縁付鋼塊に於ける氣泡の壓著性

概要

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One of distinctive features of the rimmed steel ingot is the location of internal gas holes, so called lenticular blow holes in the outer case and central ones in the inner zone. Still, very little has known of their conditions and properties under the mechanical hot working. Auther confirmed that they are possible to be welded by either forging or hot rolling. Tests were made in two ways. In the first experiment a number of pieces cut off from the ingot were forged to the various thickness at a certain direction. In the second experiment two series of ingots respectively cast with the same heat were rolled to the various sections of blooms. Then careful observation was employed to relate the course of welding by macro- and microscopic investigation and mechanical testing. The results on hot rolling show that welding of blow holes were demanded over 90% or 96%, for each mild or semi- mild steel ingot, of reduction of area to the original dimensions. Moreover, some examples were illustrated that thin-seated blow holes were appeared in rolled bars or plates as serious defects including seams or pitted faces.
社団法人日本鉄鋼協会の論文
1935-03-25