METHOD OF FORMING RESIDUAL STRESSES DURING IMPACT AND LASER IMPACT-WAVE TREATMENT Russian patent published in 2024 - IPC B23K26/34 B23K26/352 C21D10/00 C21D11/00 C21D1/42 

FIELD: performing operations.

SUBSTANCE: invention relates to laser shock-wave hardening of steel parts surface, in particular to methods of creating required profile of residual stresses in surface hardening zone. Layer-by-layer impact hardening is used to create a depth-variable gradient distribution and the required concentration of compressive stresses in the surface layer of the part. Thickness of the obtained hardened layer is measured. Local heating of material is performed in zone of tensile stresses occurring during shock-wave treatment under hardened layer. Said local heating is created by means of a solenoid moved along the surface of the part with controlled electromagnetic pulses depending on the thickness of the hardened layer, which is measured at the heating point. Heating is created by means of a U-shaped solenoid, which is located above the surface of the processed part on the side of the opposite hardened surface.

EFFECT: quality of the treated surface is improved by reducing the concentration and overall level of tensile stresses and dislocations that arise in the metal during the hardening process.

3 cl, 2 dwg