Abstract
There are earlier reports about the relations between the gas content of molten steel and the internal structure of the solidified ingot, but their mechanism was left unsolved. As an attempt to solve this problem, a series of comparative studies was made. The same heats were poured into two same ingot molds, one was solidified under high atmospheric pressure and another under ordinary pressure applied was chosen as 5, 10, 20 and 40kg/cm2 based on the calculation of the gas formation during solidification. Comparison of the internal structures of the two ingots from respective heats gave the following results.(1) The gas formation during solidification has influence on the inverse V segregation.(2) The inverse V segregations almost disappear at pressure of 5kg/cm2 in a chill mold and 40kg/cm2 in a sand mold.(3) The grain size of primary crystals is refined by high pressure.(4) The length of columnar crystals is unchanged.
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