調質圧延軟鋼板の圧下率と残留応力とに関する一考察

概要

論文の詳細を見る
For mild steel sheets for the press work, it is necessary to have good deep-drawing quality, well-finished surface and to be free from stretcher straining which is apt to appear on the surface of steel pressings after a slight drawing. In general, it is well-known that the magnitude of the stretcher strain depends on the yield-point elongation of steel sheet, thus, a larger elongation leading to severer stretcher straining. This yield-point can be shifted by slightly working the steel before pressing, i, e., by temper rolling. Recently, it has been proved by many investigators that residual stress in temper-rolled sheet influences on the rate of strain aging, the yield-point elongation of mild steel, and the stretcher straining. The present investigation was carried out to ascertain the effect of percentage reduction on the residual stress distribution, yield strength, yield ratio, Erichsen value and hardness. 0・07% C-mild steel sheet was used in these experiments. Temper rolling was carried out on a 100 mm. dia. experimental mill at a rolling speed of 30 cm/min. without tension, the reductions given to sheets varying from 0% to 4・5%. Determination of the residual stress was done by the usual method of etching away from one side of the sheet, and the original residual-stress distribution was calulated by measuring the change in the curvature of the specimen as the thickness is reduced. The outline of these results was as follows. (a) At about 0・2% reduction, the temper-rolled mild steel sheet have the minimum of yield strength, the maximum of Erichsen value and therefore the maximum formability. (b) In the reduction range from 0% to 0・3%, skin residual stress is compression and above this range is tension. For explaining the cause of this phenomenon, it may be taken that in the smaller range than 0・3% reduction, mild steel sheet is rolled on the extreme surface layer only, but in larger range, the core is deformed more severely than the rolled surface layer.
社団法人日本材料学会の論文
1957-05-15

調質圧延軟鋼板の圧下率と残留応力とに関する一考察

スポンサーリンク

概要

著者

関連論文

スポンサーリンク