The deformation of any material under external load will be affected by its own microstructure and properties and external environmental […]
Firstly, the fatigue crack nucleates at the stress concentration. Under the action of stress, the fatigue crack begins to expand.
The specific test process is as follows: 1.Use WAW-Y500 universal material testing machine to measure the tensile strength of the
For gray cast iron, its mechanical properties mainly depend on the matrix structure and flake graphite in it. The shape
The instantaneous fracture zone of fatigue crack is the area where the material is unstable and suddenly fractured. Due to
It is found that the fatigue properties of cast iron are not directly related to the conventional mechanical properties of
The fatigue crack growth region is the region of stable development after fatigue crack nucleation and initiation. Fatigue bands generally
As early as the 1940s, developed countries have studied the machinability of gray cast iron. Nowadays, the cutting performance of
The fatigue crack origin region is the region where the fatigue crack nucleates and initiates. The fatigue crack first nucleates
With the development of thin-walled engine block, the engine bears higher and higher pressure, which requires higher strength and fatigue
The machinability of gray cast iron is affected by different melting methods. From a large number of research and tests,
Gray cast iron has the characteristics of low cost, good casting performance and shock absorption, The key to the further
(1) Fatigue test of ordinary HT250 lifting Faraday compression The lifting diagram of tension compression fatigue limit of ordinary HT250
The tension compression fatigue fracture morphology of low alloy HT250 with different surface roughness is shown in the figure. Figure
In order to improve the properties of gray cast iron and deeply develop the application of gray cast iron, many
Results of tension compression fatigue test of low frequency gray cast iron Among the 8 samples of low-alloy HT250 low-frequency
Casting performance: it refers to some technological properties of whether the metal or alloy is suitable for casting, mainly including
The low magnification morphology of tensile fracture of three grades of gray cast iron is shown in Figure 1. It
Gray cast iron usually refers to the cast iron with gray section and the carbon mainly exists in the form
The tensile strength of ordinary HT250 at room temperature is slightly lower than the strength calibrated by its brand, which
Gray cast iron refers to the cast iron with flake graphite. The main components are iron, carbon, silicon, manganese, sulfur
The eutectic morphology of three grades of gray cast iron samples is shown in the figure. Eutectic clusters in gray
The matrix structure of three grades of gray cast iron samples is shown in the figure. It can be seen
The figure shows the graphite morphology and distribution of three grades of gray cast iron samples. It can be seen
The tension compression fatigue tests of three grades of gray cast iron are carried out on plg-100 high frequency fatigue
Gray cast iron characterized by flake graphite has certain strength, hardness, elastic modulus, shock absorption, wear resistance and thermal conductivity,
The low-frequency tension compression fatigue test of gray cast iron adopts MTS810 axial tension compression fatigue test machine. It uses
The tension compression fatigue test of gray cast iron mainly studies the effects of loading frequency and surface roughness on
Casting refers to pouring molten metal into the mold, cooling and forming to form a casting that meets the relevant
The test materials are three grades of gray cast iron, namely ordinary HT250, low alloy HT250 and HT300, in which
