Effect of roll speed ratio on microstructure evolution and mechanical properties of 0.18 wt% carbon steel deformed by differential speed rolling

Hamad, Kotiba; Ko, Young Gun

doi:10.1016/j.matlet.2015.07.127

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…Due to the small amount of strain (~0.4) introduced into the sample, the structure seemed to be highly deformed but with no indication of forming ultrafine grains. By increasing the introduced strain, the structure became more severely deformed after the fourth pass, which is equal to a strain of ~1.7; ultrafine grains were observable using the EBSD, as seen from Figure 4b-d, and these results were like those from previous investigations [20,21]. The microstructure showed relatively elongated grains with regular orientations along the rolling direction after the four-pass DSR deformation.…”

Section: Microstructural Evolutionsupporting

confidence: 82%

Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

Hamad

2021

Metals

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The aim of this paper was to investigate the microstructural development and properties of interstitial free (IF) steel fabricated using the DSR (differential speed rolling) process. Severe plastic deformation of the DSR passes was imposed on the sample for up to four passes, leading to ~1.7 total strain with a speed ratio of 1:4 between the two rolls. Microstructural observation revealed that the equiaxed grain size of ~0.7 µm, including the formation of grain boundaries with a high angle of misorientation, was reached after four operations of DSR, which was attributed to the grain subdivision of severely elongated ferrite grain. Since the deformation mode of the DSR operation was dominated by severe shear deformation, the main shear texture of the bcc components appeared in all DSR operations in which the α-fiber of the {110} slip became a main component in accommodating the severe plastic deformation of the DSR process. The intensity of the shear texture, the {110} and {112} slip, increased by increasing the number of passes. Moreover, the γ-fiber of the <112>-type planes was activated as a result of the alternation of the shear direction during sample rotation. The microhardness and room temperature tensile tests revealed that the strength of the IF steel improved as the amount of strain increased, and this was attributed to the grain refinement and texture characteristics of the samples after the DSR processing.

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Section: Microstructural Evolutionsupporting

confidence: 82%

Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

Hamad

2021

Metals

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“…These samples were severely deformed by DSR method utilizing two working rolls whose diameter was 220 mm. The roll-speed-ratio of 1:4 for the lower and upper rolls was selected because the grain size in the sample deformed at roll-speed-ratio of 1:4 was finer relatively than the grain sizes at roll-speed-ratio lower than 1:4 [3,7,11]. The speed of the lower roll was fixed to be ~50 mm/s.…”

Section: Methodsmentioning

confidence: 99%

Interpretation of annealing texture changes of severely deformed Al-Mg-Si alloy

Hamad

Yang

2016

Journal of Alloys and Compounds

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“…For example, the cross rolling introduced by Oertel et al [16] was conducted on molybdenum plates to enhance the metal’s formability due to the developed homogeneity of texture and microstructure refinement. Asymmetrical rolling was adopted by Hamad et al [17] to obtain equiaxed ultrafine ferrite grains in 0.18 wt % carbon steel. The cross-roll rolling was applied by Kim et al [18] to manufacture AZ31 Mg sheets with uniform texture intensity from the surface layer to the middle layer.…”

Section: Introductionmentioning

confidence: 99%

Comparing the Through-Thickness Gradient of the Deformed and Recrystallized Microstructure in Tantalum with Unidirectional and Clock Rolling

et al. 2019

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Controlling the microstructure homogeneity is crucial in achieving high quality tantalum (Ta) sputtering targets used in integrated circuit fabrication. Unluckily, traditional rolling easily generates a microstructure gradient along the thickness direction in Ta sheets. The deformation and recrystallization behavior of unidirectional and clock rolled Ta with an 87% strain were therefore systematically compared to investigate whether the change of strain-pass can effectively ameliorate the microstructure gradient along the thickness. Electron backscatter diffraction was used to analyze the misorientation characteristics of the deformed grains. A strong microstructure gradient exists in the unidirectional rolled (UR) sheets. Many microshear bands and well-defined microbands occurred in {111} deformed grains in the UR sheets, especially in the center region, while the grain fragmentation with {111} and {100} orientation in the clock rolled (CR) sheets was more homogenous along the thickness. The kernel average misorientation (KAM) and grain reference orientation deviation-hyper (GROD-Hyper) further confirmed these differences. X-ray line profile analysis (XLPA) indicated that the stored energy distribution was more inhomogeneous in the UR sheets. Schmid factor analysis suggested that the strain path changes due to clock rolling promoted the activation of multiple slip systems in {111} oriented grains. Upon static annealing, homogeneous nucleation combined with a slower grain growth rate resulted in finer and more uniform grain size for the CR sheet. In contrast, a strong recrystallization microstructure-gradient along the thickness formed in the UR sheets, which is attributed to the fact that the higher stored energy and more preferential nucleation sites led to faster recrystallization in the center region, as compared with the surface region. Thus, clock rolling can effectively improve the homogeneity of the through-thickness recrystallization microstructure of Ta sheets.

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Effect of roll speed ratio on microstructure evolution and mechanical properties of 0.18 wt% carbon steel deformed by differential speed rolling

Cited by 17 publications

References 20 publications

Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

Development of Ultrafine Grain IF Steel via Differential Speed Rolling Technique

Interpretation of annealing texture changes of severely deformed Al-Mg-Si alloy

Comparing the Through-Thickness Gradient of the Deformed and Recrystallized Microstructure in Tantalum with Unidirectional and Clock Rolling

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