Abstract
Succeeding to the previous report, the segregation in copper alloy castings was studied this time.
The determination of segregation was made by the similar method to the previous experiment, i. e. the local spectrographic analysis. The determinations were made on the samples of 10% Sn-Cu alloy cast into green sand mold and on the samples made of the same alloy treated with zirconium and cast into water-cooled metal and green sand molds respectively.
The gists of the experiments are as follows :
1) Inverse segregation appeared at the outer layer of the sample which was cooled rapidly, disappeared in the sample cooled slowly and which was made of the alloy without zirconium treatment.
2) The grain size of the sample made of the alloy treated with zirconium and slow cooled, becomes very fine and the shape of segregation curve of this sample shows somewhat different type with that of untreated.
3) Neither the grain structure nor the segregation curve of the sample treated with zirconium and slow cooled, show any remarkable difference with these of the sample non-treated. In this report, detailed and theoretical considerations were given to the results mentioned above.
