鋼塊 V 偏析の生成機構について

概要

論文の詳細を見る
According to many studies on the formation of the V segregation, the formation seems to be affected by the following three factors ; the thermal state, the gravitational action, and the dendrite morphology. In order to show how the V segregation would be influenced when each factor was varied independently or mutually, some investigations were made on sand-cast ingots. The results obtained are summarized as follows : 1) The V segregation appeared in the acceralated solidification area of small tapered ingots with a large ratio of height to diameter ; the area did not suffer the both end and riser effects. 2) The gravity itself did not have any direct effect on the V segregation, but the shape of the segregation was rather influenced by the change of dendrite morphology and the distribution of chemical compositions which were caused by the gravity action. 3) The V segregation tended to disappear with an increase of the amount of taper. With the great taper, the concentrated melts to become the V segregation was found to be squeezed from the area corresponding to the V segregation zone toward the feeder head with the progress of solidification. A discussion was made on the formation mechanism of the V segregation based upon the results described above, and the theory of the suction by the volume shrinkage of molten steel on solidification could well explain the experimental results.
1973-03-01