Estimation of the Degree of Recrystallization upon Annealing of Cold-Rolled Automobile Body Sheet Steels Using EBSD Analysis and Hardness Measurements

Vasilyev, A.; Rudskoy, A. I.; Glukhov, P. A.; Sokolov, S. F.; Колбасников, Н. Г.

doi:10.1134/s0036029518100191

Cited by 4 publications

(1 citation statement)

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“…The area fraction of the recrystallized grains was measured based on the grain average misorientation technique, [ 32,33 ] in which the grains with an average misorientation angle inside less than 2° were considered recrystallized structures; the grains with a misorientation angle between 2° and 10° were classified as substructures; and deformed structures were classified as structures with misorientation angles >10°. As shown in Figure 5, the sample subjected to LTH showed a higher fraction of deformed grains (67% with LTH vs 52% with HTH) and a lower recrystallization fraction (23% with LTH vs 34% with HTH) compared with that subjected to HTH, indicating a higher recrystallization resistance during hot rolling.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

2023

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Herein, the precipitation behavior of Mn‐bearing dispersoids in Al‐3Mg‐0.8Mn (AA5454) alloy subjected to different heat treatments is investigated. The effects of Mn‐bearing dispersoids on the tensile properties and recrystallization resistance of the abovementioned alloy during hot/cold rolling and postrolling annealing are evaluated. The results show that a low‐temperature three‐step heat treatment (275 °C/12 h + 375 °C/48 h + 425 °C/12 h) generates a higher number density of Mn‐bearing dispersoids with finer sizes compared with the typical high‐temperature heat treatment (430 °C/2 h + 480 °C/2 h + 525 °C/2 h), thus resulting in significantly improved tensile strengths of hot/cold‐rolled sheets. After annealing at 300 °C, the yield strength (YS) of the alloy reached 196 MPa after hot rolling and 237 MPa after cold rolling, showing an improvement of 30%–32% over samples subjected to high‐temperature heat treatment. In addition, the low‐temperature heat treatment provides a higher recrystallization resistance after hot and cold rolling owing to the higher number density of Mn‐bearing dispersoids and the lower fraction of dispersoid‐free zones. The YS contributions of various strengthening components after hot and cold rolling are discussed based on constitutive models. The predicted yield strengths agree well with the experimental values.

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Section: Resultsmentioning

confidence: 99%