Testing method of workpiece hardness heat treatment

Surface hardening, heat treatment commonly used induction heating or flame heating manner. The main technical parameters of surface hardness, hardness and effective local hardened layer depth. Hardness testing Vickers hardness tester can also be used or Rockwell Superficial Rockwell hardness. Test Force (ruler) of choice and effective case depth and hardness of the surface. This involves three kinds of hardness.

Vickers hardness test heat is an important means of surface hardness, it can choose the test force 0.5 ~ 100kg, testing thin 0.05mm thick hardened surface layer, which is the highest precision, can distinguish the surface hardness of heat minor differences. In addition, the effective case depth gauge should be detected by the Vickers hardness, so, for surface heat treatment or extensive use of the workpiece surface heat treatment units, equipped with a Vickers hardness tester is necessary.

Rockwell hardness of the surface is also very suitable for testing the hardness of the workpiece surface hardening, surface Rockwell hardness scale, there are three to choose from. You can test the effective hardening depth of more than 0.1mm of various surface hardening artifacts. Although Rockwell hardness of the surface accuracy is not high Vickers hardness, but as the heat treatment plant quality management and testing tools to check eligibility, has been able to meet the requirements. Moreover, it also has a simple, easy to use, low price, rapid measurement, hardness value can be read directly, etc., using surface Rockwell hardness can heat the surface of the workpiece bulk piece by piece to detect fast lossless. This has important implications for metalworking and machinery manufacturing plant.

When the surface of the heat-treated hardened layer is thick, may also have a Rockwell hardness. When the heat hardened layer thickness 0.4 ~ 0.8mm, can HRA ruler, when hardened layer thickness of more than 0.8mm, can HRC ruler. Vickers, Rockwell and Rockwell superficial hardness of three valuescan easily be converted to each other, into a standard, drawings or hardness user needs.