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A method for identifying multiple metals by ultrasonic non-destructive detection

A non-destructive detection and metal technology, which is applied in the preparation of test samples and the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. Accurate and reasonable identification results

Inactive Publication Date: 2016-02-17
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chemical methods are relatively complicated and chemical reactions occur during identification, which can damage metal products
[0010] In addition, the above-mentioned traditional identification methods usually require the cooperation of several methods to identify them, which is relatively complicated.

Method used

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  • A method for identifying multiple metals by ultrasonic non-destructive detection
  • A method for identifying multiple metals by ultrasonic non-destructive detection
  • A method for identifying multiple metals by ultrasonic non-destructive detection

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Taking stainless steel, 304 stainless steel and 2A13 aluminum alloy as examples, the method of identifying these three metals by ultrasonic nondestructive detection consists of the following steps:

[0024] (1) Polish and clean the rectangular stainless steel, 304 stainless steel and 2A13 aluminum alloy reference samples with a thickness of 30 mm respectively;

[0025] (2) Fix the transceiver probes with a frequency f1 of 5MHz on the surfaces of the above three reference samples respectively, transmit a pulse signal with a frequency of 5MHz and collect the bottom reflection signals of the three reference samples. This example uses a commercially available 5077PR pulse Transmitting and receiving instrument and Puyuan RIGOLDS1052E digital oscilloscope process the collected reflection signal and send it to the computer for further processing, measure and calculate the sound velocity, sound attenuation coefficient and peak value of the primary bottom echo in the amplitude sp...

Embodiment 2

[0048] Now take the stainless iron sample as an example, put it at room temperature, 800°C|260°C / h↑|6h (heating treatment at 260°C per hour, heat preservation for 6 hours when the temperature rises to 800°C, natural cooling), 900°C| 260°C / h↑|6h (heat treatment at 260°C per hour, heat preservation for 6 hours when the temperature rises to 900°C, and natural cooling) Three samples under three heat treatment conditions were identified by ultrasonic non-destructive detection method. The method is as follows The steps consist of:

[0049] (1) For the known stainless iron reference samples under normal temperature conditions, the stainless iron reference samples under the conditions of 800°C|260°C / h↑|6h, and the conditions of 900°C|260°C / h↑|6h The surface of the stainless steel reference samples was polished and cleaned respectively.

[0050] (3) Take samples 1H-1, 1H-2, and 1H-3 as samples to be tested, and grind and clean their surfaces respectively so that the surface roughness ...

Embodiment 3

[0054] In step (2), the transceiver probes with a frequency f1 of 2.5 MHz are respectively fixed on the surfaces of the above three reference samples, a pulse signal with a frequency of 2.5 MHz is transmitted and the bottom reflection signals of the three reference samples are collected, measured and calculated The sound velocity, sound attenuation coefficient, peak frequency and bandwidth of a back-wall echo in the amplitude spectrum and the peak frequency and bandwidth of a back-wall echo in the power spectrum of each reference sample are obtained. In step (5), use a transceiver probe with a frequency f2 of 5 MHz, repeat steps (2) and (3), and obtain the sound velocity, sound attenuation coefficient, and amplitude spectrum of the reference sample and the sample to be tested under the condition of f2. The peak frequency and bandwidth of a backwall echo and the peak frequency and bandwidth of a backwall echo in the power spectrum are compared again with the parameters of the re...

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Abstract

The invention relates to a method for identifying multiple metals by utilizing an ultrasonic non-destructive detection method. The method comprises the following steps: carrying out metal reference sample pretreatment; carrying out metal reference sample sound parameter detection; carrying out to-be-detected metal sample sound parameter detection; and carrying out parameter comparison on a to-be-detected metal sample and a metal reference sample, wherein if sound parameters are equal, the materials of the to-be-detected metal sample and the metal reference sample are the same, and if the sound parameters are different, the ultrasonic frequency is exchanged to carry out repeated detection until metal materials corresponding to all the to-be-detected metal samples are identified. According to the identifying method disclosed by the invention, metal products do not need to be damaged and cannot be damaged during an identifying process, and the non-destructive identification is realized; besides, compared with traditional physical and chemical identifying methods, the method has the advantages that an identifying result can be obtained by singly utilizing the method, the method does not need to be matched with multiple methods, the identifying method is relatively simple, the cost is low, the identifying result is accurate and reasonable, and even if the different metal products obtained from the same material under different heat treatment conditions can be identified one by one.

Description

technical field [0001] The invention relates to a method for identifying metals, in particular to an ultrasonic non-destructive detection method for identifying various metals. Background technique [0002] Due to the gradual reduction of global resources, the price of raw materials has been rising all the way in recent years. Some raw material suppliers or metal manufacturers replace higher-priced raw materials with cheaper metal substitutes, or cut corners to produce products that do not meet international standards. Or the metal products specified by buyers, causing major safety accidents. In addition, some people carry out high-level imitation of metal products and ancient cultural relics in order to make huge profits, which makes it difficult to distinguish genuine products from fakes. Therefore, the identification and analysis of metal materials is becoming more and more important. [0003] At present, the commonly used identification methods of metal materials inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N1/28
Inventor 贺西平张宏普贺升平田彦平
Owner SHAANXI NORMAL UNIV
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