The matrix of qt400-18 is mainly ferrite. The chemical composition of qt400-18 is not specified in GB 1348-2013 ductile iron standard, so the chemical composition of qt400-18 material used in this project needs to be specified according to the needs of microstructure and properties. The chemical composition range of...
1) The self-developed 16 channel temperature measuring device was used to successfully collect the temperature curves of 45 ° fan-shaped test block and mold. By comparing the simulated solidification time with the measured solidification time and the simulated solidification sequence with the actual solidification sequence, it is proved that...
According to the simulation results and the experimental study of 45 ° test block, the ductile iron spent fuel container adopts the metal mold casting process, the outer side of the ductile iron spent fuel container adopts the metal mold, and the inner side adopts the direct external chill...
The relationship between the number of graphite balls and the properties of 45 ° sector block is shown in Figure 1. Compare the performance of 45 ° fan-shaped block at different positions: the tensile strength is 371 MPa? The results show that the minimum value and maximum value are...
Metallographic examination shall be carried out in accordance with GB / t9411. The graphite morphology and matrix structure at different positions of 45 ° sector block are shown in Figure 1. When the sampling position moves from the edge to the final solidification position, the size of graphite balls...
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 °...
The temperature measurement curves of different positions of 45 ° sector test block are shown in Fig. 1. The cooling conditions and cooling rates at different positions of 45 ° sector test block are different, resulting in different solidification time. Based on the differential analysis of the cooling curve...
The temperature curves of chill and metal mold are shown in Fig. 1 and Fig. 2 respectively. In about 18 minutes, the inner temperature of the cold iron rises rapidly to 700 ° C, and the outer temperature rises to 100 ° C. at this moment, the temperature gradient...
Using high-purity pig iron as the main raw material, the high-temperature pure and high-quality molten iron meeting the composition requirements can be obtained by electric furnace melting, so as to control the chemical composition and trace elements. Trace elements interfere with the spheroidization of large low temperature high toughness...
The microhardness of lzqt600-3 ductile iron profile was tested under the optimal scheme of nitrocarburizing state in three parts. The effective hardened layer depth of the sample was obtained by hardness distribution gradient and effective hardening depth limit. The figure shows the micro Vickers hardness metallography and hardness gradient...