Stored Energy and Recrystallization Process

Baczmański, Andrzej; Wierzbanowski, K.; Benmarouane, Abdelilah; Lodini, Alain; Lipiński, P.; Bacroix, Brigitte

doi:10.4028/www.scientific.net/msf.539-543.3335

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…The kernel average misorientation (KAM) of a material is proportional to its geometrically necessary dislocation (Koyama et al, 2014b). The higher KAM value of steel B' represents high storage energy, which played a crucial role in the recrystallization process (Baczmanski et al, 2007), steel B showed equiaxed morphology after the subsequent annealing process.…”

Section: Austenite Stabilitymentioning

confidence: 99%

Dependence of hydrogen embrittlement on annealing time in medium-Mn steels

Wang

et al. 2021

ACMM

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Purpose The purpose of this paper is to investigate the effect of the soft annealing time on the microstructure and hydrogen embrittlement (HE) of Fe-0.22C-11.54Mn-2.05Al steels. Design/methodology/approach Steels A and B with different morphologies were prepared by cold rolling after warm rolling, long/short softening annealing and finally annealing at 700 °C for 30 min. Uncharged and charged samples were subjected to tensile, and HE behavior was studied by electron backscattered diffraction, scanning electron microscopy and X-ray diffraction. Findings The two samples exhibited similar tensile strengths. The homogeneous equiaxed microstructure of steel B was found to be more conducive to relieve its HE sensitivity. Steel A exhibited bimodal-grained microstructures – blocky and lath. The formation of crack in the blocky grains of steel A resulted in a significant reduction in its plasticity and tensile strength. Originality/value The high HE susceptibility of steel A is mainly connected with the inhomogeneity of martensite transformation.

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Section: Austenite Stabilitymentioning

confidence: 99%

Dependence of hydrogen embrittlement on annealing time in medium-Mn steels

Wang

et al. 2021

ACMM

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“…Stored energy plays an important role in the recrystallization process, and its contributions can be categorized as elastic energy and dislocation density. Elastic energy relates to residual stress, which is characterized by grain-to-grain interactions, while dislocation density is mainly confined inside the grains [22].…”

Section: • Microstructuresmentioning

confidence: 99%

“…It was found that the stored energy in many AM materials is mainly due to the dislocation density, as the stored energy in the form of residual stress is not on a high enough level to induce recrystallization. Martensitic transformations are sometimes considered as a method to increase the dislocation density inside the material [22]. Lath martensites are typically associated with high dislocation densities, as they can accommodate high strains due to the diffusionless martensitic transformation [24].…”

Section: Residual Stressmentioning

confidence: 99%

Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

et al. 2020

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Additive manufacturing (AM) has recently been accorded considerable interest by manufacturers. Many manufacturing industries, amongst others in the aerospace sector, are already using AM parts or are investing in such manufacturing methods. Important material properties, such as microstructures, residual stress, and surface topography, can be affected by AM processes. In addition, a subtractive manufacturing (SM) process, such as machining, is required for finishing certain parts when accurate tolerances are required. This finish machining will subsequently affect the surface integrity and topography of the material. In this research work, we focused on the surface integrity of Ti-6Al-4V parts manufactured using three different types of AM and finished using an SM step. The aim of this study was to gain an understanding on how each process affects the resulting surface integrity of the material. It was found that each AM process affects the materials’ properties differently and that clear differences exist compared to a reference material manufactured using conventional methods. The newly generated surface was investigated after the SM step and each combination of AM/SM resulted in differences in surface integrity. It was found that different AM processes result in different microstructures which in turn affect surface integrity after the SM process.

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Section: Introductionmentioning

confidence: 99%

“…The stored energy is a fraction of the energy supplied by the external load during deformation; the rest is released as heat [7,8]. The driving force for recrystallization is generally described as the driving pressure [1,9-11]: where α is a constant (typically in the order of 0.5), G is the shear modulus, b is the Burgers vector and ρ is the dislocation density [1,5,12]. The local stored energy can be estimated experimentally by investigating the lattice distortion by synchrotron X-ray diffraction with suitable spatial resolution or electron microscopy, while measuring the heat released from the deformed sample during annealing using calorimetry gives the global stored energy [3,8,13].…”

Section: Introductionmentioning

confidence: 99%

Nucleation of recrystallization

Knipschildt

2022

Materials Science and Technology

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Nucleation of recrystallization in deformed metals is discussed with a focus on how theories have been achieved from experimental investigations. Suggested nucleation mechanisms and potential nucleation sites are reviewed to gain an overall understanding of the state-of-the-art. Limitations in the applied experimental techniques are discussed followed by an analysis of how newly invented non-destructive 3D techniques have challenged accepted theories which are based on 2D studies. Finally, suggestions for further studies by the novel and improved techniques are presented.

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Stored Energy and Recrystallization Process

Cited by 12 publications

References 6 publications

Dependence of hydrogen embrittlement on annealing time in medium-Mn steels

Dependence of hydrogen embrittlement on annealing time in medium-Mn steels

Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

Nucleation of recrystallization

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