Vickers hardness (Hv), also known as indwelling hardness, is more accurate than Hm hardness (relative hardness). Vickers hardness and Hm hardness can be converted into each other through calculation. Websler hardness refers to the hard steel indenter of a certain shape, which is pressed into the sample surface under the action of standard spring test force. The indenter depth of the indenter is used to determine the hardness of the material, and the indenter depth of 0.01mm is defined as a websler hardness unit.
The websler hardness
unit is called HW. Websler is a portable, small, light weight instrument that can be operated with one hand. It can quickly, conveniently and nondestructively test the hardness of materials. It does not need sampling and requires little operation skill. It is very suitable for rapid hardness testing of materials on production site.
A diamond normal pyramid pressure head with an Angle of 136 degrees between relative surfaces is pressed into the surface of the tested sample under the action of specified load F. After a fixed time, the load is removed, the diagonal length of indentation d is measured, and then the indentation surface area is calculated. Finally, the average pressure on the indentation surface area is calculated. This is the vickers hardness value of the metal, denoted by the symbol HV. In the actual measurement, there is no need to calculate. We can directly consult the table to get the measured hardness value according to the measured d value.
With a load of 49.03~ 980.7n, the square conical diamond indenter with an Angle of 136° on the opposite side of the phase was pressed into the surface of the press material. After keeping it for a specified time, the diagonal length of the indentation was measured, and then the hardness was calculated according to the formula.