A Study on the Relationship between Hardness and Magnetic Properties of Ultra-High Strength Steel

Magnetic nondestructive testing methods including eddy current testing, magnetic memory, magnetic Barkhausen noise and so on are widely used in testing mechanical properties of ferromagnetic parts. Experiments were done to study the relationship between hardness and magnetic properties of ultra-high strength steel (UHSS), which plays an important role in automobile industry. The magnetic properties of UHSS specimens with different hardness were studied. The result shows that there is a strong connection between hardness and magnetic properties. Coercive force of UHSS is proportional to the hardness. This can be used to explain certain mechanism of magnetic nondestructive testing method such as connection between hardness and Barkhausen noise.

Application and metrological support of magnetic particle method of nondestructive testing in air transport

Magnetic nondestructive testing is used to assess the technical condition of power parts of aircraft made of ferromagnetic materials. At the same time in the organizations of air transport in the process of maintenance and repair of aircraft to control the integrity of steel power parts is widely used such a variety as magnetic particle control.