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However, the temperature of liquid phase leaving the interface changes linearly due to heat conduction(corundum abrasive wholesale suppliers south korea). The actual undercooling amount in the liquid phase at different distances from the interface front is different, the undercooling amount near the interface decreases, and the maximum undercooling amount appears in the liquid phase at a certain distance from the interface(alumina grit). 


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In addition to thermal undercooling, there may also be a phenomenon of "component undercooling" at the front of the alloy solidification interface, which depends on the crystallization properties and solute diffusion properties of the alloy(steel grid). Therefore, the supercooling distribution caused by solute enrichment deviates from the thermal supercooling distribution, that is, component supercooling occurs(corundum abrasive wholesale suppliers south korea). 


Component supercooling can promote the nucleation of molten liquid at the position where it leaves the interface and has the largest undercooling, and separate out the solid phase and grow in isolation (commonly referred to as internal growth)(aluminium oxide shot blasting grit). This phenomenon can lead to the change of solidification interface morphology and solidification microstructure(corundum abrasive wholesale suppliers south korea). Stone is a special constituent phase in gray cast iron.


Graphite crystal has hexagonal lattice structure, and carbon atoms occupy each corner of hexagonal prism(220 grit aluminum oxide blast media). The cell lattice contains a base plane and a prism plane(corundum abrasive wholesale suppliers south korea). The base plane is the atomic dense plane in the crystal (atomic spacing is 14.21) × 10m), in which the carbon atoms are connected by covalent bonds with strong binding force, the binding energy is about 293-335kj / mol, and the atoms are firmly bonded.


The crystallographic symbol of this crystal surface is (0001), and its product direction [0001] is generally referred to as e direction(garnet sand). The atomic spacing of prismatic surface is 33.54 × 10m, the atomic layers are bonded by polar bonds, and the atomic binding energy is 70kj / ml(aluminum oxide blasting grit). Different growth steps make the crystal grow according to different modes(corundum abrasive wholesale suppliers south korea).


The orientation difference of adjacent core cylinder is 60 °, and (1010) is the representative crystal plane. [1010] product direction is generally referred to as direction a(corundum abrasive wholesale suppliers south korea). This structure of graphite makes its strength at a very low level(aluminum oxide blasting abrasive). The liquid iron atoms near the interface between austenite and liquid phase are supersaturated, and austenite continues to crystallize until the eutectic transformation is completed.


Flake graphite(aluminum oxide abrasive media). Therefore, these flake graphite crystals are formed by the superposition of many flake crystals. There are many substructures between lamellar crystals. It is found that there are always many crystal defects in the graphite crystal of ordinary cast iron due to the trapping of impurity atoms and the limitation of crystallization conditions(corundum abrasive wholesale suppliers south korea). Some specific crystal defects can provide growth steps for graphite growth.


For example, spheroidal graphite(aluminium oxide blasting grit). Moreover, spheroidal graphite close to the spherical outline appears in the spheroidized cast iron(black silicon carbide). Observing the deep corrosion, hot oxygen corrosion and ion corrosion samples under the scanning electron microscope, it can be seen that the surface of spherical graphite is extremely uneven, the surface presents local bulges and depressions, and there are deep grooves and holes(corundum abrasive wholesale suppliers south korea). 


However, after ion bombardment on the graphite sphere, there is a ring like feature on the section of the sphere(corundum abrasive wholesale suppliers south korea). The internal structure of spherical crystal is loose. Most of the identified core materials are composed of oxides and sulfides, and there are also complexes of these compounds(corundum sand). It can be seen from Figure 4 that the carbon activity of molten iron with the same temperature increases with the increase of carbon concentration. 


The annual ring morphology shows the texture of the surface orientation of graphite crystal (0001). Transmission electron microscopy revealed the multiparticle structure of spherical graphite(corundum abrasive wholesale suppliers south korea). Graphite spheres contain many single crystals with three-dimensional radial distribution(150 grit aluminum oxide). Graphite crystals grow radially outward from a common core along the lattice [0001] direction to form many cone-shaped single crystals.


In the liquid-solid coexistence region of the co product, the activity is still equal to L. Beyond this range, it gradually becomes a random distribution with the increase of distance(aluminium oxide blast media). This ordered arrangement of atoms within atomic groups is called short-range order(corundum abrasive wholesale suppliers south korea). If the solute can not diffuse sufficiently, the liquid solidification temperature near the interface will change in a curve due to different solute concentrations.


For example, M.J. Hunter observed the hot oxygen corrosion sample under the transmission electron microscope and saw that there were fine flake graphite in the center of spherical graphite(corundum abrasive wholesale suppliers south korea). Compared with the observation results of polarized light, they found that there was a linear or branched dark substance in the center of each spherical graphite, and confirmed that the observed dark substance was flake graphite(240 grit aluminum oxide). 


For the graphite crystal close to the center, its (0001) product plane is perpendicular to the radiation direction, and gradually becomes a tangent plane to the sphere outward(green silicon carbide). Cooling rate, crystallization environment, crystallization conditions and alloy properties have a direct impact on the phase transformation undercooling of the alloy(aluminum oxide anti slip grit). There are nearly hexagonal crystal growth spirals on the surface(corundum abrasive wholesale suppliers south korea). 


Through various investigations, it can not be confirmed from the crystal structure or morphology that the growth of spherical graphite polycrystal starts from this small amount of flaky stone without specific shape(alumina blasting). Later, it was found that the composition and structure of spherical graphite core material are diverse, and no specific core structure was found to make graphite spherical(corundum abrasive wholesale suppliers south korea). 


The graphite structure is shown in Fig. He suggested that this kind of flake graphite at the heart of graphite sphere is common(glass bead blasting media suppliers). Therefore, what is said here cannot confirm any specific core structure enough to make the stone tools spherical. People also put forward some relevant mechanisms(corundum abrasive wholesale suppliers south korea). Some researchers have proposed that this kind of flake graphite located in the heart of graphite sphere is common. 


However, some compounds also contain nitrogen, aluminum, dark and other elements(fine grit aluminum oxide). Because the crystal structure of these substances has a certain lattice matching relationship with the crystal structure of graphite, carbon atoms are deposited on them, and further growth can become the crystal core of graphite(corundum abrasive wholesale suppliers south korea). Subcooling caused by dynamic factors is often called physical subcooling or thermal subcooling.


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