冷延鋼板のプレス成形特性値におよぼす酸素量の効果

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The effect of oxygen content on the mechanical properties and grain size has been examined in both the pure iron base and a low carbon rimmed steel base. The following results were obtained. (1) In the pure iron base, the plastic strain ratio depends largely on the oxygen content. The plastic strain ratio decreases remarkably above about 0.02 percent of oxygen. The mechanism is explained with relation to the nucleation of recrystalized grain and the grain growth. In both 68% and 80% cold rolled sheets, the recrystallized grains with the orientation of {110} [001] grow in the sample of above about 0.02 percent of oxygen, and in 90% cold rolled sheets the grains with the orientation of {411} [148] which decrease the plastic strain ratio of sheets nucleate and grow in the matrix with {100} [011] orientation of as-cold rolled sheets in the sample of above about 0.02 percent of oxygen. (2) The effects of oxygen contents on the strength and the elongation depend mainly on the grain size. This is easily understood by considering the very small solubility of oxygen into ferrite at room temperature. (3) With the increase of oxygen contents, the strength and the elongation do not change largely in the pure iron base, whereas the strength increases and the elongation decreases in the low carbon rimmed steel base. This is explained well by the increase of the grain size number with the increase of oxygen contents in the low carbon rimmed steel base. (4) The reason why the samples of high oxygen contents have fine grain size in the low carbon rimmed steel base is that fine precipitates interrupt the growth of fine grains which nucleated around the oxides. This precipitate is identified as β-MnS by transmission electron microscopy.
1973-08-01

冷延鋼板のプレス成形特性値におよぼす酸素量の効果

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