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Correcting method for evaluating material stress by influencing ultrasonic waves through grain sizes

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 velocity

Active Publication Date: 2016-08-24
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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  • Correcting method for evaluating material stress by influencing ultrasonic waves through grain sizes
  • Correcting method for evaluating material stress by influencing ultrasonic waves through grain sizes
  • Correcting method for evaluating material stress by influencing ultrasonic waves through grain sizes

Examples

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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 correcting method for evaluating material stress by influencing ultrasonic waves through grain sizes, and belongs to the technical field of ultrasonic harmless evaluation. According to the method, on the basis of energy attenuation analysis of ultrasonic waves in samples, a dual-ultrasonic probe constant in transmission distance is prepared, samples of different grain sizes are obtained through a heat treatment method, and the relation between the time difference of ultrasonic signals of the samples of different grain sizes and the stress is calculated and established through an ultrasonic acoustic elasticity coefficient calibration experiment, ultrasonic acoustic elasticity coefficients of the samples of different grain sizes are obtained through a linear fitting function, the function between the ultrasonic acoustic elasticity coefficients and the grain sizes is obtained through power function fitting, and correction for evaluating material stress by influencing ultrasonic waves through grain sizes is achieved. The harmless method is provided for evaluating material stress influenced by grain sizes and has the advantages of being rapid, convenient to implement, safe, capable of achieving 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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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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