Abstract
The standard V-notch Charpy, Tipper and Van der Veen tests were performed, using the plates of various thickness of semikilled and killed steels in order to study the correlations among the various transition temperatures and the advantages and disadvantages of the tests. The results obtained are as follows :
1. As the criterion to derive a fracture transition temperature, the shear percentage of the fractured surface of a specimen is most reliable.
2. It is difficult to derive the ductility transition temperature from either Van der Veen or Tipper tests if they are carried out at temperatures higher than -60°C, so far as the materials have not much higher transition temperature.
3. The steepnesses of the transition curves are almost equal in both Tipper and Van der Veen tests and smaller in Charpy test than in the others.
4. The difference of the fracture transition temperatures of steels is most prominent by Van der Veen test and in the order of Tipper and Charpy tests.
5. Charpy specimen is not as plate thickness as Tipper and Van der Veen specimens, but Charpy results can be correlated with Tipper and Van der Veen results.
6. Generally speaking, the transition temperatures drop with decreasing equivalent carbon and with increasing Mn/C among the same grade of steels.
