Nonlinear ultrasound system used for detecting super austenitic stainless steel inter-granular corrosion

An austenitic stainless steel, nonlinear ultrasonic technology, which is applied in the processing of the detected response signal and the use of sonic/ultrasonic/infrasonic waves to analyze solids and other directions. Effect

Inactive Publication Date: 2013-09-25
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

[0004] In the prior art, there is no nonlinear ultrasonic system and method for detecting intergranular corrosion defects of super austenitic stainless steel Super304H

Method used

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  • Nonlinear ultrasound system used for detecting super austenitic stainless steel inter-granular corrosion
  • Nonlinear ultrasound system used for detecting super austenitic stainless steel inter-granular corrosion
  • Nonlinear ultrasound system used for detecting super austenitic stainless steel inter-granular corrosion

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Embodiment

[0057] The use of the method and system of the present invention is illustrated by taking the detection of intergranular corrosion of Super304H austenitic stainless steel as an example. The materials used in the examples are Super304H austenitic stainless steel produced by Sumitomo, Japan, and their chemical composition is shown in Table 1.

[0058] Table 1 Chemical composition of raw material Super304H stainless steel

[0059]

[0060] Stainless steel sulfuric acid + copper sulfate + copper chip corrosion method was used to prepare Super304H austenitic stainless steel corrosion samples with different corrosion degrees. and Alloy Corrosion Stainless Steel Intergranular Corrosion Test Method" and Microstructure Analysis Method. Among them: sample S1 has no cracks in the original state, hot corrosion state, and sensitized + hot corrosion state; sample S2 has no cracks in the original state and hot corrosion state, but cracks appear in the specimen after hot corrosion and sen...

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Abstract

The invention relates to a nonlinear ultrasound system used for detecting super austenitic stainless steel inter-granular corrosion. The system comprises a host computer (1), an excitation and receiving module (2), a power amplification module (3), a multi-channel switching circuit (4), an ultrasound transmitting probe (5), and an ultrasound receiving probe (6). The excitation and receiving module (2) is composed of a DSP chip (21), a synchronization module (22), an excitation board (23), and a receiving board (24). The DSP chip is connected with the host computer and outputs to the synchronization module and the excitation board, and the DSP chip reads the signals of the receiving board. With the synchronization module, the signals of DSP are respectively outputted to the excitation board and the receiving board. The excitation board outputs to the ultrasound transmitting probe through the power amplification module and the multi-channel switching circuit. The receiving board reads the signals of the ultrasound transmitting probe through the multi-channel switching circuit. The invention also relates to a nonlinear ultrasonic method for detecting Super304H steel tube inter-granular corrosion by using the system.

Description

technical field [0001] The invention relates to a nonlinear ultrasonic system for detecting intergranular corrosion of super austenitic stainless steel Super304H, in particular to a nonlinear ultrasonic system for discriminating intergranular corrosion of super austenitic stainless steel Super304H without destroying detection components. The invention also relates to a nonlinear ultrasonic method for detecting intergranular corrosion of a super austenitic stainless steel Super304H steel pipe (Ф32-Ф159) by using the system. Background technique [0002] Super304H steel is a new type of fine-grained austenitic heat-resistant stainless steel developed in recent years. Due to its excellent durable strength, high temperature oxidation resistance, steam corrosion resistance and cost performance, it is widely used in the manufacture of ultra-supercritical thermal power unit boilers for superheating in the high temperature section and reheater tubes. The design temperature of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
Inventor 钟飞张春雷虞月荣钟力强林介东聂铭
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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