Hard alloy one by one or several carbides (such as TiC, WC etc.) as the hardening phase, the alloy steel (such as high-speed steel, chrome molybdenum steel etc.) powder as binder, called hard alloy steel structure. Its hardness is between steel and hard alloy, but toughness is greatly improved, and it can be machined by cutting and heat treatment. The typical hardness of the steel structure carbide is: Quenched and tempered, the hardness is 69~73HRC, high speed steel 65%.
Hard alloy is a metal, through hardness test can reflect the difference of hard alloy material on the mechanical condition of organization structure and heat treatment process of different chemical components, the accuracy of the research and new material inspection and supervision of heat treatment hardness test is widely used in the performance of the hard alloy.
Characteristics of hardness testing of cemented carbide
The hardness test of cemented carbide is that it belongs to non destructive test and the test method is simple. The hardness test of cemented carbide is adaptable to its shape and size, and the test efficiency is high. In addition, there is a corresponding relationship between hardness and other physical properties of cemented carbide materials.
For example, cemented carbides, hardness tests, and tensile tests are basically tests for metal resistance to plastic deformation. These two tests are, to some extent, similar to those of metals. Therefore, the detection results can be compared with each other. The tensile test equipment for cemented carbide is large and complex. It is necessary to prepare specimens and test efficiency is low. For many metal materials, there is a conversion table for hardness test and tensile test. Therefore, hardness test is more and more used in testing the mechanical properties of cemented carbide materials, while tensile test is seldom used.