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Cemented Carbide Introduction

2016/6/2      view:
1.Hardness( IS0 3738 and lS0 3878)

Hardness is the capability of the material resisting the localized plastic deformation. The hardness of cemented carbide unusually is measured by Rockwell and Vickers. lt is important to note that the two methods are different, the converting from one system to the other should be take care.

2.Fracture toughness

Fracture toughness is the capability of the material resisting the unstable propagation of crack. The value depends on the material composition, microstructure. lt is the representations of the combination properties of the materials.

3.Transverse rupture strength( IS0 3327)

Transverse rupture stress is the ability of the bending and cracking resistance of the materials. lt is the stress measured at the ruptured point of a material in the standard three-point bending test. When the test is applied to cemented carbide, a standard loaded fixture and a sample(Φ3.25mm x38.7mm) is used. The average of several measured values is taken as the measured value. The value can vary much with the geometry and surface status of the sample and testing equipment. ln particular, the test is sensitive to the surface finishing, surface residual stress, surface corrosion and the internal defects of the materia1. lt should be noted that TRS could not be taken as the only standard for the selection of a grade.

4.Density( IS0 3369 )

The density(specific gravity) of a material is the relation mass to volume. lt is determined by the water displacement method(Archimedean Principle). Density is usually used to determine whether the composition of a grade is correct. What differs from common understanding is that the porosity of cemented carbide can not be determined by the measurement of the density. The density of tungsten carbide(WC) is15.7g/cm3 and density of cobalt is8.9g/cm3. As regards WC-Co grade, the density will decrease with the increase of cobalt content.