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With the increase of silicon content, eutectic carbon content decreases and austenite liquidus moves to the left(aluminium oxide sandblasting suppliers nigeria). When silicon in Fe-C alloy is 2% or 4%, the maximum solubility of carbon decreases to 1.7% or 1.4% respectively. According to the above formula, for gray cast iron with w (CE) = 4.6%, the initial precipitation temperature of primary graphite is about l287 ℃. 


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At the same time, the a single-phase region and a + y two-phase region also change(glass bead blasting media suppliers). In addition, the carbon content at eutectoid point is reduced to 0.6% and 0.4%, the eutectoid transition temperature increases with the increase of silicon content, and the transition temperature range is expanded accordingly(aluminium oxide sandblasting suppliers nigeria). The phase boundary of Y single-phase region shifts to the left(120 grit aluminum oxide). 


Iron and carbon atoms migrate in a short distance and undergo site chemical reaction(aluminium oxide sandblasting suppliers nigeria). Carbon atoms and iron are synthesized into cementite(black aluminum oxide). In the production environment, the actual cooling rate of cast iron during cooling and solidification is usually higher than the equilibrium cooling rate. This temperature is the liquidus temperature of Hypereutectic molten iron transformed according to the stable system.


Because the molten iron contains other chemical components besides iron, carbon and silicon, the molten iron is oxidized and polluted in the smelting process(alumina abrasive powder), so that the actual phase transformation critical point and phase zone range of cast iron are different from the equilibrium phase diagram(aluminium oxide sandblasting suppliers nigeria). It can be seen that after forced deoxidation, the precipitation temperature of primary austenite decreases significantly.


When the following Fe-C alloys are added with silicon, the critical temperature of Eutectic Transformation in stable system increases and that in metastable system decreases(aluminium oxide blast media). These data come from the characteristic points of cast iron cooling curve under different solidification environments, which is very useful for practical production(aluminium oxide sandblasting suppliers nigeria).


However, when the cooling rate of the alloy is high, the iron atoms can not be fully evacuated, and the movement of carbon atoms is also limited(pink corundum). These factors will make the phase transformation parameters and solidification microstructure of cast iron deviate from the pure alloy(aluminium oxide sandblasting suppliers nigeria). The solidification data of gray cast iron sampled and measured at the production site are compared with the data shown in the phase diagram.


For example, in this case(aluminum oxide sandblasting media), the data include the initial precipitation temperature of primary austenite, the initial precipitation temperature of primary graphite of Hypereutectic gray cast iron, the initial precipitation temperature of primary cementite of Hypereutectic white cast iron, the eutectic transformation temperature and eutectic carbon content of gray cast iron and white cast iron, and the austenite solidus temperature of gray cast iron(aluminium oxide sandblasting suppliers nigeria).


And the solidification of Hypoeutectic gray cast iron generally begins with the precipitation of primary austenite(aluminium oxide sandblasting suppliers nigeria). The initial precipitation temperature of primary austenite in industrial cast iron generally deviates from the corresponding equilibrium temperature of iron carbon silicon alloy(1200 grit aluminum oxide). In addition to kinetic factors, the reason for this phenomenon is also related to the oxidation of molten iron due to melting and overheating in air.


The temperature data of curve L in the figure is taken from the cooling curve of molten iron melted and superheated to L450 ℃ under the protection of argon(aluminium oxide sandblasting suppliers nigeria). The charge is high-purity pig iron, steel, ferrosilicon and carburizing agent(green silicon carbide). Therefore, in Fe-C-Si system, liquid phase + austenite + graphite (or cementite) or ferrite + austenite + alkali infiltrate can coexist in a certain temperature range.


The relationship between the initial precipitation temperature (T) of primary austenite and carbon silicon content is as follows(aluminium oxide shot blasting grit): melting the same charge in a closed furnace, but introducing CO to force the oxidation of molten iron, the initial precipitation temperature of primary austenite increases, as shown in the curve in the figure(aluminium oxide sandblasting suppliers nigeria). 


The discussion covers a wide range(aluminium oxide blasting), including the liquid structure of cast iron, the precipitation behavior of main constituent phases of cast iron and the formation principle of common phase, the solid phase transformation of cast iron and the micro essence of special iron inoculation(aluminium oxide sandblasting suppliers nigeria). This formula shows that the liquidus of Hypereutectic gray cast iron is steep in the phase diagram(aluminum oxide sandblasting abrasive). 


In order to further compare the effect of molten iron oxidation, the molten iron after forced oxidation was deoxidized with w (AL) > 0.01%, w (mg) > 0.04% or E (CE) > 0.015%, melted under argon protection and superheated to L450 ℃, and the data of curve 3 in Fig. 7 were measured(black silicon carbide). In fact, it shows the relationship between the initial precipitation temperature of cementite and carbon content of Hypereutectic white cast iron(aluminium oxide sandblasting suppliers nigeria).


Initial precipitation temperature of primary austenite (liquidus of Hypoeutectic gray cast iron). Other melting conditions, such as furnace type, melting mode, pretreatment process and scrap addition, will also affect the initial precipitation temperature of primary austenite(aluminium oxide sandblasting suppliers nigeria). The initial precipitation temperature of primary austenite and its growth temperature interval are important factors affecting the microstructure of cast iron(aluminum oxide anti slip grit).


For example, for eutectic and hypoeutectic gray cast iron, the high superheat temperature of molten iron (more than 1450 ℃), the long holding time of molten iron at high temperature, the rusty scrap contained in the charge, and the strong oxidation of cupola air supply will increase the initial precipitation temperature of primary austenite(aluminium oxide sandblasting suppliers nigeria). The results are as follows(aluminum oxide blasting abrasive): this formula draws curve 4.


The precipitation temperature of primary graphite in hot metal with high carbon equivalent is higher(aluminium oxide sandblasting suppliers nigeria). Therefore, the eutectic transition temperature can be reached only when the temperature decreases by about L30 ℃. Comparing curve 3 and curve 4 in the figure, it can be seen that when w (CE) is low, the temperature data of hot metal from the site is higher than that of laboratory samples(garnet sand); The opposite occurs when w (CE) is high.


This is a wide crystal growth temperature range in which graphite can grow into coarse crystals(alumina blasting). Precipitation temperature of primary cementite in hypereutectic white cast iron (liquidus of Hypereutectic white cast iron)(aluminium oxide sandblasting suppliers nigeria). The raw molten iron of near eutectic cast iron and nodular cast iron with (CE) = 3.9% ~ 4.6% and malleable cast iron with = (CE) = 2.75% ~ 3.1% were sampled and measured at the production site(100 grit aluminum oxide). 


Precipitation temperature of primary right ink in hypereutectic gray iron (hypereutectic gray iron liquidus). For gray cast iron, this temperature has the following relationship with the carbon and silicon content of molten iron(steel grid). The figure shows the initial precipitation temperature 1 of primary austenite in molten iron with different carbon equivalent under several melting conditions(aluminium oxide sandblasting suppliers nigeria).


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