Microstructural Analysis of Orientation-Dependent Recovery and Recrystallization in a Modified 9Cr-1Mo Steel Deformed by Compression at a High Strain Rate

Zhang, Zhenbo; Zhang, Yubin; Mishin, Oleg; Tao, Nengguo; Pantleon, Wolfgang; Jensen, D. Juul

doi:10.1007/s11661-016-3626-0

Cited by 19 publications

(13 citation statements)

References 34 publications

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“…The stored energy becomes marginal relief within each deformed grains at this annealing temperature (520°C), which implies the occurrence of recovery in the form of substructure evolution ( figure 4(b)). The present results are consistent with the literature reported by Zhang et al for 9Cr-1Mo deformed steel [34]. They have explained that the material first recovers and coarsens during annealing, which induces softening and reducing in stored energy.…”

Section: Microstructural Evolutionsupporting

confidence: 93%

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

Dutta

Panda

Mitra

et al. 2020

Mater. Res. Express

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The recovery and recrystallization kinetics of 80% cold rolled ultra low carbon steel are investigated during isothermally annealing for temperature ranges 350-640°C as a function of different annealing time. The recovery is assessed by magnetic coercivity (Hc), while the recrystallization is determined by mechanical hardness. At low temperature (350 to 520°C) annealing, recovery dominates for long time (∼12 000 s), while the annealing at 550°C/ 900s and 580°C/ 300s causes the recrystallized nuclei formation . The recovery kinetics is introduced by differential rate equation, explaining the reduction in coercivity with the recovery progress and the variation of an activation energy from 41-113 kJ mol −1 . The recrystallization kinetics is found faster at high annealing temperature 640°C than 550 and 580°C based on hardness measurement, justifying by apparent activation energy within 114-190 kJ mol −1 . Furthermore, the recovery and recrystallization rate increase with different annealing time, consistent to the change of microstructures and grain boundary characteristics evaluated by the orientation imaging microscopy (OIM) of electron backscattered diffraction (EBSD).

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Section: Microstructural Evolutionsupporting

confidence: 93%

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

Dutta

Panda

Mitra

et al. 2020

Mater. Res. Express

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show abstract

“…In theory, recovery primarily affects nucleation and dislocation activity within the deformation grain. The annihilation and rearrangement of dislocations and the disappearance of point defects during recovery can greatly reduce the amount of stored energy [27] and adjust the dislocation alignment, which can affect the nucleation. Many subgrains with {111} orientation appear in the {111} deformed matrix, due to its high stored energy and preferential nucleation sites (i.e., strong {111}<uvw> rolling texture) in the center layer, and gradually grow into the effective {111} recrystallized nucleus when annealed at low temperature.…”

Section: The Effect Of Annealing Temperature On Recrystallization Micmentioning

confidence: 99%

The Effect of Different Annealing Temperatures on Recrystallization Microstructure and Texture of Clock-Rolled Tantalum Plates with Strong Texture Gradient

Zhu

Liu

Yang

et al. 2019

Metals

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The texture and the bulk stored energy along the thickness direction were extremely inhomogeneous in the clock-rolled tantalum sheets with 70% reduction. Therefore, the effects of different annealing temperatures on the microstructure and texture distribution of tantalum plates through the thickness were investigated by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The results showed that the occurrence of strong {111} recrystallization texture in the center layer can be attributed to the subgrains nucleation mechanism when annealed at the low temperature. Many subgrains with {111} orientation appeared in the center layer, due to its high stored energy and preferential nucleation sites of the {111} deformed matrix, and rapidly grew into the effective nucleus, resulting in the large {111} grain size and strong {111} texture after complete recrystallization. Contrarily, at the high temperature, high-angle grain boundaries had sufficient driving force to generate migration, due to the lack of recovery, and the growth time of recrystallized nucleus was much shorter, contributing to relatively uniform recrystallization microstructure and texture distribution along the thickness.

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“…Recovery, either prior to the onset of recrystallization or otherwise taking place concurrently with recrystallization, typically leads to structural coarsening, which can substantially modify the local microstructure [20,[33][34][35]. Such coarsening is expected to be more pronounced in HMRs than in LMRs as the former contain a greater frequency of highly mobile HABs.…”

Section: Influence Of the Stored Energymentioning

confidence: 99%

The influence of multiscale heterogeneity on recrystallization in nickel processed by accumulative roll bonding

2016

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Microscopic and sample-scale heterogeneities have been characterized in nickel processed by accumulative roll bonding to a von Mises strain of 4.8, and their influence on recrystallization has been analyzed. The microscopic heterogeneities in this material are mostly associated with regions near the bonding interface, which are more refined and thus possess a higher stored energy than other regions. These regions also contain characteristic particle deformation zones around fragments of the steel wire brush used to prepare the surface for bonding. The sample-scale heterogeneities are seen as variations in the distribution of different texture components and in the fractions of high misorientation regions between the subsurface, intermediate and center layers. Each of these heterogeneities affects the progress of recrystallization. Regions near bonding interfaces, particle deformation zones and shear bands are all found to act as preferential nucleation sites. On the sample scale, recrystallization proceeds faster in the intermediate layer than in the center and subsurface layers. Comparing the progress of recrystallization in ARB-processed nickel and conventionally rolled nickel, it is evident that * Corresponding author: e-mail: olmi@dtu.dk 1 additional deformation heterogeneities induced by ARB result in nucleation taking place over a more extended period of time.

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Microstructural Analysis of Orientation-Dependent Recovery and Recrystallization in a Modified 9Cr-1Mo Steel Deformed by Compression at a High Strain Rate

Cited by 19 publications

References 34 publications

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

The Effect of Different Annealing Temperatures on Recrystallization Microstructure and Texture of Clock-Rolled Tantalum Plates with Strong Texture Gradient

The influence of multiscale heterogeneity on recrystallization in nickel processed by accumulative roll bonding

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