Heterogeneous deformation in single-phase Zircaloy 2

Sahoo, Santosh Kumar; Hiwarkar, Vijay; Samajdar, I.; Dey, G.K.; Srivastav, D.; Tiwari, Ratnesh; Banerjee, Suparna

doi:10.1016/j.scriptamat.2007.02.008

Cited by 53 publications

(43 citation statements)

References 15 publications

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“…IQ represents the quality of EBSD patterns and can be used to ''approximate'' the relative presence of strain in a deformed microstructure. [23] The IPF maps, however, show the crystallographic directions of the orientations in suitable color codes. To ensure statistical significance, the grain boundary character distribution (GBCD), misorientation parameter (i.e., GOS and GAM), and average grain size in each sample is analyzed from at least two maps obtained from different 500 9 500 lm 2 areas.…”

Section: Methodsmentioning

confidence: 99%

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Mandal

Bhaduri

Sarma

2010

Metall Mater Trans A

223

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Dynamic recrystallization (DRX) behavior in hot deformed (by uniaxial compression in a thermomechanical simulator in the temperatures range 1173 K to 1373 K [900°C to 1100°C]) Ti-modified austenitic stainless steel was studied using electron back scatter diffraction. Grain orientation spread with a ''cut off'' of 1 deg was a suitable criterion to partition dynamically recrystallized grains from the deformed matrix. The extent of DRX increased with strain and temperature, and a completely DRX microstructure with a fine grain size~4 lm (considering twins as grain boundaries) was obtained in the sample deformed to a strain of 0.8 at 1373 K (1100°C). The nucleation of new DRX grains occurred by the bulging of the parent grain boundary. The DRX grains were twinned, and a linear relationship was observed between the area fraction of DRX grains and the number fraction of R3 boundaries. The deviation from the ideal misorientation of R3 boundaries decreased with an increase in the fraction of R3 boundaries (as well as the area fraction of DRX) signifying that most R3 boundaries are newly nucleated during DRX. The generation of these R3 boundaries could account for the formation of annealing twins during DRX. The role of R3 twin boundaries on DRX is discussed.

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Section: Methodsmentioning

confidence: 99%

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Mandal

Bhaduri

Sarma

2010

Metall Mater Trans A

223

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“…The later can be taken as an indicator of 'measurement uncertainty'. 41) Figure 1 shows a clear shift . The GAM distribution of a typical recrystallized sample is also given for reference.…”

mentioning

confidence: 92%

“…For the later, misorientation in excess of 1°(i.e. beyond measurement uncertainty 41) ) was considered. * 4 Estimated average misorientation involving cropped grains has similarities with automated GAM estimates (Figs.…”

mentioning

confidence: 99%

Controlled Warm Working: Possible Tool for Optimizing Stored Energy Advantage in Deformed γ-fiber (ND//&lsaquo;111&rsaquo;)

et al. 2009

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In the present study, ultra low carbon steel samples were deformed in near plane-strain mode with different strains, strain rates and temperatures. Estimates of in-grain misorientation developments were obtained respectively for the g-fiber (ND//͗111͘) and a-fiber (RD//͗110͘) oriented deformed grains. Though a general drop in in-grain misorientation was observed with increase in deformation temperature, the highest reduction of 70 % showed a clear increase at the intermediate deformation temperatures. Under these condition(s), the misorientation increase in deformed g-fiber grains was more substantial than in a-fiber grains. The phenomenon was related to the preferred appearance of grain interior strain localizations. The study brings out a clear possibility of optimizing the stored energy advantage in the deformed g-fiber through controlled warm working.

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“…[8][9][10][11][12][13] In the work of Gerspach et al, [11] it was shown that the fragmentation of grains has an influence upon the primary recrystallization texture following moderate strain deformation (~40 pct). [11] In these cases, oriented nucleation of new grains occurs at fragmented regions of the prior grains.…”

Section: Introductionmentioning

confidence: 99%

“…The texture's development in the latter stages of recrystallization and the overall recrystallization process is dominated by the favorable growth of specific grain orientations. [3,[8][9][10]14,15] The frequency of these specific grains following primary recrystallization will influence the texture that develops in secondary recrystallization. [8] Thus, the deformed state of the grains will influence the final recrystallization texture via its influence upon the processes taking place during primary recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

Honniball

Preuss

Rugg

et al. 2015

Metall Mater Trans A

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A combination of mechanical testing, EBSD and crystal plasticity finite element modeling were used to investigate the influence of temperature on the fragmentation of grains in a zirconium alloy. The results demonstrate that grains of Zircaloy-4 fragment more as the temperature rises. This trend can be explained by an increasing difference between the CRSS values for hc+ai slip and hai slip as temperature rises. This change in relative slip activities with temperature is supported by experimental observations of macroscopic anisotropy and in-grain misorientation axes calculated from EBSD data, as well as plasticity modeling. By tracking the microstructural evolution during deformation, it is shown that the two major texture components fragment to different degrees under the action of prismatic slip. Grains in the 1120 fiber are significantly more stable than those in the 1010 fiber, which break up. Grains of the latter fiber fragment heterogeneously as portions of the grain rotate in opposite directions, and some do not rotate at all.

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Heterogeneous deformation in single-phase Zircaloy 2

Cited by 53 publications

References 15 publications

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Controlled Warm Working: Possible Tool for Optimizing Stored Energy Advantage in Deformed γ-fiber (ND//&lsaquo;111&rsaquo;)

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

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Heterogeneous deformation in single-phase Zircaloy 2

Cited by 53 publications

References 15 publications

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Controlled Warm Working: Possible Tool for Optimizing Stored Energy Advantage in Deformed &gamma;-fiber (ND//&lsaquo;111&rsaquo;)

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

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Controlled Warm Working: Possible Tool for Optimizing Stored Energy Advantage in Deformed γ-fiber (ND//&lsaquo;111&rsaquo;)