The chemical composition of cast high strength and high toughness locking ring steel for dredger was studied. The lock ring is cast after batching and melting. The lock ring casting and auxiliary casting block are shown in Fig. 1. The complete austenitizing temperature of the test steel is determined...
(1) With the increase of casting modulus MS, on the one hand, the amount of graphite precipitation in nodular iron matrix increases, the diameter of graphite ball increases, while the spheroidization rate of graphite decreases, and the number of graphite balls decreases; on the other hand, the amount of...
For austempered ductile iron, the carbon content in high temperature austenite and retained austenite has a significant effect on the subsequent isothermal transformation and mechanical properties of the alloy. However, the solubility of carbon atoms in austenite varies with the as cast microstructure and austenitizing process. This experiment plans...
OM Observation The metallographic sample is made by standard metallographic technology. The concrete methods are: grinding the observation surface on the sandpaper of different sizes one by one → polishing the observation surface to no scratch → flushing and drying the surface with anhydrous alcohol → corrosion surface of...
Tensile test Ht-2402-100kn universal testing machine is used to measure the tensile properties of ADI in strict accordance with GB / T 228-2002. Each group of tensile tests shall not be less than 3 times, and the average value shall be taken as the final test result. The calculation...
Temperature test of molten iron Ya1-w330 portable melting thermometer is used to measure the molten iron temperature in the process of electric furnace melting, and strictly control the temperature of molten iron out of furnace, spheroidizing temperature and pouring temperature. During the test, zero the thermometer first, and then...
In order to test the carbon content in austenite during austenitizing, gsl-1500x 1500 ℃ high temperature vacuum tube furnace was used to austenitize the flake samples taken from ductile iron test bars with casting modulus of 0.25cm, 0.50cm and 1.25cm under the protection of argon. The heating rate was...
The basic operation methods of numerical simulation include finite element method, finite difference method, boundary element method and direct difference method. The finite element method (FEM) uses the variational principle and the weighted residual method to discretize the continuous solution domain into a group of finite element combinations for...
After the ductile iron test bar is taken out of the box, the angle grinder is used to cut the test bar from the inner runner, and then the burr and sand sticking on the test bar are removed. The parts of each test bar less than 40mm from...
Ordinary clay sand molding is adopted, and the molding process includes mold processing, sand mixing, sand pounding, box turning, vent hole, mold lifting and finishing. The test bar molds with a height of 300 mm and diameters of Φ 10 mm, Φ 20 mm, Φ 30 mm, Φ 40...