The preparation of metal semi-solid slurry is the key link of its processing technology, which is directly related to the quality and performance of semi-solid parts. Semi solid slurry requires stable spherulites or near spherulites with uniform and fine non dendritic structure. At present, the main semi-solid slurry preparation...
Figure 1 shows the tensile yield strength, tensile strength and elongation of T6 alloy at room temperature and high temperature. It can be seen from Fig. 1A that the yield strength of the alloy decreases with the increase of temperature and increases with the increase of Y content. The...
Figure 1 shows the aging hardening curve of Mg – 0.43nd – XY – 0.08zn – 0.11zr alloy at 200 ℃. With the increase of Y content from 0 to 0.12%, the peak hardness increases slowly from 71 hv to 74 HV. The addition of Y prolongs the time...
Figure 1 shows the optical structure of Mg – 0.43nd – XY – 0.08zn – 0.11zr alloy after solution treatment. With the increase of Y content from 0 to 0.12%, the grain size of the alloy decreases from 70 μ m to 49 μ M. When y element is...
Figure 1 shows the microstructure of as cast Mg – 0.43nd – XY – 0.08zn – 0.11zr alloy. It can be seen from the figure that the as cast microstructure of the alloys with different compositions is composed of α – Mg matrix and eutectic phase at the grain...
In recent years, rheological forming technology also has a lot of research and application. University of Brunel, UK Fan et al. Studied the rheoforming by using the double helix mechanical stirring method. Due to the double helix mechanical device, the alloy melt can obtain high turbulence intensity and high...
At present, the forming technology of bucket teeth mainly includes sand casting, metal mold casting, lost foam casting and liquid die forging. 1. Sand casting The common sand mold casting bucket tooth is the main bucket tooth forming technology now, because this kind of craft uses the sand core...
The effect of phosphorus on the shrinkage defects of castings is shown in two aspects: one is that phosphorus, as a graphitization promoting element, can increase the graphite expansion in cast iron, and it can also improve the fluidity of molten iron, both of which can improve the feeding...
The composition control of molten iron plays a very important role in the process design of casting anti shrinkage. Zhang Ruifen, a senior engineer of zhycasting, thinks that the main influencing factor of shrinkage defect is the chemical composition of cast iron, while Li Shuhui, a senior engineer of...
Casting can also be divided into gravity casting and pressure casting according to the pouring process of liquid metal. Gravity casting refers to the process of injecting molten metal into the mold under the action of the earth’s gravity, also known as casting. Gravity casting in a broad sense...