Vickers Hardness
Vickers hardness measures the hardness of a material using a pyramidal diamond indenter. The hardness is calculated from the quotient of the test force and the surface area of the indentation.
Physical-Chemical Mechanism of Action
Vickers hardness is determined by pressing a pyramidal diamond indenter into the material. The indenter has an apex angle of 136 degrees and creates an impression under load. The hardness is calculated from the applied force divided by the surface area of the permanent indentation.
Metallurgical Relevance & Welding Risks
Vickers hardness is an important measure of hardness for steels and other metals. Too high hardness can lead to fracture risk, while too low hardness makes the material too soft and loses toughness. During welding, it is critical that material hardness remains in an optimal range to ensure a safe and durable joint.
Workshop Practice & Instructions
To measure Vickers hardness, a special microscope is used. The test force is given in newtons (N), and the result is expressed as a hardness number HV. For steel, a hardness target of 200 to 450 HV is typical. If hardness is too high, the weld can be prone to cracking, while too low hardness makes the material too soft and loses toughness.