The properties of tensile samples were tested by a universal testing machine controlled by microcomputer, and the tensile strength and lower yield strength of each sampling part were tested. With the different sampling locations, the tensile strength and yield strength of cast steel castings produced by the same foamed...
Six groups of samples were taken when analyzing surface carburization, and the location of the test point was changed to the center of the sample section, so as to analyze the volume carburization and carbon content test results inside the casting. It can be seen that the influence degree...
In this test, 6 test pieces were poured in the same ladle of molten steel. The chemical composition of molten steel was detected before pouring, and the initial carbon content was 0.09%. After casting is completed and the casting is cooled down, the box is opened for sand dropping,...
In order to study the carburization defects of steel casting for bridge support, four sampling locations are selected, namely, near the inner gate, the center of the casting, the rib plate part and the top of the casting (the part connected with the riser), which are numbered as a,...
Firstly, the mechanism and manifestation of carburization defects in steel castings are described, and then the experimental methods and main masters of the research on Carburization defects of steel castings for bridge bearings are planned, and the detection and verification are carried out through the tests, and the following...
The filling process of lost foam casting is the replacement process of metal liquid and foam pattern. Because the pouring temperature of molten steel is high (above 1550 C), the gasification and cracking of foam pattern are relatively sufficient, resulting in a large amount of elemental carbon. Carbon diffuses...
In order to study the impact resistance of steel castings at different temperatures, three temperature detection conditions, namely normal temperature, – 20 ℃ and – 40 ℃, were set for impact test by using impact testing machine and impact test cryogenic tank. The impact toughness of the same foam...
The carburizing defects of steel castings can be divided into surface carburization, volume carburization and local carburization. Surface carburizing: during the filling process, due to the pyrolysis and gasification of the foam pattern, an air gap layer is formed at the front of the molten steel, and the air...
Lost Foam Casting (LFC) has been recognized by the foundry industry for its unique technological advantages. Many developed countries have applied EPC technology to the production of various products on a large scale. However, the carburization defect of EPC casting has seriously restricted the development of EPC process in...
After entering the 21st century, a large number of domestic researchers still solved the problem of carbon enhancement. According to Zhang Fuwen’s research, the process design scheme of the combination of gating and riser can greatly reduce the carburizing defects. The principle is to make most of EPS burn...