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High-energy composite repair method for shallow cracks of titanium alloy

A composite repair and titanium alloy technology, applied in the field of surface repair, can solve problems such as the adverse effect of alloy fatigue properties, and achieve the effect of improving fatigue resistance and fatigue strength.

Active Publication Date: 2014-08-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The repair methods of spraying and high-energy beam alone can repair cracks by melting fillers or matrix, but these methods have adverse effects on alloy fatigue properties, and are not suitable for titanium alloy parts serving under alternating loads

Method used

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  • High-energy composite repair method for shallow cracks of titanium alloy
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Embodiment Construction

[0008] Using shot peening and high-energy pulsed electron beam modification treatment to repair and repair the shallow cracks of titanium alloy parts, it is used to improve the surface performance of the material and ensure the reliability of the parts. This technology has the following technical characteristics.

[0009] (1) Number of pulses: 5 to 30 times;

[0010] (2) The duration of a single pulse: 50μs~200μs;

[0011] (3) Pulse energy: 10J / cm 2 ~30J / cm 2 ;

[0012] (4) Nano structure depth: 0μm~15μm;

[0013] (5) Nano structure size: less than 100nm;

[0014] (6) Shot peening strength: 0.05A~0.25A;

[0015] (7) Shot peening surface coverage: 100%~300%;

[0016] (8) Usable shots: ceramic shots, cast steel shots and glass shots.

[0017] Specific steps are as follows:

[0018] 1. Use pulsed electron beam equipment to process titanium alloy materials.

[0019] 1 boot

[0020] Start the device and load high voltage.

[0021] 2 artifacts

[0022] 2.1 Processing inspection: Check the surface qua...

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Abstract

The invention belongs to the surface repair technology, and relates to a high-energy composite repair method for the shallow cracks of titanium alloy, which is used for repairing the shallow cracks and increasing the fatigue lives of titanium alloy components. Composite repair is performed on the surfaces of the titanium alloy components with small cracks on near surfaces due to serving damages by means of coordinating shot-blasting aftertreatment with high-energy pulse electron beam modification, the surface cracks having depths of less than 20 mu m of titanium alloy can be repaired, and surface residual compressive stress layers having depths of greater than 50 mu m and pressure values of greater than 300 MPa are generated on the surfaces of titanium alloy, thus increasing the fatigue strength. The technology is high in working efficiency, high in process control accuracy, environment-friendly and pollution-free, economical and reliable, and suitable for promotion.

Description

Technical field [0001] The invention belongs to surface repair technology, and relates to a high-energy composite repair method for titanium alloy shallow cracks, which repairs shallow cracks and improves the fatigue life of titanium alloy parts. Background technique [0002] Titanium alloy parts may produce micro-cracks near the surface during service in the environment (impact of micro-particles), and the existence of micro-cracks will reduce the fatigue performance of actual parts. The usual method is regular maintenance. Shot peening technology is used in the maintenance process. Due to the lack of energy of shot peening, greater strength is required to close some shallow cracks. It is difficult to control the process and the parts continue to be in service. In, closed cracks are also easy to crack, affecting the reliability of parts. [0003] The shallow cracks of the previous alloy parts are mostly repaired by spraying or a separate high-energy beam method. Spraying and sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/02C22F1/18
Inventor 王欣汤智慧宋颖刚王强田帅
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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