Metal surface laser strengthening and toughening method and device

Abstract

The embodiment of the invention discloses a metal surface laser strengthening and toughening method and device. The method comprises the following steps of: performing heat melting on the surface of atarget metal component by laser, and obtaining the temperature of a melting layer; when the temperature of the melting layer drops within a semi-solid state region formed by a primary phase, performing mechanical disturbance on a semi-solid-state melting layer by laser through short pulses; and cooling the melting layer which is subjected to mechanical disturbance until a dual-scale composite structure is formed on the surface of the target metal component. The metal surface laser strengthening and toughening method is a surface strengthening and toughening method based on laser semi-solid-state processing, is substantially a free-melting and dynamic re-crystallizing process of a metal part surface layer, can eliminate internal defects such as pores of a metal part thin-wall region and thermal stress, improves internal quality and mechanical comprehensive properties of the metal thin-wall part, and effectively controls the macroscopical deformation and cracking problem.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a laser toughening method and device for metal surfaces. Background technique [0002] As we all know, fatigue, corrosion and wear are the three main failure modes of mechanical parts and engineering components, and most of these fracture failure modes start from the surface of the component or result from the loss of material on the surface of the component. Therefore, the use of surface protection or surface strengthening technology to delay and control the failure and damage of the material surface has become an effective method to solve the above problems. [0003] At present, the surface strengthening treatment methods of metal materials mainly include traditional surface quenching technology, thermal infiltration technology, thermal spraying technology, surfacing technology, electroplating hard chrome technology, vapor deposition technology, high energy beam heat t...

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Problems solved by technology

[0006] The embodiment of the present invention provides a method and device for strengthening and toughening metal surfaces by laser, which overcomes the traditional laser thermal effect or mechanical effect. problems, while improving the comprehensive mechanical properties of metal parts

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