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Physical properties of YG alloy in cemented carbide

Article Source:Author:Views:issuing time:2014/2/12 14:37:45
1, coercive force
      As the cemented carbide binder phase is ferromagnetic material, so that the alloy has a certain magnetic, coercive force can be used to control the alloy structure, is an internal control of the manufacturing plant.
The main coercive force of WC-Co is mainly related to the content of diamond and its dispersion. With the decrease of cobalt content and increase.
       When the amount of cobalt is constant, the coercivity increases as the degree of dispersion of the cobalt phase increases as the tungsten carbide grains become finer. Conversely, the coercivity decreases. Therefore, coercivity can be used as an indirect measure of the grain size of tungsten carbide in an alloy under the same conditions:
    In normal-alloyed alloys, as the carbon content decreases, the tungsten content in the drilling phase increases, causing the cobalt phase to be greatly strengthened, thereby increasing the coercive force. Therefore, the larger the cooling rate at the time of sintering, the larger the coercive force.
 
2, magnetic saturation
    In the touch field, with the increase of applied magnetic field, the magnetic induction intensity of the alloy also increases. When the magnetic field strength reaches a certain value, the magnetic induction intensity no longer increases, that is, the alloy has reached the magnetic saturation. The magnetic saturation of the alloy is only related to the amount of alloy co-drilling, but not to the grain size of the tungsten carbide phase in the alloy. Therefore, the magnetic saturation can be used for non-destructive composition of the alloy inspection, or identification of the known composition of the alloy there non-magnetic ηl phase
  
3, elastic modulus
    Due to the high modulus of elasticity of tungsten carbide, WC-Co alloys also have a high amount of elastic wear. With the increase of cobalt content in the alloy, the elastic modulus decreases; the grain size of tungsten carbide in the alloy has no significant effect on the elastic modulus.
    With the use of temperature, alloy elastic modulus will be reduced.
 
4, thermal conductivity
    In order to prevent the tool from being damaged by overheating during use, it is usually desirable to have a higher thermal conductivity of the alloy. WC-Co alloy has a higher thermal conductivity, about 0.14-0.21 cards / cm · degrees · seconds,
    Thermal conductivity is generally only related to the alloy cobalt content, with the cobalt content decreased.
 
5, thermal expansion coefficient
       The linear expansion coefficient of WC-Co alloy increases with the increase of cobalt content. However, the coefficient of expansion of the alloy is much lower than that of the steel, which makes the alloy tool have a large welding pressure when it is inlaid, and if the slow cooling method is not taken, the alloy will often crack. For low strength alloy, the more prominent.
 
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