Thermomechanical processing route to achieve ultrafine grains in low carbon microalloyed steels

Gong, Peng; Palmiere, E.J.; Rainforth, W. M.

doi:10.1016/j.actamat.2016.08.010

Cited by 66 publications

(29 citation statements)

References 40 publications

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“…The work presented here has shown unambiguously that grain boundary serrations can be induced in the IN600 alloy provided (i) the solutioning temperature is sufficiently high and (ii) if the cooling rate is slow enough. The serration effect found here is quite distinct from that reported in the literature for other systems [25,26,27,28,29] for which significant deformation is needed, associated with bulging of dislocations cell walls or nucleation of nano-sized grains where dynamic recrystallisation had initiated [30,31]. Here, deformation is not required and the serrations may be defined as irregularly shaped architecture with saw/wave-like appearance of a random high angle grain boundary that is produced via heat treatment involving an annealing process.…”

Section: Discussioncontrasting

confidence: 73%

Grain boundary serration in nickel alloy inconel 600: Quantification and mechanisms

et al. 2019

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The serration of grain boundaries in Inconel 600 caused by heat treatment is studied systematically. A new method based on Fourier transforms is used to analyse the multiple wave-like character of the serrated grain boundaries.A new metric -the serration index -is devised and utilised to quantify the degree of serration and more generally to distinguish objectively between serrated and non-serrated boundaries. By considering the variation of the serration index with processing parameters, a causal relationship between degree of serration and solution treatment/cooling rate is elucidated. Processing maps for the degree of serration are presented. Two distinct formation mechanisms arise which rely upon grain boundary interaction with carbides: (i) Zener-type dragging which hinders grain boundary migration and (ii) a faceted carbide growth-induced serration.

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Section: Discussioncontrasting

confidence: 73%

Grain boundary serration in nickel alloy inconel 600: Quantification and mechanisms

et al. 2019

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“…This suggests that the strain-induced boundary migration (SIBM) mechanism was dominant during recrystallisation at 1200°C, as reported by several researchers [23,25,26]. A characteristic feature of this mechanism is that the new grains have similar orientations to the old grains from which they have grown [27]. Therefore, after the first deformation followed by a rapid increase in the temperature to 1200°C, the mechanism of recrystallisation is different from the recrystallisation at 1100°C for both steels, due to the SIBM.…”

Section: Discussionmentioning

confidence: 64%

The effect of thermomechanical controlled processing on recrystallisation and subsequent deformation-induced ferrite transformation textures in microalloyed steels

et al. 2018

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The evolution of texture components for two experimental 0.06 wt% C steels, one containing 0.03 wt% Nb (Nb steel) and the second containing both 0.03 wt% Nb and 0.02 wt% Ti (Nb-Ti steel), was investigated following a new thermomechanical controlled process route, comprising first deformation, rapid reheat to 1200°C and final deformation to various strains. Typical deformation textures were observed after first deformation for both steels. Following subsequent reheating to 1200°C for various times, the recrystallisation textures consisted primarily of the a-011 h i//RD texture fibre with a weak c-{111}//ND texture fibre, similar to deformation textures, indicative of the dominance of a strain-induced boundary migration mechanism. The texture components after finish deformation were different from the rough deformation textures, with a strong a-011 h i//RD texture fibre at the beginning, and then the strong peaks move to (111) 1 21 and (111) 1 12 textures due to the deformation-induced ferrite (DIF) transformation. The effect of Ti on the recrystallisation textures and deformation textures has also been analysed in this study. The results illustrate that Ti significantly influences the c-{111}//ND texture fibre. Finally, the textures after deformation and recrystallisation in the austenite were calculated based on the K-S orientation relationship between the austenite and ferrite. This allowed the understanding of the mechanism of recrystallisation between first and final deformation and the DIF textures during phase transformation.

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“…By controlling the phase size to achieve modification on the performance of structural materials is a crucial part. For solid materials, mechanical plastic deformation and heat treatment (e.g., recrystallization) are commonly used for the grain refinement . Here, we provide a new method called electropulsing to control the particle size.…”

Section: Research Progress In Particle Reconfigurationmentioning

confidence: 99%

Exploring the Particle Reconfiguration in the Metallic Materials under the Pulsed Electric Current

Zhang

Qin²

2018

steel research int.

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The dissolution, refinement, and separation of the particles are one of the core metallurgical processes to control the quality of metallic materials. The dimensional changes and controlled motion of the particles have attracted great attention due to their important contribution to the corrosion resistance, service life, and mechanical properties of metallic materials. In general, the dimensional change of the precipitates is controlled by heat treatment, while the separation or modification of the inclusions is completed by means of filtration, argon blowing, and Ca addition. Sometimes, these methods are inefficient and cannot meet the in situ operation requirement in a particular working environment. This study aims to introduce a new idea of electropulsing metallurgy to achieve direct control for the particles, and this technique is efficient and green. The production of high‐quality steels is achieved by the refinement and separation purification of the inclusions. The regeneration of the aged stainless steel used in nuclear power plant is obtained by the dissolution of precipitates. Therefore, electropulsing metallurgy provides a new technique to control the particle morphology and meets the needs for clean smelting purification and high‐performance metallic materials fabrication. If substantive progress is to be made in this field, some difficulties are highlighted here because the understanding on electropulsing processing is limited.

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Thermomechanical processing route to achieve ultrafine grains in low carbon microalloyed steels

Cited by 66 publications

References 40 publications

Grain boundary serration in nickel alloy inconel 600: Quantification and mechanisms

Grain boundary serration in nickel alloy inconel 600: Quantification and mechanisms

The effect of thermomechanical controlled processing on recrystallisation and subsequent deformation-induced ferrite transformation textures in microalloyed steels

Exploring the Particle Reconfiguration in the Metallic Materials under the Pulsed Electric Current

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