Ferrite Grain Size Distributions in Ultra-Fine-Grained High-Strength Low-Alloy Steel After Controlled Thermomechanical Deformation

Patra, Samir Kumar; Roy, Shibayan; Kumar, Vinod; Haldar, Arunansu; Chakrabarti, Debalay

doi:10.1007/s11661-011-0668-1

Cited by 19 publications

(17 citation statements)

References 39 publications

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“…Research on metallic materials with an ultrafine-grained (UFG) structure (below~2 µm) is constantly being conducted all over the world, because they have improved mechanical and physical properties without the addition of alloying elements [1][2][3][4][5][6][7][8]. The grain size depends on processing parameters such as the deformation temperature, strain, strain rate, and cooling rate [9][10][11]. Of these, the strain introduced in materials by plastic deformation is as important a factor as the deformation temperature for creating UFG structures.…”

Section: Introductionmentioning

confidence: 99%

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

Inoue

Qiu

Ueji

2020

Metals

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The rolling condition for fabricating a low-carbon niobium-microalloyed steel sheet with an ultrafine-grained (UFG) structure was examined through rolling experiments and finite element analysis. A large-diameter rolling process was proposed to create a UFG structure. The rolling was conducted near the transformation point, Ar3, from austenite to ferrite. The Ar3 was measured at the surface and the center of the sheet. First, the through-thickness microstructure and equivalent strain distribution in a 1-pass rolled sheet 2.0 mm thick were examined. In the rolling experiments, the embedded pin method was employed to understand through-thickness deformation. The magnitude of the equivalent strain to obtain a UFG structure was estimated to be 2.0. Based on these results, the fabrication of a 2 mm UFG steel sheet by 3-pass rolling for an initial thickness of 14.5 mm was attempted by the proposed large-diameter rolling process.

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Section: Introductionmentioning

confidence: 99%

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

Inoue

Qiu

Ueji

2020

Metals

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“…Properties such as strength and low-temperature toughness of steel are strongly influenced by the entire ferrite-grain size distribution, a-GSD, [12,13] and hence, grain refinement is characterized not only by the average grain size (a-D AVG ), but also in terms of the largest grain size (a-D MAX ) and the grain size distribution (a-GSD). Compared to the development of macrotexture in steel and its effect on the properties, [13][14][15][16][17] the effect of thermomechanical processing on the ferrite microtexture is less understood [13,14,18] and, hence, is investigated here. Finally, the a-grain sizes, a-GSD, and microtextures obtained from multipass deformations were compared to those obtained from single-pass deformations, as reported in a recent work.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the a-grain sizes, a-GSD, and microtextures obtained from multipass deformations were compared to those obtained from single-pass deformations, as reported in a recent work. [14] II. EXPERIMENTAL DETAILS…”

Section: Introductionmentioning

confidence: 99%

Refinement of Ferrite Grain Size near the Ultrafine Range by Multipass, Thermomechanical Compression

Patra

Neogy

Kumar³

et al. 2012

Metall Mater Trans A

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Plane-strain compression testing was carried out on a Nb-Ti-V microalloyed steel, in a GLEEBLE3500 simulator using a different amount of roughing, intermediate, and finishing deformation over the temperature range of 1373 K to 1073 K (1100°C to 800°C). A decrease in soaking temperature from 1473 K to 1273 K (1200°C to 1000°C) offered marginal refinement in the ferrite (a) grain size from 7.8 to 6.6 lm. Heavy deformation using multiple passes between A e3 and A r3 with true strain of 0.8 to 1.2 effectively refined the a grain size (4.1 to 3.2 lm) close to the ultrafine size by dynamic-strain-induced austenite (c) fi ferrite (a) transformation (DSIT). The intensities of microstructural banding, pearlite fraction in the microstructure (13 pct), and fraction of the harmful ''cube'' texture component (5 pct) were reduced with the increase in finishing deformation. Simultaneously, the fractions of high-angle (>15 deg misorientation) boundaries (75 to 80 pct), beneficial gamma-fiber (ND//h111i) texture components, along with {332}h133i and {554}h225i components were increased. Grain refinement and the formation of small Fe 3 C particles (50-to 600-nm size) increased the hardness of the deformed samples (184 to 192 HV). For the same deformation temperature [1103 K (830°C)], the difference in a-grain sizes obtained after single-pass (2.7 lm) and multipass compression (3.2 lm) can be explained in view of the static-and dynamic-strain-induced c fi a transformation, strain partitioning between c and a, dynamic recovery and dynamic recrystallization of the deformed a, and a-grain growth during interpass intervals.

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“…Heavy warm deformation (~ 600 °C) followed by rapid intercritical annealing generates bimodal ferrite-carbide structure whereas the air cooled sample after 80 % cold rolling and annealing (600 °C for 8 h) is responsible for the coarse one. The mechanisms behind the formation of the microstructures are given elsewhere [15,16,[20][21][22]. The microstructures of the heat treated samples are prepared following standard metallographic techniques.…”

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confidence: 99%

Effect of elasto-plastic compatibility of grains on void-initiation criteria in low-carbon steel

Karmakar

Barat

2019

Philosophical Magazine Letters

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The present study evidences the role of ferrite grain size distributions on the occurrence of void initiation in a low carbon steel. Various thermomechanical treatments were done to create ultrafine, bimodal and coarse range of ferrite grain distributions. A two parameter characterization of probable void initiation sites is proposed; elastic modulus difference and difference in Schmid factor of the grains surrounding the void. All microstructures were categorized based on the ability to ease or resist void nucleation. For coarse grains, elastic modulus difference as well as the Schmid factor difference is highest, intermediate for ultrafine and lowest for bimodal microstructure.

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Ferrite Grain Size Distributions in Ultra-Fine-Grained High-Strength Low-Alloy Steel After Controlled Thermomechanical Deformation

Cited by 19 publications

References 39 publications

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

Refinement of Ferrite Grain Size near the Ultrafine Range by Multipass, Thermomechanical Compression

Effect of elasto-plastic compatibility of grains on void-initiation criteria in low-carbon steel

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