Grain Boundary Assemblies in Dynamically-Recrystallized Austenitic Stainless Steel

Tikhonova, Marina; Dolzhenko, Pavel; Kaibyshev, Rustam; Belyakov, Andrey

doi:10.3390/met6110268

Cited by 11 publications

(16 citation statements)

References 36 publications

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“…A detailed analysis of the misorientation angle distributions by EBSD with the aim to estimate the amount of low-angle boundaries (LABs) (θ = 2°–5°) [ 33 ] and high-angle boundaries (HABs) (θ > 15°) [ 34 ] has been carried out. Figure 7 and Figure 8 show the histograms of LABs and HABs volume fractions (defined as the ratio between LABs length (or HABs) and the total grain boundary length, mm/mm * 100) as a function of the analyzed zone.…”

Section: Resultsmentioning

confidence: 99%

Strain Evolution in Cold-Warm Forged Steel Components Studied by Means of EBSD Technique

Ferro

Bonollo

Bassan³

et al. 2017

Materials

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Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning Electron Microscopy (FEG-ESEM) has been used to evaluate the microstructural and local plastic strain evolution in different alloys (AISI 1005, AISI 304L and Duplex 2205) deformed by a single-stage cold and warm forging process. The present work is aimed to describe the different behavior of the austenite and ferrite during plastic deformation as a function of different forging temperatures. Several topological EBSD maps have been measured on the deformed and undeformed states. Then, image quality factor, distributions of the grain size and misorientation have been analyzed in detail. In the austenitic stainless steel, the γ-phase has been found to harden more easily, then α-phase and γ-phase in AISI 1005 and in duplex stainless steel, sequentially. Compared to the high fraction of continuous dynamic recrystallized austenitic zones observed in stainless steels samples forged at low temperatures, the austenitic microstructure of samples forged at higher temperatures, 600–700 °C, has been found to be mainly characterized by large and elongated grains with some colonies of fine nearly-equiaxed grains attributed to discontinuous dynamic recrystallization.

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Section: Resultsmentioning

confidence: 99%

Strain Evolution in Cold-Warm Forged Steel Components Studied by Means of EBSD Technique

Ferro

Bonollo

Bassan³

et al. 2017

Materials

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“…rest of the sub-boundary is still in the range of low-angle misorientations [2,31]. On the other hand, numerous annealing twins (some of them are indicated by white lines in Figure 8) suggest frequent grain boundary migration, which is a typical feature of a discontinuous DRX [2,32,33]. Thus, the DRX microstructures evolved under warm working conditions result from the concurrent operation of both discontinuous and continuous DRX mechanisms.…”

Section: Drx Mechanismsmentioning

confidence: 99%

Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

Dolzhenko

Tikhonova

Kaibyshev

et al. 2019

Metals

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The deformation microstructures and mechanical properties were studied in a high-Mn steel subjected to hot compression. The deformation microstructures resulted from the development of dynamic recrystallization (DRX). Two DRX mechanisms, namely discontinuous and continuous, operated during warm-to-hot working. Under the conditions of hot working when the flow stresses were below 100 MPa, a power law function was obtained between the DRX grain size and the true flow stress with a grain size exponent of −0.8 owing to the discontinuous DRX. On the other hand, the gradual change in the operating DRX mechanism from a discontinuous to continuous one upon a transition from hot to warm working, when the true flow stress increases above 100 MPa, resulted in the grain size exponent of about −0.5 in the power law between the flow stress and the DRX grain size. The DRX microstructures developed by warm-to-hot working provide a beneficial combination of mechanical properties including high ultimate tensile strength in the range of 700–900 MPa and sufficient ductility with a uniform elongation well above 50%. The strengthening of the samples with DRX microstructures was attributed to the combined effect of the grain size and dislocation strengthening resulting in a rather high grain boundary strengthening factor of 570 MPa μm0.5 in the Hall-Petch-type relationship.

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“…The deformation temperature significantly affects both the strain-induced grain size and the kinetics of microstructure evolution. Decreasing the deformation temperature results in a decrease in the mean grain size evolved at large strains under conditions of warm-to-hot working (Figure 15) [106]. The new grains rapidly develop during hot deformation, owing to discontinuous DRX (annealing twins in Figure 15 are indicative of this DRX mechanism).…”

Section: Temperature Effectmentioning

confidence: 99%

Microstructures and Mechanical Properties of Steels and Alloys Subjected to Large-Strain Cold-to-Warm Deformation

Dolzhenko

Tikhonova

Kaibyshev

et al. 2022

Metals

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The effect of large-strain cold-to-warm deformation on the microstructures and mechanical properties of various steels and alloys is critically reviewed. The review is mainly focused on the microstructure evolution, whereas the deformation textures are cursorily considered without detailed examination. The deformation microstructures are considered in a wide strain range, from early straining to severe deformations. Such an approach offers a clearer view of how the deformation mechanisms affect the structural changes leading to the final microstructures evolved in large strains. The general regularities of microstructure evolution are shown for different deformation methods, including conventional rolling/swaging and special techniques, such as equal channel angular pressing or torsion under high pressure. The microstructural changes during deformations under different processing conditions are considered as functions of total strain. Then, some important mutual relationships between the microstructural parameters, e.g., grain size vs. dislocation density, are revealed and discussed. Particular attention is paid to the mechanisms of microstructure evolution that are responsible for the grain refinement. The development of an ultrafine-grained microstructure during large strain deformation is considered in terms of continuous dynamic recrystallization. The regularities of the latter are discussed in comparison with conventional (discontinuous) dynamic recrystallization and grain subdivision (fragmentation) phenomenon. The structure–property relations are quantitatively represented for the structural strengthening, taking into account various mechanisms of dislocation retardation.

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Grain Boundary Assemblies in Dynamically-Recrystallized Austenitic Stainless Steel

Cited by 11 publications

References 36 publications

Strain Evolution in Cold-Warm Forged Steel Components Studied by Means of EBSD Technique

Strain Evolution in Cold-Warm Forged Steel Components Studied by Means of EBSD Technique

Dynamically Recrystallized Microstructures, Textures, and Tensile Properties of a Hot Worked High-Mn Steel

Microstructures and Mechanical Properties of Steels and Alloys Subjected to Large-Strain Cold-to-Warm Deformation

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