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Grain Size Affects the Correction Method of Ultrasonic Evaluation of Material Stress

A technology of grain size and material stress, which is applied in the direction of material analysis, material analysis, and detection response signal processing using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as difficulty in accurately measuring ultrasonic propagation speeds

Active Publication Date: 2018-10-12
中兴海陆工程有限公司
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Problems solved by technology

However, relevant studies have shown that the ultrasonic propagation velocity is not sensitive to stress changes. The 100MPa stress makes the variable of ultrasonic propagation velocity in aluminum 0.1%. Therefore, the accurate measurement of ultrasonic propagation velocity is extremely important for the accuracy of ultrasonic evaluation stress results. Accurate measurement of velocity is very difficult

Method used

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  • Grain Size Affects the Correction Method of Ultrasonic Evaluation of Material Stress
  • Grain Size Affects the Correction Method of Ultrasonic Evaluation of Material Stress
  • Grain Size Affects the Correction Method of Ultrasonic Evaluation of Material Stress

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Embodiment 1

[0030] Select Q235 steel as an example to describe the correction method of grain size affecting ultrasonic evaluation of material stress. The specific process is as follows:

[0031] 1. Select Q235 steel as the evaluation object, combine the Fe-C binary alloy phase diagram to formulate the heat treatment process curve, and obtain six groups of Q235 steel samples with different grain sizes, which are respectively marked as S1-S6 ( figure 1 shown). The heat treatment process and the grain size of each sample are shown in Table 1.

[0032] Table 1 Heat treatment process parameters and grain size of Q235 steel

[0033]

[0034] Step 2: Optimizing the excitation parameters of the ultrasonic signal, collecting the ultrasonic signals of the S1-S6 samples sequentially at intervals of 20mm, extracting the amplitude of the ultrasonic receiving signal at each propagation distance, and establishing the corresponding relationship between the amplitude of the ultrasonic receiving signa...

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Abstract

The invention discloses a method for correcting the influence of grain size on ultrasonic evaluation of material stress, and belongs to the technical field of ultrasonic non-destructive evaluation. This method is based on the analysis of the energy attenuation of ultrasonic waves in the sample, prepares dual ultrasonic probes with constant propagation distances, and uses heat treatment to obtain samples with different grain sizes, and calculates and establishes samples of each grain size through ultrasonic acoustic elastic coefficient calibration experiments. The relationship between the time difference between ultrasonic signals and the stress, using the linear fitting function to obtain the ultrasonic acoustoelastic coefficient of each grain size sample, and obtaining the function between the ultrasonic acoustoelastic coefficient and the grain size through power function fitting, and then realizing the influence of grain size Correction for ultrasonic evaluation of material stress. The invention provides a non-destructive method for the evaluation of material stress influenced by grain size, and has the advantages of fast, convenient, safe, online evaluation and the like.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic non-destructive evaluation, and in particular relates to a method for correcting the influence of grain size on ultrasonic evaluation of material stress. Background technique [0002] The service reliability of welded structures is the key to promoting and ensuring the efficient and safe integration of welded products into the market cycle. Therefore, the guarantee of service reliability of welded structures is extremely important to promote the application of welded products in the industrial field. Relevant studies have shown that evaluating the factors that affect the service reliability of welded structures is an effective way to ensure service reliability, and welding stress is one of the key factors. A large number of experimental and theoretical studies have been carried out, such as: ① research on welding process optimization; ② research on new welding methods or the combination of mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/44
CPCG01N29/4463
Inventor 刘彬缪文炳吴绪磊李瑞峰
Owner 中兴海陆工程有限公司
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