A Calculation Method of X-ray Residual Stress of α+β Type Titanium Alloy

A technology of residual stress and titanium alloy, applied in force/torque/work measuring instruments, measuring force, measuring devices, etc., can solve problems such as inability to obtain true and reliable residual stress measurement results

Active Publication Date: 2021-09-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In TC series titanium alloys, α-phase and β-phase co-exist, and the proportion of these two phases is close, and the influence of the two-phase coexistence cannot be ignored in the residual stress detection, which makes the conventional X-ray residual stress detection method and operation process impossible. Get true and reliable residual stress measurements

Method used

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  • A Calculation Method of X-ray Residual Stress of α+β Type Titanium Alloy
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  • A Calculation Method of X-ray Residual Stress of α+β Type Titanium Alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The TC17 titanium alloy blisk component used in an aero-engine has a nominal composition of Ti-5Al-2Sn-2Zr-4Mo-4Cr, and it is required to detect and evaluate the surface residual stress after machining.

[0057] In order to detect the residual stress at a measurement point of the TC17 titanium alloy blisk component, after the machining is completed, the following steps are carried out:

[0058] (1) Prepare a metallographic sample, the material taken is the same batch of blanks as the TC17 titanium alloy blisk component to be tested, and the size of the metallographic sample is 5mm×5mm×3mm;

[0059] (2) Embedding, grinding and vibrating polishing of metallographic samples;

[0060] (3) Scanning electron microscope-electron backscattering pattern technique (SEM-EBSD) is used to obtain the volume fraction of α phase in the metallographic sample: 27% and the volume fraction of β phase: 73%, 27%+73%=100 %,fulfil requirements;

[0061] (4) Place the TC17 titanium alloy blis...

Embodiment 2

[0073] A TC11 titanium alloy blade component used in an aero-engine has a nominal material composition of Ti-6.5Al-1.5Zr-3.5Mo-0.3Si. It is required to detect and evaluate the surface residual stress after the shot peening process is completed.

[0074] In order to detect the residual stress at a measurement point of the TC11 titanium alloy blade component, after the machining is completed, the following steps are carried out:

[0075] (1) Prepare a metallographic sample, the material taken is the same batch of blanks as the TC11 titanium alloy blade component to be tested, and the size of the metallographic sample is 5mm×5mm×3mm;

[0076] (2) Embedding, grinding and vibrating polishing of metallographic samples;

[0077] (3) Adopt scanning electron microscope-electron backscatter pattern technique (SEM-EBSD) to determine the volume fraction of α phase in the metallographic sample respectively: 68% and the volume fraction of β phase: 32%, 68%+32%=100 %,fulfil requirements;

...

Embodiment 3

[0090] A TC4 titanium alloy blade component used in an aero-engine has a nominal material composition of Ti-6Al-4V, and it is required to detect and evaluate the surface residual stress after the shot peening process is completed.

[0091] In order to detect the residual stress at a measurement point of the TC4 titanium alloy blade component, after the machining is completed, the following steps are carried out:

[0092] (1) Prepare a metallographic sample, the material taken is the same batch of blanks as the TC4 titanium alloy blade component to be tested, and the size of the metallographic sample is 5mm×5mm×3mm;

[0093] (2) Embedding, grinding and vibrating polishing of metallographic samples;

[0094] (3) Use scanning electron microscope-electron backscatter pattern technique (SEM-EBSD) to determine the volume fraction of α phase in the metallographic sample respectively: 40% and the volume fraction of β phase: 60%, 40%+60%=100 %,fulfil requirements;

[0095] (4) Place ...

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Abstract

The invention discloses an X-ray residual stress measurement method for an α+β type titanium alloy, which includes determining the volume fraction α% of the α phase and the β phase in the α+β type titanium alloy by using scanning electron microscope-electron backscattering pattern technology The volume fraction β% of the α+β type titanium alloy component is measured by using multi-target multi-parameter X-ray diffraction sin 2 The ψ method is used to measure the residual stress and residual stress error of α-phase and β-phase and calculate the residual stress value at the measurement point of α+β-type titanium alloy components through the formula σ m ±Δσ m . The present invention improves the accuracy of residual stress measurement in α+β-type titanium alloy components through a whole set of systematic measurement methods, and can realize the scientific measurement of residual stress in α+β-type titanium alloy components, which is α+β-type titanium Alloy component design calculation and fatigue life analysis provide reliable data.

Description

technical field [0001] The invention relates to the field of residual stress detection, in particular to an X-ray residual stress measurement method for an α+β type titanium alloy. Background technique [0002] X-ray diffraction sin 2 The ψ method is a widely used non-destructive test method for residual stress. Its basic principle is: when there is residual stress in the sample, the corresponding interplanar spacing will change, and when X-ray Bragg diffraction occurs, the resulting diffraction peak will also Will move accordingly, and the size of the moving distance is related to the stress. When X-ray diffraction occurs between lattices, according to the Bragg equation and the generalized Hooke's law, the stress calculation equation can be obtained: [0003] σ = KM (1) [0004] [0005] [0006] In the formula: K is the X-ray stress constant, the unit is ψ is the azimuth angle, which is the angle between the normal of the diffraction crystal plane and the norma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2055G01N23/2005G01N23/203G01N23/2202G01N23/2251G01L5/00G01L1/25
CPCG01L1/25G01L5/0047G01N23/2005G01N23/203G01N23/2055G01N23/2202G01N23/2251G01N2223/0566G01N2223/1016G01N2223/102G01N2223/63
Inventor 崔敏超姚倡锋谭靓张定华张吉银孙蕴齐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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