Thermomechanical treatment for enhancing gamma fiber component in recrystallization texture of copper-bearing bake hardening steel |
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Authors: | Kyu Hwan OhSe Min Park Yang Mo Koo Dong Nyung Lee |
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Affiliation: | a Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Hyoja-Dong Nam-gu, Pohang 790-784, Kyoungbuk, Republic of Korea b Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea |
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Abstract: | A two-step rolling-annealing process has been developed to increase the 〈1 1 1〉//ND (γ fiber) component in the recrystallization texture of a copper-bearing bake hardening steel. The two step process comprises the first rolling by a low reduction in thickness and subsequent annealing at 780 °C, followed by the second rolling by a high reduction and subsequent annealing at 780 °C. The first rolling process aims at seeding the γ fiber oriented grains, so that they can grow at the expense of differently oriented grains developed in the second rolling process. In this way the density of γ fiber component in the recrystallization texture of the bake hardening steel much increases compared with that in the conventional one-step rolling-annealing process. |
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Keywords: | Copper-bearing bake hardening steel Two-step rolling annealing process Enhancement of gamma fiber Texture Recrystallization Grain growth |
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