Method for rapidly measuring internal stress of nickel-based single crystal superalloy

A technology of nickel-based single crystal and high-temperature alloy, which is applied in the direction of measuring force, measuring devices, instruments, etc., can solve the problems of difficult sample measurement and low degree of automation, achieve fast counting and collection, and improve work efficiency.

CN110044527AActive Publication Date: 2019-07-23成都航大新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-07-23

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Abstract

The invention discloses a method for rapidly measuring the internal stress of a nickel-based single crystal superalloy, and belongs to the technical field of material performance testing. The method comprises the following steps: firstly, selecting a crystal face family, rotating a sample to be tested, and recording all diffraction positions of the crystal face family and the Miller index of the corresponding crystal face; performing theta-2 theta scanning on the periphery of each diffraction position on the polar diagram, recording the position corresponding to the strongest peak of the diffraction intensity of each diffraction position and calibrating the Miller index of the corresponding crystal face and the corresponding theta-2 theta diffraction peak; obtaining the crystal face spacing at the moment by applying Bragg law; and processing data to obtain the magnitude and direction of the internal stress of the nickel-based single crystal superalloy. The method for rapidly measuringthe internal stress of the nickel-based single crystal superalloy is suitable for samples with any orientation, and realizes the integration of crystal orientation measurement and stress measurement of the monocrystal; and the automated operation process and the programmed data processing process improve the work efficiency.
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Description

technical field

[0001] The invention belongs to the technical field of material performance testing, and relates to an X-ray-based method and device for rapidly measuring the internal stress of a nickel-based single crystal superalloy, which can realize rapid and automatic detection of complex samples. Background technique

[0002] As the material used for aeroengine turbine blades, the residual stress of nickel-based single crystal superalloys has been concerned. The existence of residual stress will affect the performance of the material itself, such as reducing fatigue life and recrystallization, so it is very important to quantitatively analyze the internal stress of nickel-based single crystal superalloy tubes. At this stage, most of the equipment used in the stress measurement of nickel-based single crystal superalloys is biased towards experimental research. Although the precision is high, the degree of automation is low, and it is difficult to measure samples with co...

Examples

Embodiment

[0055] Determination of surface stress after heat treatment of tetragonal nickel-based single crystal superalloy:

[0056] Take a nickel-based single crystal superalloy sample of a certain brand, such as figure 2 , the shape of the sample is a square, the size is 10mm×10mm×7mm, and the test surface is electrolytically polished. Then clamp it with the pneumatic gripper 2 so that the point to be measured is located at the SCP point.

[0057] The orientation of the test surface of the sample was determined, and the orientation was 6° away from the [110] orientation. Referring to the standard pole figure of [110], the {331} and {400} crystal plane families are selected as the determination crystal plane family. According to the standard diffraction card, the diffraction angle of the {331} crystal plane family is 139.540°, and {400} The diffraction angle of the crystal plane group is 119.200°.

[0058] The input parameter 2θ angle is 139.540°, 119.200°, the range of the input s...