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Standard sample preparation method of residual stress deflection method calibration device

A technology for calibrating devices and residual stress, which is applied in the preparation of test samples, measuring devices, sampling, etc., and can solve problems such as deflection methods

Active Publication Date: 2020-08-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the research on residual stress calibration samples is mainly aimed at ultrasonic method and X-ray method, and there is no research on deflection method.

Method used

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  • Standard sample preparation method of residual stress deflection method calibration device
  • Standard sample preparation method of residual stress deflection method calibration device
  • Standard sample preparation method of residual stress deflection method calibration device

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preparation example Construction

[0024] The invention provides a method for preparing a standard sample of a residual stress deflection method calibration device, comprising the following steps:

[0025] (1) Using raw material powders consistent with the composition of the product to be tested, mixing the raw material powders in a vacuum, and then sequentially performing pressing and sintering treatments to obtain a blank block;

[0026] (2) machining the blank block to obtain a constant beam blank of a certain size;

[0027] (3) Electrolyzing the equal-strength beam blank to obtain an equal-strength beam sample;

[0028] (4) heat-treat the equal-strength beam sample and then cool it down, and repeat the steps of heat-treatment and cooling to obtain a standard sample for the calibration device of the residual stress-deflection method.

[0029] The invention adopts the raw material powder with the same composition as the product to be tested, mixes the raw material powder in a vacuum, and then carries out pre...

Embodiment 1

[0039] TC4 titanium alloy

[0040] In terms of mass percentage, 90% titanium oxide powder, 6% vanadium aluminum powder, and 4% aluminum powder are vacuum dry mixed in a vacuum furnace filled with protective argon gas at a vacuum degree of 0.01Pa, and mixed evenly to obtain a mixture. The particle size of the mixed material is 200 μm; the mixed material is subjected to vacuum compression molding at a molding pressure of 300 MPa, and vacuum sintered at a temperature of 1200 ° C for 4 hours, and then cooled with the furnace temperature to obtain a TC4 alloy sintered body.

[0041] The obtained sintered body is machined, and an electrolytic machining allowance of 0.8mm is reserved on each side, and the length L is obtained after electrolytic machining. 0 =185mm, thickness H=4mm, maximum width B≤38mm TC4 alloy and other strong beam samples, in which the electrolyte is NaNO with a mass concentration of 15% 3 Aqueous solution, power-on time 60s, voltage 20V, electrode feed speed 0.9...

Embodiment 2

[0045] GH4169 superalloy

[0046] The alloy powder was prepared by using the GH4169 master alloy, and the alloy powder whose size was mainly concentrated in 100-300 μm and the average particle size was 190 μm was obtained. In a vacuum furnace with a vacuum degree of 0.01Pa and filled with protective argon gas, the alloy powder is vacuum pressed and molded, the molding pressure is 350MPa, and vacuum sintered at a temperature of 1000°C for 4 hours, and then cooled with the furnace temperature to obtain a GH4169 alloy sintered body .

[0047] The obtained sintered body is machined, and an electrolytic machining allowance of 0.8mm is reserved on each side, and the length L is obtained after electrolytic machining. 0 = 185mm, thickness H = 4mm, maximum width B ≤ 38mm powder GH4169 alloy and other strong beam samples, in which the electrolyte is NaCl aqueous solution with a mass concentration of 12%, the electrification time is 70s, the voltage is 18V, and the electrode feed speed ...

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Abstract

The invention relates to the technical field of material analysis and testing, and provides a standard sample preparation method of a residual stress deflection method calibration device. Raw materialpowder is pressed and then sintered; fine grain structures can be obtained, the internal stress generated by uneven deformation between large crystalline grains is reduced, then residual tiny allowance is removed through electrolysis, introduction of large additional stress can be avoided, proper annealing treatment is conducted on the electrolyzed sample, the internal stress of the sample can befurther reduced, and finally the high-precision standard sample of the residual stress deflection method calibration device is obtained. The standard sample prepared by the method is relatively smallin residual stress, and the residual stress is almost zero.

Description

technical field [0001] The invention relates to the technical field of material analysis and testing, in particular to a method for preparing a standard sample of a residual stress deflection method calibration device. Background technique [0002] Various mechanical processes such as casting, cutting, welding, heat treatment, assembly, etc. will cause different degrees of residual stress in the workpiece. The existence of residual stress, on the one hand, will reduce the strength of the workpiece, causing process defects such as deformation and cracking of the workpiece during manufacturing; on the other hand, it will change the size of the workpiece or make its fatigue strength, Reduced mechanical properties such as stress corrosion. Therefore, in order to ensure the safety and reliability of the workpiece, it is necessary to accurately measure the residual stress of the workpiece. [0003] The test methods of residual stress can be divided into non-destructive method, m...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/42G01N1/44B22F5/00B22F3/16
CPCB22F3/162B22F5/00B22F2003/245B22F2003/248G01N1/286G01N1/42G01N1/44
Inventor 杨艳慧刘东王建国
Owner NORTHWESTERN POLYTECHNICAL UNIV
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