A wet shot peening surface modification treatment method suitable for nickel-based superalloys

Abstract

The invention relates to a wet shot peening surface modification treatment method suitable for a nickel-based high-temperature alloy. The method comprises the following treatment methods of pre-treatment before shot peening, wherein the surface cleaning is carried out on nickel-based high-temperature alloy parts, no pollutants exist on the surface of the parts, and the parts which cannot be shot-peened are wrapped and plugged; wet shot peening treatment, wherein the wet shot peening treatment is carried out on the nickel-based high-temperature alloy parts by using ceramic shots and water, andthe water to ceramic shots is 4:1 by mass ratio; and post-treatment of shot peening, the nickel-based high-temperature alloy parts after conducting wet shot peening are dried at room temperature to finish surface modification treatment. According to the wet shot peening surface modification treatment method, the structure of materials is adjusted and controlled through the optimization of technological parameters, thus improving the universality of the method, and by utilizing the lubricating and buffering effects of water, the strain rate of plastic deformation during the process of shot peening can be reduced, the surface defects such as microcracks and peeling on the surface of the nickel-based high-temperature alloy are avoided, thus enhancing the surface integrity level of the materials and perfecting the fatigue performance of the materials.

Description

technical field [0001] The invention relates to the technical field of shot peening surface modification treatment, in particular to a wet shot peening surface modification treatment method suitable for nickel-based superalloys. Background technique [0002] Superalloys have good high-temperature mechanical properties, hot corrosion resistance, fracture toughness and high-temperature oxidation resistance, and are widely used in the aerospace field. In aero-engines, superalloys can be used to prepare high-temperature hot-end components, such as: turbine blades, turbine disks, guides and combustion chambers of aero-engines. [0003] Due to the influence of alternating load and external environment, fatigue fracture has become the main failure mode of most nickel-based superalloy components in engineering applications. According to statistics, 80% of the failure of parts is caused by fatigue fracture, which seriously limits the nickel-based superalloy components. Application a...

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Problems solved by technology

However, due to the special performance of nickel-based superalloy materials, there are mainly the following disadvantages after traditional dry shot peening: (1) The strain rate of nickel-based superalloys is relatively large in the process of traditional dry shot peening, and it is easy to make nickel-based superalloys Surface defects such as micro-cracks and peeling are likely to form fatigue sources and reduce its surface integrity; (2) The surface roughness of the sample after dry shot peening is relatively large, because the dry shot peening has no water buffer and the kinetic energy of the projectile is large. It is easy to cause surface stress concentration and reduce fatigue performance

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