What is the Vickers hardness test?

In 1925, two British men developed a Vickers (HV) hardness test that uses mechanical power to determine the hardness of metals or other materials. The strength generally leaves a visible impression that the technicians measure to obtain the pyramid number of the Vickers, the number from zero to 900. The higher the number obtained on the Vickers Hardness test, the heavier the material.

The first part of the Vickers hardness test consists in using a bit with a diamond tip that leaves an impression on the material tested. The tip of the bit has a microscopic shape of a pyramid based on a square. Some people refer to a test as a hardness test of diamond pyramids or VAT due to the tip shape. In larger testing devices, the bit is located in a drilling tool that is lowered on the test object. The tip of the bit causes contact with the material and technicians to apply the controlled amount of force for 10 to 15 seconds.

Testers use a digital breakup to indicate the amount. After removal of bits has a test object reversedPyramid -shaped indentation. The printing applies anywhere from £ 2.2 to £ 220.5 (1 to 120 kilograms) of permanent pressure and the industry uses this power to test the hardness of everything from gems to metals. The MicroHardness Vickers test usually uses 0.022 to £ 2.2 (10 to 1,000 grams) of permanent force. The industry uses microtest to determine the hardness of thinner materials and special coatings.

Using a specially designed microscope, the technician measures the length of both diagonals of the impression and average numbers. They determine the hardness number using conversion tables or software for Vickers hardness testing. The number is obtained by dividing the amount by diagonal diagonal diagonal and is written in a specific format such as 500HV/15. Number 500 indicates the level of hardness and 15 indicates that the force has been applied for 15 seconds.

Vickers hardness test devices can be hand -held devices or free -standing computer machines. TransmissionNo, pocket testers have application devices connected to a small digital monitor of deduction. The bench-top version resembles large microscopes with a diamond battle located on a revolving goal. These tools apply the required amount of force, allowing technicians to measure the impression of placing microscopic lines on enemy diagonals. Internal software in most Vickers test devices automatically performs hardness calculations.