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A method for simulating ultra-high cycle fatigue damage of superalloys

A superalloy, fatigue damage technology, used in the field of measurement and testing

Active Publication Date: 2016-08-17
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the evaluation method for fatigue damage is only applicable to conventional fatigue with a cycle number below 106, but for ultra-high cycle fatigue damage characteristics such as cracks originating from subsurface and crystal deformation at small angle subgrain boundaries, there is no such method at home and abroad. Test method for simulation evaluation of damage characteristics

Method used

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  • A method for simulating ultra-high cycle fatigue damage of superalloys
  • A method for simulating ultra-high cycle fatigue damage of superalloys
  • A method for simulating ultra-high cycle fatigue damage of superalloys

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Experimental program
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Embodiment 1

[0024] The test material is directionally solidified superalloy DZ125, which is a cast superalloy, and heat treatment is carried out according to the conventional heat treatment system 1180°C / 2h+1230°C / 3h air cooling+1100°C / 4h air cooling+870°C / 20h. The steps of this method are as follows:

[0025] step one,

[0026] Ultrasonic fatigue test system was used to test the ultra-high cycle fatigue performance of materials. For ultrasonic fatigue, funnel-shaped specimens are usually selected, such as figure 1 shown. Firstly, the resonant frequency f of the specimen can be measured by using the ultrasonic fatigue test system, and then through the formula E d = 4l 2 f 2 ρ, density of known material ρ=8.48g / cm 3 , Specimen length ι = 50mm and resonant frequency f = 20kHz, the dynamic modulus of elasticity of the material can be obtained. The size of each stage of the sample is designed through the theory of solid vibration and the dynamic modulus of elasticity. The test frequen...

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Abstract

Belonging to the technical field of measuring and testing, the invention relates to ultra-high cycle fatigue of an ultrasonic fatigue test simulation material, and a high temperature alloy ultra-high cycle fatigue damage simulation method adopting a microanalysis technique for studying micromechanical properties and material deformation to conduct damage assessment. In the invention, a neutron diffraction method is employed to test high temperature alloy funnel-shaped sample surface and subsurface residual stress absolute difference, thus obtaining a relation curve of a cycle number and the residual stress absolute difference; utilizing a nanoindentor to test the elastic modulus absolute difference between dendrite arms and dendrites in the material, thus obtaining a relation curve of the cycle number and the elastic modulus absolute difference; and analyzing the crystal deformation condition by electron back scattering diffraction so as to obtain a relation curve of the cycle number and small angle subboundary crystal deformation. Through comprehensive comparison of the three curves, the dominant factors determining high temperature alloy ultra-high cycle fatigue damage can be understood clearly, and the ultra-high cycle fatigue damage condition of similar other alloys can be predicted.

Description

technical field [0001] The invention belongs to the technical field of measurement and testing, and relates to a method for simulating ultra-high-cycle fatigue damage of high-temperature alloys by means of an ultrasonic fatigue test simulating ultra-high-cycle fatigue of materials, and using a micro-analysis method for studying microscopic mechanical properties and material deformation for damage assessment. Background technique [0002] The engine structural integrity program has changed the high cycle fatigue life requirements of aeroengine components from 10 7 Cycles increased to 10 9 cycle. Therefore, it is very important to study the fatigue damage of aeroengine components, especially the turbine blades in the ultra-high cycle fatigue stage. At present, the traditional fatigue test is used to simulate the ultra-high cycle fatigue of materials, and the test frequency is about 100 Hz. 20kHz can save a lot of time, and it is close to the frequency of high-speed operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/20
Inventor 顾玉丽陶春虎曲士昱
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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