アルミニウム焼鈍板の再結晶聚合組織と異方性におよぼす鋳塊予備加熱の影響について

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  • On the Effect of Preheating Conditions on the Recrystallization Texture and Anisotropic Properties of Annealed Aluminium Sheets
  • アルミニウム ショウドンバン ノ サイケッショウシュウゴウソシキ ト イホウセイ ニ オヨボス チュウカイ ヨビ カネツ ノ エイキョウ ニ ツイテ

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The problem of the anisotropic properties of aluminium sheets is regarded as of great importance to makers because of the “earing” phenomena which occur during deep drawing. Experiments were carried out to study the effect of preheating ingots on the anisotropy and recrystallization texture of the annealed aluminium sheets. By the present investigation the following results were obtained: (1) In the aluminium sheet which was hot- and cold-rolled from the ingot without any intermediate annealing treatment, the recrystallization texture and the anisotropy of the annealed sheet depend on the preheating temperature and time before rolling. (2) The above effect of preheating was not observed in high purity aluminium, but in commercial aluminium. This implies that the effects are concerned with the impurity elements in the aluminium ingots. (3) When a commercial purity aluminium ingot was preheated and rolled the recrystallization texture of the annealed sheet retained most of the main component of the rolling texture (123)[1\bar21], and this results in a 45° earing by deep drawing. When the ingot was not preheated, the second orientation (100)[001] appeared and a 90° earing was observed. (4) It was revealed by microscopic observation and electric resistance measurement that the precipitation of impurities is introduced by the preheating treatment of the ingot. It may be possible to conclude that the changes in the anisotropy and the recrystallizating texture are induced by the precipitation of the impurities when the ingot is preheated.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (12), 765-769, 1960

    公益社団法人 日本金属学会

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