The effects of vibration frequency and amplitude on graphite morphology, primary austenite and properties of vibration lost foam casting gray […]
After laser melting, the microhardness of gray cast iron surface in different areas is divided into three obvious sections, among
Fig. 1 corresponds to the cross-sectional morphology of the surface of gray cast iron melting layer after continuous impact of
Due to the temperature gradient generated in the process of laser melting of gray cast iron and the transformation of
When the temperature in the molten pool rises rapidly, the convection inside the molten pool is strong, which adds to
In the process of rapid cooling of the molten pool, due to the extremely fast cooling speed, non-equilibrium solidification occurs
The surface structure of untreated gray cast iron sample is pearlite (P) and graphite (g). From the XRD spectrum of
The growth mechanism of tin crystal was discussed by means of lower microstructure observation and thermodynamic calculation. The effects of
Aiming at the process of producing gray cast iron engine block by sand casting, the casting process of gray cast
Through the combination of experimental simulation and experiment, the improvement effect of laser melting, laser shock and graphitization annealing process
There are many factors that cause slag hole defects, such as raw material composition of gray cast iron, slag removal
The combination of laser melting, laser shock and graphitization annealing process of gray cast iron was applied to the study
Slag hole (including sand hole) is also one of the common defects of gray cast iron cylinder block produced by
The results show that the graphitization annealing of white cast iron takes a long time. When annealing at 800 ℃,
Most of all kinds of porosity casting defects are located in the key parts of the cylinder block, and the
Although the surface hardness of gray cast iron after laser melting and impact is greatly improved, the microstructure toughness of
Porosity casting defect has always been the most common defect in sand casting gray iron castings. It refers to the
The solidification process of iron carbon alloy plays a decisive role in its final structure. Depending on the cooling rate,
(1) Effect of amplitude on hardness of gray cast iron Figure 1 shows the change curve of Brinell hardness of
Through the experimental study of laser melting and laser melting impact on gray cast iron, the changes of microstructure and
By imitating the surface characteristics of wear-resistant organisms, the bionic non smooth surface morphologies of point, strip and mesh are
The cylinder block is the framework of the automobile engine, with thin wall and complex structure. In the casting production,
The existence of flake graphite in the middle layer of gray cast iron seriously affects the improvement of its properties.
The graphite morphology in gray cast iron has obvious influence on the fracture process and mechanism of gray cast iron.
The figure shows the matrix structure of gray cast iron. Among them, figures (a) – (d) are the matrix structure
Fatigue wear failure of gray cast iron is a phenomenon that metal is removed from the contact area under the
For the surface of gray cast iron treated by laser alloying, the microstructures of different mixed alloy powders are obviously
The figure shows the morphology of primary austenite of gray cast iron prepared under different amplitudes. Figures (a), (b), (c)
The microstructure is the main factor affecting the fracture morphology and fracture mechanism of metal materials. The notch effect at
Since the 1990s, researchers have carried out a lot of research on the surface modification of gray cast iron, among
