(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...
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...
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 as cast nodular iron with MS = 0.25cm, 0.50cm and 1.25cm were austenitized and water quenched respectively. Fig.1 shows the position of probe measuring points for carbon content in martensitic structure (austenite at high temperature) between two adjacent graphite spheres in water quenched matrix. The measuring points are...
Carbon content in bovine eye ferrite The microstructure of as cast ductile iron with MS = 0.25cm consists of 73.7% pearlite and 26.3% bovine eye ferrite. The carbon content in bovine eye ferrite was analyzed by EPMA. The measuring point was located at the center of bovine eye ferrite,...
Chemical composition of nodular cast iron Qt400-18 nodular iron is selected for the study of austenitizing and austempering treatment in this test. Raw and auxiliary materials for melting ductile iron It is very important to master the chemical composition of raw and auxiliary materials for smelting and to calculate...
In the 1930s, the isothermal quenching heat treatment technology was put forward in the United States through the isothermal transformation of steel. In the 1940s, the technology was applied to gray cast iron. In the 1950s, International Harvester company tested it on Nodular Iron and obtained higher performance ductile...
Sand cores are used to form the inner cavity, the hole and the parts that cannot be realized by the outer mold. Most of the sand cores in the intake cylinder will be covered with three or more working faces by molten iron. Under the thermal action of high...
Process design parameters are some parameters related to the pattern and core box manufacturing size, which have a direct impact on the final casting dimensional accuracy. The important process design parameters of intake cylinder are: casting shrinkage, parting / core negative number, machining allowance, mold lifting angle, etc. most...
The casting process plan mainly includes the selection of molding method, pouring position and parting surface. The determination of casting process scheme is based on the full analysis of casting process characteristics of part structure, combined with actual production equipment and technical conditions. Pouring position refers to the state...