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Method for strengthening vibration fatigue performance of metal material by laser peening and ultralow temperature coupling

A technology of metal material and laser peening, which is applied in the field of metal material processing, can solve the problems such as the selection of process parameters, and achieve the effects of improving anti-vibration fatigue performance, improving stability, improving metal damping capacity and fracture strength and toughness

Pending Publication Date: 2021-06-01
CHANGZHOU UNIV
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Problems solved by technology

At present, the existing technology can only be explored based on repeated experiments, and there is no feasible judgment basis for the selection of process parameters

Method used

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  • Method for strengthening vibration fatigue performance of metal material by laser peening and ultralow temperature coupling
  • Method for strengthening vibration fatigue performance of metal material by laser peening and ultralow temperature coupling

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Embodiment 1

[0025] A method of coupling laser peening and ultra-low temperature to strengthen the vibration fatigue performance of metal materials, see figure 1 , including the following steps:

[0026] (1) Sample preparation:

[0027] Grind and polish the surface of the TC4 titanium alloy, then use an ultrasonic cleaner to clean the sample in an industrial alcohol solution for 20 minutes, and finally take it out and dry it with a hair dryer;

[0028] (2) Obtain the optimal process parameters for ultra-low temperature treatment:

[0029] Using liquid nitrogen as the refrigerant, the TC4 titanium alloy is subjected to ultra-low temperature treatment under the parameters of ultra-low temperature of -50--196 °C, ultra-low temperature treatment retention time of 0.5-10 h, and cooling rate of 10-50 °C / min; The maximum residual compressive stress value and microhardness on the surface of the titanium alloy sample are the optimization goals, and the optimal ultra-low temperature treatment proc...

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Abstract

The invention discloses a method for strengthening vibration fatigue performance of a metal material by laser peening and ultralow temperature coupling, and relates to the technical field of laser machining and surface strengthening of the metal material. The method mainly comprises the following steps of (1) preparing a sample; (2) acquiring optimal technological parameters of ultralow-temperature treatment; (3) obtaining the dynamic yield strength of the metal material at the ultralow temperature; (4) solving the hugoniot elastic limit of the metal material at the ultralow temperature; (5) solving the laser power density; (6) acquiring laser energy parameters; and (7) carrying out laser peening strengthening treatment at the ultralow temperature. According to the method, the dynamic recovery and annihilation inhibition effects of the ultralow temperature are utilized, so that the dislocation density is improved; by adopting the coupling effect of the ultralow temperature and the ultrahigh strain rate, the dislocation slippage is inhibited, and the nanometer deformation twin crystal nucleation driving force is improved; and the damping capacity and fracture toughness of the metal material are improved by utilizing the interaction between dislocation and nanometer deformation twin crystals, so that the vibration fatigue resistance is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for strengthening the vibration fatigue performance of metal materials by coupling laser peening and ultra-low temperature. Background technique [0002] As one of the most important components of an aero-engine, blades are prone to fatigue damage under complex and changeable service conditions. When the engine is running, they are constantly subjected to periodic airflow excitation forces to generate vibrations. Under the vibration load caused by high centrifugal force and aerodynamic force, it is easy to cause fatigue failure or even fracture. According to incomplete statistics, the fatigue failure caused by vibration accounts for about 60% of aero-engine failures, and the vibration fatigue damage of blades accounts for 70% of the total vibration failures. Fatigue damage caused by vibration fatigue is one of the main failure modes of blades. Therefo...

Claims

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Application Information

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IPC IPC(8): C21D10/00C21D6/04C22F3/00C22F1/00
CPCC21D10/005C21D6/04C22F3/00C22F1/00
Inventor 李京刘麟张颖刘文明刘雪东张智宏彭剑
Owner CHANGZHOU UNIV
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