冷間圧延したオーステナイト系ステンレス鋼板の平たん化に及ぼす低温熱処理時の負荷応力の影響

概要

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In some cases, cold rolled austenitic stainless steels are heat-treated at a low temperature to improve the threshold value of spring and the fatigue life. Also, the flatness of stainless steel strips is improved by tensile loading given during such low temperature annealing. In order to find suitable condition for better flatness, the relationship between the strain and the stress evolved during low temperature annealing for 1 hour is investigated by heat-treating cold rolled stainless steels. The following conclusions are obtained ; (1) The strain increases linearly with tensile stress up to 600N/mm^2, and the slope to stress is as small as the reciprocal of Young's modulus. (2) A tensile stress near 200N/mm^2, which is far below the yield strength, is required to improve the flatness of the strips, because of the small slope to stress. (3) The mechanism of micro deformation at low temperatures is considered to relate with stress relaxation, because most of plastic strain is evolved during heating to the annealing temperature.
社団法人日本鉄鋼協会の論文
1995-09-01