Cu 添加極低炭素冷延鋼板の r^^- 値に及ぼす熱延板中の Cu の存在状態の影響

概要

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The effect of morphorogy of Cu phase before cold rolling on r-value of Cu-added extra low carbon Ti-added steel sheets was studied. The morphorogy of Cu phase can be affected by the hot-band heat treatment temperature and the cooling rate after the heat treatment. When hot-bands are heat treated at 550℃ or at 800℃ and slowly cooled, fine Cu-rich cluster which strengthens the steel is formed. When heat treated at 700℃, ε-Cu is formed but Cu-rich cluster is not formed at the cooling rate range examined. When hot-bands are heat treated at 450℃ or 800℃ and rapidly cooled, Cu is in solid solution. The r-value of annealed steel sheets is affected by the structure of Cu precipitates before the cold rolling. When Cu-rich cluster is formed, the r-value is low according to the decreasing of the intensity of {554} <225> in recrystallization texture. When Cu is in solid solution or ε-Cu is formed before cold rolling, the pole figures of annealed sheets are {554} <225> type and r-value is kept high.
社団法人日本鉄鋼協会の論文
1995-07-01