The effect of Nb solute and NbC precipitates on dynamic and metadynamic recrystallisation in Ni-30Fe-Nb-C model alloys

Mannan, Parvez; Casillas, Gilberto; Pereloma, Elena V.

doi:10.1016/j.msea.2017.05.099

Cited by 20 publications

(5 citation statements)

References 52 publications

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“…Nevertheless, the projection of the matrix and the precipitate in the simulated STEM image match the experimental data indicating the presence of interface dislocations. A similar situation was reported for NbC precipitates in an fcc matrix [26] and for (Ti,Mo)C in a bcc matrix [27]; when carbides grew in size, the presence of dislocations was detected. Figure 3 shows the HAADF images of IPs after exsitu tensile deformation to 10% strain and after in-situ nanopillar compression.…”

Section: Resultssupporting

confidence: 80%

Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

Pereloma

Cortie

Singh

et al. 2020

Materials Research Letters

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Section: Resultssupporting

confidence: 80%

Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

Pereloma

Cortie

Singh

et al. 2020

Materials Research Letters

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“…[149] Post-DRX softening and grain growth frequently occur during the intervals between hot working operations in a course of multiple deformations at elevated temperatures, leading to the development of a special microstructure, which is considered as a result of so-called metadynamic recrystallization (MDRX). [10,20,148,[153][154][155][156] The MDRX mechanism involves several concurrent processes including a rapid growth of DRX nuclei, polygonization/coalescence of dislocation substructure, Figure 26. Grain coarsening during annealing at 1073 K of a 304-type ultrafine-grained austenitic stainless steels processed by warm multidirectional forging (MDF) at indicated temperatures (T MDF ).…”

Section: Grain Coarseningmentioning

confidence: 99%

Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

2018

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The effects of dynamic and post-dynamic recrystallization (DRX and post-DRX) on the microstructure and mechanical properties of austenitic stainless steels are critically reviewed. Particularly, the paper is focused on the grain refinement and strengthening by large strain deformation including severe plastic deformation conditions. The DRX and post-DRX microstructures are considered with close relation to the operative recrystallization mechanisms. Specific emphasis is placed upon two recrystallization mechanisms, that is, discontinuous and continuous, and their dependence on the deformation/annealing conditions. The relationships between DRX microstructures and processing conditions are summarized and their effect on post-DRX behavior is clarified. The structural strengthening mechanisms including the grain size and the dislocation density are elaborated.

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“…The precipitation particle size is too small to be detected for the chemical composition, especially Nb, but the images show that the interplanar crystal spacing was between the theoretical values of NbC and TiC, where the measured interplanar crystal spacing was 0.1556 nm for {200} MC and 0.2563 nm for {220} MC , indicating that these particles were the Nb/Ti jointly precipitation particles, namely, (Nb, Ti)C [24]. It was worth noting that the round particles precipitated in the single austenite phase region and obeyed the cube-on-cube parallel orientation relationship, resulting in the spherical particle morphology [29].…”

Section: Effect Of Nb Microalloying On the Haz Softening In Hsla Steelmentioning

confidence: 90%

Effect of Nb Addition and Heat Input on Heat-Affected Zone Softening in High-Strength Low-Alloy Steel

et al. 2022

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The effect of both Nb content and heat input on the softening phenomenon of the heat-affected zone (HAZ) of low-alloy high-strength steel was studied through welding thermal simulation experiments. The microstructure evolution, density variation of geometrically necessary dislocation, microhardness distribution and the second phase precipitation behavior in HAZ was characterized and analyzed by combining the optical microscope, scanning electron microscope, high-resolution transmission electron microscope with microhardness tests. The results showed that the softening appeared in the fine-grain HAZ (FGHAZ) of the low-alloy high-strength steel with the polygonal ferrite and bainite microstructure. With an increase in Nb content, the FGHAZ softening was inhibited even with high heat input; however, the hardness shows little variation. On the one hand, the increase in the Nb content increased the volume fraction of high-strength bainite in the FGHAZ. On the other hand, the remarkable strengthening was produced by the equally distributed precipitation nanoparticles. As a result, the two factors were the main reason for the solution of the FGHAZ softening problem in the low-alloyed high-strength steel with the mixed microstructure of ferrite and bainite.

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The effect of Nb solute and NbC precipitates on dynamic and metadynamic recrystallisation in Ni-30Fe-Nb-C model alloys

Cited by 20 publications

References 52 publications

Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

Uncovering the mechanism of dislocation interaction with nanoscale (<4 nm) interphase precipitates in microalloyed ferritic steels

Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

Effect of Nb Addition and Heat Input on Heat-Affected Zone Softening in High-Strength Low-Alloy Steel

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