Observation about the Notch Toughness of High Tensile Steel (Continued)

Abstract

In the previous report, authors investigated the influence of finish roll temperature of three project high tensile steel plates, 22 mm thick. During the course of that work it became evident that further information was desirable concerning the mechanical properties and notch sensitivity in thickness direction (Z direction).
This report was intended to furnish information about the influence of each of the finish roll temperatures on the mechanical properties and notch toughness of Z direction in a series of the same project steels as the above-mentioned.
Suitable testing methods to measure these properties are as follows:
(1) V-Charpy impact test in Z direction (the specimens were taken from cross joint of double bevel grooves with fillet welds).
(2) Tension test in Z direction using the test piece of cross joint.
(3) Micro tension test in X, Y and Z directions.
As a result, it was concluded that marked difierences of mechanical properties and notch toughness was observed in the specimen of Z directions as compared to those of X and Y directions, but these anisotropic properties were the common among the three project steel plates, and steel "C" showed rather better performance even in Z direction.