In order to study the action mechanism of silicon element on high silicon ductile iron, the microhardness of ferrite matrix of ductile iron samples with different silicon content was measured, the element distribution was observed by scanning electron microscope, and the change of ferrite lattice constant was analyzed by...
(1) Ductile iron samples with silicon content of 2.9%~4.6% were prepared by EPC process, and the matrix structure was ferrite. When the silicon content was 2.92%, the average diameter of spherical graphite of QT450-10 ductile iron samples was about 35.6 μ m. The average number of graphite balls per...
Tensile strength and Brinell hardness are two important indicators to evaluate the properties of nodular cast iron. The test results of mechanical properties of as cast ductile iron samples with different silicon content are shown in the table. It can be seen that the tensile strength, yield strength, elongation...
The graphite morphology of ductile iron samples with different silicon content is shown in Figure 1. With reference to the international standard GB/T 9441-2021 Metallographic Inspection of Ductile Iron, the nodularity of graphite is more than 90%, and the roundness of graphite is basically unchanged. Sample No ω (Si)...
In order to study the effect of different silicon content on the structure and properties of ductile iron and the mechanism of silicon on high silicon ductile iron, one group of QT450-10 ductile iron samples was designed as the control group, and three groups of high silicon ductile iron...
With the development of industrialization in China, ductile iron has become the main metal material in industrial production due to its good comprehensive performance, mainly based on ferrite matrix, and the typical brand is QT450-10. Because of its excellent mechanical properties, it has been widely used in metallurgical machinery...
(1) A new generation of high-performance piston is manufactured by using ferrite ductile iron, such as QT600-7 profile split method. That is, use ductile iron pipes to process the piston head, use ductile iron bars to process the piston skirt, and then use inertial friction welding to obtain the...
During the production of the ductile iron profile, the medium frequency induction furnace can be used for smelting. The number of graphite balls can be increased through multiple inoculation and spheroidizing treatment. Generally, the inoculant used is 75SiFe or silicon strontium, and the spheroidizing agent is FeSiMg6RE2. The centrifugal...
The QT600-7 ductile iron piston after friction welding needs to be annealed at 400 ℃ – 500 ℃ to eliminate the welding stress, and then can be directly processed to make the finished piston. However, its tensile strength is ≥ 600MPa, and its yield strength is ≥ 400MPa, that...
Since the new high-performance piston uses ball ground cast iron profiles to process the piston head and piston skirt respectively, and then needs solid state welding. Considering the solid welding performance of nodular cast iron, QT600-7 nodular cast iron is preferred as the profile used to prepare the new...