Question regarding Brinell/Vickers Hardness Test

In summary, the different hardness tests are used to determine the hardness of a material. Pure metals are generally softer than alloys, and the force required to deform the material varies depending on the hardness of the material. Rockwell Hardness Test is the most common test, and it is used to determine the hardness of metals.
  • #1
ecstacynight
2
0
Vickers Hardness Test
Question : For Vickers Hardness Test to test the material hardness we uses different force [kfg], Why do we need to use different force like 1kgf and 5kgf?

Brinell Hardness Test
Question : Pure Copper : Require force is 62.5
Steel : Require force is 187.5
Why is there a change in the force require?
 
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  • #2
ecstacynight said:
Vickers Hardness Test
Question : For Vickers Hardness Test to test the material hardness we uses different force [kfg], Why do we need to use different force like 1kgf and 5kgf?

Brinell Hardness Test
Question : Pure Copper : Require force is 62.5
Steel : Require force is 187.5
Why is there a change in the force require?
Pure metals are generally softer than alloys. Pure copper would be softer than steel, but steel is a rather general category, and there is a range or spectrum of hardness.

We use different loading forces depending on the softness of the materials. Softer materials require less force to achieve a certain deformation, while harder materials resist deformation and require a higher load/force to achieve a certain deformation. Each test is based on a certain geometry of the indentation within some limited range.

Note there are several hardness tests, and they can be correlated.

Rockwell Hardness Test
Stanley P. Rockwell invented the Rockwell hardness test. He was a metallurgist for a large ball bearing company and he wanted a fast non-destructive way to determine if the heat treatment process they were doing on the bearing races was successful. The only hardness tests he had available at time were Vickers, Brinell and Scleroscope. The Vickers test was too time consuming, Brinell indents were too big for his parts and the Scleroscope was difficult to use, especially on his small parts.
. . . .

See - http://www.instron.us/wa/applications/test_types/hardness/default.aspx
 
  • #3
Thanks that was useful :D
 

1. What is the difference between Brinell and Vickers hardness tests?

The Brinell and Vickers hardness tests are both methods used to measure the hardness of a material. The main difference is the type of indenter used. The Brinell test uses a hardened steel ball while the Vickers test uses a diamond pyramid. The Brinell test is better for softer materials, while the Vickers test is more suitable for harder materials.

2. How are the Brinell and Vickers hardness numbers calculated?

The Brinell hardness number is calculated by dividing the load applied by the surface area of the indentation. The Vickers hardness number is calculated by dividing the load applied by the surface area of the indentation squared. Both tests use a standardized formula to ensure accurate and consistent results.

3. What materials can be tested using the Brinell and Vickers methods?

The Brinell and Vickers hardness tests can be used on a wide range of materials, including metals, plastics, and ceramics. They are commonly used in the manufacturing industry to test the hardness and strength of materials used in various products.

4. Are there any limitations to the Brinell and Vickers hardness tests?

One limitation of the Brinell and Vickers tests is that they can only be used on flat surfaces. The indentation size may also be affected by the surface roughness of the material being tested. Additionally, the tests may not accurately measure very thin or very hard materials.

5. How do the Brinell and Vickers hardness tests compare to other hardness tests?

The Brinell and Vickers tests are considered to be more accurate and reliable than other hardness tests, such as the Rockwell and Knoop tests. The Brinell test is better for larger, more coarse-grained materials, while the Vickers test is more suitable for smaller, finer-grained materials. However, the choice of which test to use ultimately depends on the specific material and its properties.

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