Control of mechanical properties

- Metal testing is necessary to establish strength, which is especially important for its further use.

- Tensile tests are carried out on specialized machines, where the samples are placed in special tensile machines, where they are stretched to failure, that is, rupture. At the moment of testing, the speed does not change, while the values ​​of ultimate resistance, yield strength, relative elongation, relative contraction are determined.

- Impact testing of materials is based on the destruction of a standard sample with a U or V - shaped concentrator (notch) in the middle by impact on a pendulum impact device, both at positive and negative temperatures. Impact testing evaluates the performance of a metal under difficult loading conditions and reveals its tendency to brittle fracture. With a decrease in temperature, the impact strength decreases, therefore, along with tests at normal temperatures, impact tests with pre-cooling to temperatures from -400C to -700C are used. Cold chambers are used to cool the metal, the source of low temperature in which is liquid nitrogen or alcohol.

- Brinell hardness control HB

The essence of the method consists in pressing a ball (steel or hard alloy) into a sample (product) under the action of a force applied perpendicular to the sample surface for a certain time, and measuring the diameter of the indentation after removing the force.