In our production live, tungsten spheres have many important effects on us. At present, the main performance indexes of tungsten alloy balls are fracture state, metallographic organization, physical and mechanical properties and sphericity error, surface roughness, and so on. The more difficult to control in the deep processing is the sphericity error. The measurement of removal rate, sphericity error, and surface roughness of tungsten spheres is the main focus of testing. So how do determine the tungsten ball organization and properties? Let's take a look.
The following is a list of contents:
l Fracture inspection of tungsten alloy balls
l Metallographic examination of tungsten alloy balls
l Physical and mechanical properties of tungsten alloy balls
Fracture inspection of tungsten alloy balls
The fracture condition of a tungsten alloy ball is closely related to its quality, and in most cases, a normal fracture indicates a good quality of tungsten carbide. Fracture inspection is one of the simplest, quickest, and most practical ways to detect the internal organization of cemented carbide. Cemented carbide fracture is a brittle fracture and has finer grains than other metallic materials, resulting in a smoother and more detailed fracture shape. Defects in the organization and structure can be shown in the alloy fracture.
Fracture inspection of tungsten alloy balls is usually performed under a binocular vertical microscope at 25-50x. The fracture surface should be free of oil, sweat, and other dirt that may affect observation, and should also have the largest possible fracture area. The fracture inspection can determine defects such as dirty holes, decarburization, carburization, under-fired, over-fired, mixed material, and unpressed. When these defects occur in a tungsten sphere, then its mechanical properties will be significantly reduced, seriously affecting its performance and thus the life of mechanical parts.
Metallographic examination of tungsten alloy balls
The metallographic examination of tungsten alloy balls can not only determine the quality of the alloy but also infer the production process of the alloy. The metallographic inspection starts with the preparation of specimens, which are made into metallographic grinding discs after rough grinding, mounting, fine grinding, polishing, and fine grinding. Rough grinding with a coarser silicon carbide grinding wheel, the surface should be ground 2 ~ 3 mm to test the internal organization of the alloy. The rough grinding specimen will be set into the sample ring with quick glue when mounting. All ground surfaces should be in the same plane when mounting the sample. The sample ring with the sample inlay is placed on a special grinding device for fine grinding to eliminate the abrasion marks produced during coarse grinding.
Polishing can be done on a similar fine grinding device with a canvas pad on the grinding disc and a drop of abrasive, which should give a bright grinding surface without any streaks. Then further on the iron disc with tweed cloth block fine grinding, to eliminate the abrasive film formed during polishing, in the process of fine grinding from time to time to the abrasive and lubricant dripping into the grinding disc. After fine grinding, the grinding disc is as bright as a mirror. The uncorroded grinding discs can be observed under double magnification to determine the porosity, dirtiness, graphite inclusions, and other defects of the tungsten alloy balls, such as delamination, cracks, unpressed, under-or, over-fired, etc.
Physical and mechanical properties of tungsten alloy balls
The physical and mechanical properties of tungsten alloy balls include specific gravity, coercive magnetic force, Rockwell hardness, bending strength, compressive strength, impact toughness, and so on. The specific gravity is measured according to Archimedes' principle, the coercivity is measured by magnetizing and then demagnetizing the tungsten ball, the hardness is measured by the A scale, and the flexural and compressive strengths and impact toughness are measured on an impact tester. After this series of measurements, the tungsten alloy balls are tested for their properties.
Above is the information about the determination of tungsten alloy ball organization and properties. If you are interested in tungsten alloy balls, tungsten spheres, tungsten ball pens, or other cemented carbides, you can contact us. Our company focuses on the development of cemented carbide, mining machinery, engineering tools, auto parts, new energy, leisure sports equipment, and other our company focuses on the development of cemented carbide, mining machinery, engineering tools, auto parts, new energy, leisure sports equipment, and other industries. Our website is https://www.7jinxin.com/. We are very much looking forward to your arrival and hope to cooperate with you.
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