Detection method of hot shear cutter material laser shock residual stress thermal relaxation

Abstract

The invention provides a detection method of hot shear cutter material laser shock residual stress thermal relaxation. The detection method comprises following steps: a hot shear cutter material is cut into cuboid small pieces, and the length, width, and height of the cuboid small pieces are measured; a geometric model is constructed in simulation software ANSYS / LS_DYNA, and a finite element model is obtained via unit selection, mapped meshing, constitutive model selection, and boundary condition application; laser parameters are set, simulation of laser shock on the finite element model is carried out in a S-shaped light spot impact trajectory; surface residual stress and depth residual stress of the finite element model are measured after impact; at a same thermal holding time, temperature load of the finite element model is changed, and surface residual stress and depth residual stress of the finite element model are measured, so that residual stress thermal relaxation under different temperature load is obtained. Operation of the detection method is simple and convenient; detection efficiency is high; cost is low; the detection method is friendly to the environment; no pollution is caused; and optimum parameters can be provided for subsequent hot shear cutter impact modification.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, material processing and processing detection and analysis, and in particular relates to a detection method for thermal relaxation of thermal shear tool material laser shock residual stress. Background technique [0002] In advanced manufacturing technology, laser shock processing technology, as a typical representative of high-energy beam, is a processing method with good prospects. Its principle is to use high-power short-pulse laser to interact with the surface of materials to modify the surface of materials. especially fatigue life. This technology has been widely used in various industries such as mechanical engineering, shipbuilding, aviation, and microelectronics. At present, this technology is mainly used in material modification, metal impact strengthening and forming, and non-destructive testing. [0003] The finite element analysis software ANSYS / LS_DYNA, as a display ...

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Problems solved by technology

The scissor blade in hot shear is to cut and cut the steel material of the primary rolling steel plant at about 800-1000 ℃. In addition to requiring strong impact toughness and high temperature strength, the surface of the cutting edge of the tool also needs to be very strong. Strong hardness, strong wear resistance, thermal stability, and thermal fatigue resistance; residual stress will be generated during the working process, but the existence of thermal relaxation of residual stress will not only reduce the rigidity and stability of the structure but also reduce the stiffness and stability of the structure under temperature and Under the combined action of the medium, it will also seriously affect the fatigue strength of the structure, the ability to resist brittle fracture, the ability to resist stress corrosion cracking and high temperature creep cracking

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