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TECHNICAL PAPERS

Effect of Strain Path and the Magnitude of Prestrain on the Formability of a Low Carbon Steel: On the Textural and Microtextural Developments

[+] Author and Article Information
S. K. Yerra, I. Samajdar

Dept. of Met. Eng. and Mater. Sci., IIT Bombay, Powai, Mumbai 400 076, India

H. V. Vankudre, P. P. Date

Dept. of Mech. Eng., IIT Bombay, Powai, Mumbai 400 076, India

J. Eng. Mater. Technol 126(1), 53-61 (Jan 22, 2004) (9 pages) doi:10.1115/1.1631435 History: Received August 12, 2002; Revised May 27, 2003; Online January 22, 2004
Copyright © 2004 by ASME
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References

Figures

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Effects of textural changes at different strain paths: (a) Volume fraction of ideal fibers and texture components, as estimated at 16.5 deg Gaussian spread, and (b) texture estimated 35 normal anisotropy (R) values at different angles (0–90 deg ) with respect to the rolling direction (RD)
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ϕ1=0 deg and ϕ2=45 deg ODF sections of simulated ODFs using Lamel 18 model: (a) Strain Path 1c; (b) Strain Path 2c; (c) Strain Path 3c; (d) Strain Path 4c; and (e) Strain Path 5c. Contour levels are 0.7, 1.0, 1.4, 2.0, 2.8, 4.0, 5.6, 8.0, 11.0, and 16.0 times the random.
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Selection of samples. Strain and strain paths (on the experimental FLD) showing the positions from where the samples (along with respective sample codes) were selected for the present study
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Idealized ϕ2=45° section of the ODF, showing the ideal fibers (α 〈110〉//RD and γ 〈111〉//ND) and texture components (F {111}〈112〉, E {111}〈011〉, I {211}〈011〉, and H {100}〈011〉). This is shown for readers’ convenience and also for easier comparison of Figs. 3 and 6.
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Textural changes with strain path. ϕ1=0 deg and ϕ2=45 deg ODF sections, as obtained from bulk texture measurements: (a) as-received; (b) Strain Path 1c; (c) Strain Path 2c; (d) Strain Path 3c; (e) Strain Path 4c; and (f ) Strain Path 5c. Contour levels were drawn at 0.7, 2.5, 4.0, 5.0, and 6.4 times the random
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Changes in fiber intensities with strain path. Fiber intensity plots for (a) γ (〈111〉//ND) and (b) α (〈110〉//RD) fibers. Relative Intensity or f(g) (in times random) is plotted against appropriate Euler angle of ϕ1 and ϕ
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Comparison of R values: (a) At strain path 1c, bulk texture estimated R values were compared with R-values predicted by different deformation texture simulations. As shown in the figure, Lamel offered best predictability of R at this strain path. (b) R-average values at different strain paths and as obtained by different techniques are compared. R-average of as-received sample is included as reference. Included are: R-average values measured by standard mechanical (R-avg (Mech)) and magnetic (R-avg (Modul R)) measurements 1, bulk texture estimated R-average (R-avg (Tex)) and Lamel model simulated R-average (R-avg (Tex Sim)).
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Taylor Factor (M) plots at ϕ2=45 deg ODF section for (a) Strain Path 2c and (b) Strain Path 5c. M values were estimated using full constraint Taylor model.
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Substructural developments in strain path 1c. (a) TEM micrograph showing deformed E and I grain. (b) and (c) are the respective (111) pole figures representing local orientation measurements in the deformed E and I grain. (d) and (e) are magnified images of the typical first generation DDWs (dense dislocation walls) and MBs (micro bands) at this strain path. RD and TD (rolling and transverse directions) of all the micrographs (figs. (a), (d), and (e)) are marked in (a).
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Substructural developments in strain path 5c. (a) TEM micrograph showing deformed I grain. (b) and (c) are the respective (111) pole figures representing local orientation measurements in deformed E and I grains. (d) TEM micrograph of deformed F grain.

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