What information does a hardness test reveal?

We are surrounded by metallic products, and in fact, they are part of the basic things we make use of in our daily lives. Many of them, we think are worthless – trailer hitches, lamp posts, sculpture and etc. are produced in the foundry.

Before these materials are suitable for usage, they must go through a series of processes which include hardness testing.

What then is Hardness Testing?

Hardness testing is the process by which a material, most especially metal, can be proven to be suitable for a particular use.

Therefore, hardness testing can be defined as the process by which a material is subjected to indentation by another material that is harder, in other to measure its resistance to permanent deformation.

Hardness testing, in other words, can be defined as the test carried out in other to ascertain the degree to which a particular material can resist deformation by another material’s penetration, usually harder than the one tested.

Therefore, we can say that it is categorically a test of strength, wear-resistance and ductility of a material, to ascertain the suitability of the material.

Why is Hardness Testing necessary?

Basically hardness test is a test of quality. That simply means that hardness testing is a test of character in relation to strength and suitability.

Technically, the test is carried out in the foundry – a place where metals are cast. It is used to determine the characteristics of metals after they have been cast.

READ  What is the Rockwell hardness test?

What information does a hardness testing provide?

After a metal has been cast in the foundry, it is really necessary to test its hardness. Therefore, after casting metals, the next thing before they are used is a hardness test. After the test, the result reveals the following information, among other things, as regards the material:

  • The property of the material
  • The suitability of the material
  • The ductility of the material
  • The resistance of the material to mechanical wear

Hardness test has the ability to determine if a material has the essential property for the purpose intended.  The properties of metals have they have cast vary with respect to the composition of each metal, heat treatment, and conditions.

It is very essential to ascertain cast metals as being perfect for the intended final application.

 

Categories of required results  

  • Strength
  • Impact
  • Hardness
  • Corrosion resistance

These four are necessary to certify any material as suitable for the purpose intended.

 

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