Abstract
Some metallurgical processes used to obtain suitable materials for deep drawing (textures with a predominance of {011} components parallel to the sheet surface) lead in the case of thin sheets, to the formation of non-advantageous texture and to excessive material hardness as well as to undesirable grain growth. In order to find suitable production methods for radiator material the quality of sheets obtained by middle temperature annealing and a wide range of final reductions was investigated. Mechanical properties, anisotropy, and hardening coefficients, as well as the sheet structure have been analysed: the grain size and texture were determined qualitatively from pole figures. Two technological processes for obtaining half-hard sheet were used – annealing and rolling. It was found that optimum mechanical properties and plastic anisotropy are connected with the {934}〈223〉 5° texture and with homogeneity of suitable grain size. Rolling with a reduction greater than 85% assures a stable and fully recrystallized texture of this type. It was found too, that more advantageous sheet properties are obtained by annealing to the half-hard state. It was established that the annealing temperature range over 420°C leads to heterogeneity of grain size.
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