Laser shock gray cast iron component surface micro-texturing method

Abstract

The invention provides a laser shock gray cast iron component surface micro-texturing method. The method is characterized in that a pulse laser is utilized to emit a laser beam, the laser beam is converted into a longitudinal light path through a reflecting mirror, and the longitudinal light path passes through a focusing lens, penetrates through constraint layer water, acts on an energy absorption layer aluminum foil and absorbs laser energy to rapidly generates plasma gasification to form a plasma cluster; and the plasma cluster is exploded to generate shock waves under the action of a constraint layer, the shock waves are transmitted to the interior of a gray cast iron material, pressure of the shock waves is far greater than dynamic yield strength of the gray cast iron, flake graphiteis dispersed and evolves into a spherical group shape, ferrite grains are refined and cut into smaller sub-grains, the surface of the gray cast iron generates plastic deformation and dislocation slipto form pits to relieve abrasive wear and adhesive wear, the wear surface is mainly Fe3O4, Fe2O3 and more cementite at high temperature, a discontinuous oxide film with a larger area is formed, directcontact of a friction pair is avoided, and wear resistance of the material is improved.

Description

technical field [0001] The invention relates to a method for laser shocking the surface micro-modeling of gray cast iron components, belonging to the technical field of laser processing. Background technique [0002] Gray cast iron is an important metal material in the modern manufacturing industry. It is widely used in friction pair components such as guide rails and brake discs because of its good self-lubricating properties, vibration damping and low-cost characteristics, but it will gradually wear out during use. , the main wear failure modes are adhesive wear and abrasive wear, and the high temperature wear surface is mainly iron oxide Fe 3 o 4 , Fe 2 o 3 , FeO and cementite, the friction surface changes from oxidative wear to adhesive wear, and then the wear is severe. [0003] To improve the wear performance of gray cast iron components, the optimization design of smelting process, material composition and other composite coating technologies such as thermal spray...

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Problems solved by technology

[0003] The improvement of wear performance of gray cast iron components mainly adopts optimized design of smelting process, material composition and other composite coating technologies such as thermal spraying and laser cladding. For example, the invention patent with application number 201721662689. Automobile brake discs, by coating the surface of gray cast iron to improve the wear resistance and high temperature resistance of the brake disc, the cost is high and the production process is complicated

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