger method and analytical model calculations, it was demonstrated that the inclusion of rare earth Sm lowered the activation energy required for the formation of the θ ' precipitated phase, thereby promoting its formation. Employing the first‐principle calculation based on the density functional theory (DFT), Wang et al [ 24 ] conducted a systematically investigation into the impact of rare earth elements on the dissolution and precipitation behavior of niobium carbide in microalloy steel. Their findings indicated that the introduction of rare earth elements would change the solubility product of C and Nb in steel, reduce the activation energy required for NbC precipitation, enhance the diffusion coefficient of Nb within ferrite, and promote the precipitation of secondary phases.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rare Earth Y on the Inhibitor Precipitation Behavior of Strip‐Cast Grain‐Oriented Silicon Steel

Wang,

Zhang

et al. 2024

steel research int.

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0.3 mm‐thick grain‐oriented silicon steel sheets with varying Y contents are produced via twin‐roll strip‐casting and two‐stage cold rolling process. This study primarily investigates the evolution of microstructure, texture, and precipitation along the processing. Specifically, the effect of rare earth Y on second‐phase particle precipitation in ultralow carbon grain‐oriented silicon steel is examined. Results indicate that higher Y content will consume beneficial inhibitor elements such as S and N, leading to the formation of coarse rare earth inclusions (≈10 μm) in the cast strip. This significantly diminishes inhibition ability and magnetic induction (B8 = 1.58 T≈1.71 T). On the contrary, the addition of trace Y can accelerate the precipitation of inhibitors. During the intermediate annealing stage, steel with trace Y exhibits a significant enhancement in precipitate distribution density (from 2.8 μm−2 to 13.6 μm−2), and the final magnetic induction B8 increases from 1.86 T to 1.91 T compared to steel without Y. In addition, the results of first‐principle calculations based on density functional theory reveal that the doped Y atom prefers to segregate at the Al–N interface, and the interface energy reduces from 1.871 J m−2 to 1.024 J m−2, thereby promoting the precipitation of AlN.

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Effect of Lanthanum on the Precipitation of NbC in Ferritic Steels

Cited by 7 publications

References 33 publications

Effect of lanthanum on the precipitation of NbC in bcc Fe

Effect of lanthanum on the precipitation of NbC in bcc Fe

Molecular Dynamics Investigation of the Effect of Lanthanum on the Diffusivity of Niobium in Austenite

The Effect of Rare Earth Y on the Inhibitor Precipitation Behavior of Strip‐Cast Grain‐Oriented Silicon Steel

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