The central section of the 45 ° fan-shaped test block (as shown in Fig. 4-15) is selected for the sampling of the test block. By sawing 150 mm off the left and right sides of the 45 ° fan-shaped test block, it can be seen that the 45 ° fan-shaped test block has no color difference and macro defects on the whole section, indicating good spheroidization. Then, the 45 ° fan-shaped test block is sawed from the center into two equal halves, and finally along the bottom half Take a 30mm sector as shown in Figure 1.

Take a 30mm wide strip from the side of the obtained 30mm thick fan-shaped test block, and cut 16 samples from the inside to the outside on the strip as a group, as shown in Figure 2. Then, the same cutting method was used to cut 16 sets of specimens on a 30mm thick segment, each set containing one tensile test bar and three impact samples.

The shape and size of tensile specimen and impact specimen are made according to GB / t1348-2009, as shown in Figure 3. Tensile test shall be carried out in accordance with GB / t228 and impact test shall be carried out in accordance with GB / t229.

The performance of the 45 ° fan-shaped test block meets the performance requirements of the ductile iron spent fuel container. Among them: the tensile strength exceeds the required value by 17%, the yield strength exceeds the required value by 49%, the elongation is more than 2 times of the required value, and the room temperature impact value and – 40 ° C impact value exceed the required performance value by more than 50%. Even at the final solidification position of the 45 ° sector block, the yield strength RPA2 = 240mpa, the tensile strength RM = 380MPa, the elongation a = 19.5%, the impact value at room temperature AK ≥ 23.1 / j.cm2, and the impact value at – 40 ° C AI ≥ 5.94 / j.cm2.