On the direct nucleation and growth of ferrite and cementite without austenite

Fillon, A.; Sauvage, Xavier; Lawrence, B. St.; Sinclair, Chad W.; Perez, Michel; Weck, Arnaud; Cantergiani, Elisa; Épicier, Thierry; Scott, Colin

doi:10.1016/j.scriptamat.2014.09.025

Cited by 12 publications

(11 citation statements)

References 19 publications

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“…that the growth process is reconstructive in nature. This would require the diffusion of iron atoms, and indeed, the rate of transformation is found to be slower than expected from the diffusion of carbon alone [192].…”

Section: Cementite Precipitation In Metallic Glassmentioning

confidence: 91%

“…Amorphous alloys of iron precipitate cementite when their carbon concentration is sufficiently large; it is difficult to be specific because there is no phase diagram relating to the equilibrium between cementite and the glassy alloy or even whether an equilibrium mixture of glass and cementite is possible. Figure 30 shows cementite and ferrite obtained by the devitrification of a binary glassy-steel 500 nm thick film during heat treatment at just 300 • C. It is not clear why the cementite is heavily faulted but its shape indicates and equiaxed ferrite, crystallised from metallic glass films of composition Fe-13.6C at.-% by heat treatment at 300 • C for 3 h. Reproduced from Fillon et al [192] with permission from Elsevier.…”

Section: Cementite Precipitation In Metallic Glassmentioning

confidence: 99%

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Cementite

Bhadeshia

2019

International Materials Reviews

103

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Cementite occurs in steels, in meteorites, possibly at the core of the Earth and has uses in its pure form. It's composition can deviate from Fe 3 C, but not by much because the Fe-C bond contributes to its cohesion. Its crystallographic unit cell is orthorhombic and primitive, with large lattice parameters, explaining its hardness. Many of its properties are anisotropic. Its single-crystal elastic properties have been investigated using first-principles calculations and by clever experiments. The iron atoms in the cell occupy two types of positions with different point symmetries; the four carbon atoms lodge within prismatic interstices. The structure can develop defects such as dislocations, faults and vacancies. Cementite is metallic and ferromagnetic with a Curie temperature of about 187 • C. When alloyed, metallic solutes substitute on to the iron sites; smaller atoms such as boron replace carbon at interstitial sites. This review focuses on cementite as a single phase.

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Section: Cementite Precipitation In Metallic Glassmentioning

confidence: 91%

Section: Cementite Precipitation In Metallic Glassmentioning

confidence: 99%

Cementite

Bhadeshia

2019

International Materials Reviews

103

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“…S1: Frequency distribution histograms showing the distribution of the B, Nb and Y concentrations measured in 1x1x1nm 3 sampling volumes in an APT data set collected in the as quenched state of the metallic glass. Real data ("Measured") are compared to distributions calculated after a full randomization ("Randomized") of the nature of each atom.…”

Section: Supplementary Data S1mentioning

confidence: 99%

“…However, since these properties are connected to their amorphous structure, the thermal stability and especially the crystallization process upon annealing beyond the glass transition temperature is extremely important. It is well known that during primary crystallization, the partitioning of alloying elements plays a key role on both the nucleation and the growth mechanisms [3][4]. They are mainly controlled by the atomic mobility in the amorphous phase which could give rise to concentration gradients near crystal/amorphous interface boundaries.…”

Section: Introductionmentioning

confidence: 99%

Multiscale investigation of the crystallization mechanisms and solute redistribution during annealing of a Fe64B24Y4Nb6Al0.4 metallic glass

Avettand-Fènoël

Sauvage

Marinova

et al. 2021

Journal of Alloys and Compounds

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The mechanisms and the sequence of crystallization of a Fe 64 B 24 Y 4 Nb 6 Al 0.4 metallic glass were investigated experimentally. To this end, the microstructure of the metallic glass after interrupted isothermal treatments at a temperature between glass transition and primary crystallization was studied by complementary techniques, namely atom probe tomography, transmission electron microscopy and X-ray diffractometry. During the early stages of crystallization of the glass, some nanometric (Fe,Nb)B crystals nucleate first by rejecting Y at their interface, which hinders their growth. The Fe 62 B 14 Y 3 dendritic phase starts growing in a second step. Longer annealings lead to the development of chemical gradients in the amorphous matrix surrounding Fe 62 B 14 Y 3 crystals, which favors the nucleation of additional nanometric (Fe,Nb) 2.4 B crystals.

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“…For the ultra-pure ferritic stainless steel, no phase transformation occurs. Atomic diffusion and grain boundary migration are the main grain growth mechanisms [10,11]. Research on the grain growth of ferritic stainless steel also has been reported.…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Thermal Analysis and Grain Growth Behavior of HAZ on Argon Tungsten-Arc Welding of 443 Stainless Steel

Wang

Deng

Zheng

et al. 2016

Metals

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This paper presents a numerical and infrared experimental study of thermal and grain growth behavior during argon tungsten arc welding of 443 stainless steel. A 3D finite element model was proposed to simulate the welding process. The simulations were carried out via the Ansys Parametric Design Language (APDL) available in the finite-element code, ANSYS. To validate the simulation accuracy, a series of experiments using a fully-automated welding process was conducted. The results of the numerical analysis show that the simulation weld bead size and the experiment results have good agreement. The grain growth in the heat-affected zone of 443 stainless steel is influenced via three factors: (1) the thermal cycle experienced; (2) grain boundary migration; and (3) particle precipitation. Grain boundary migration is the main factor. The modified coefficient k of the grain growth index is calculated. The value is 1.16. Moreover, the microhardness of the weld bead softened slightly compared to the base metal.

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On the direct nucleation and growth of ferrite and cementite without austenite

Cited by 12 publications

References 19 publications

Cementite

Cementite

Multiscale investigation of the crystallization mechanisms and solute redistribution during annealing of a Fe64B24Y4Nb6Al0.4 metallic glass

Finite-Element Thermal Analysis and Grain Growth Behavior of HAZ on Argon Tungsten-Arc Welding of 443 Stainless Steel

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