Creating a Surface Layer of High Performance Wave Strain Hardening

Study of Methods Relating to Increase of Contact Pitting Resistance in 45, 40H, 35HGSA Steel due to Development of Heterogeneous Structure Involving Mechanical Hardening Technique

“…To solve this problem, we propose to use a new method of SPD -static-pulse treatment that can create hardened surface layer with: depth of 6 ... 8 mm or more, hardness, up to 6500 MPa, compressive stresses up to 800 MPa [1][2][3][4][5][6]. The feature of static-pulse treatment technology is loading of hardened material by controlled deformation shock waves, the shape of which is adapted to material properties and it permits to increase the quantity of impact pulses energy, transferred to the material.…”

“…However, experiments proved that not every non-uniformly hardened homogeneous layer can result in reduction of the durability [1][2][3][4][5][6]. Specific sizes and alternation of solid and viscous-plastic areas allow you creating heterogeneous structure in the surface layer that improves durability.…”

Development of Parameters Describing Heterogeneous Hardened Structure

“…According to the last researches, to increase the contact endurance of the components, together with such characteristics hardened surface layer as depth and hardening degree (in regard to increase of hardness), uniformity of hardening plays important role, i.e. alternation of areas of different hardening along and by depth of the hardened layer [1,2].…”

“…By variation of SIT modes the hardened structures with different uniformity that differ by sizes and hardening degree of hard and soft areas and mode of their alternation, were obtained. Their research has shown that in specific circumstances of hard and soft areas formation the contact pitting can be decreased by factor of 3...6 [2].…”