A method for detecting carbides in steel

A carbide and steel technology, applied in the direction of electrochemical variables of materials, etc., can solve problems such as being unsuitable for industrial field testing, long material life evaluation time, and complicated experimental equipment, achieving rapid testing and result analysis, fast testing speed, and data. Handling simple effects

Active Publication Date: 2022-01-04
SUN YAT SEN UNIV
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Problems solved by technology

The detection method of the present invention can solve the problems that other detection methods have a long time for material life evaluation, complicated experimental devices, and are not suitable for industrial on-site detection.

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  • A method for detecting carbides in steel
  • A method for detecting carbides in steel
  • A method for detecting carbides in steel

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Embodiment Construction

[0050] The content of the present invention will be described in further detail below through specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples can be obtained from conventional commercial channels, or can be obtained through prior art methods. Unless otherwise specified, experiments or testing methods are conventional methods in the art.

[0051] Taking the detection of carbide content in P92 heat-resistant steel tempered at different times as an example, the detection method of the embodiment of the present invention will be described below.

[0052] In order to illustrate that the tempered samples contain carbides, the microscopic morphology of the samples tempered at different times was observed by scanning electron microscopy (SEM). P92 steel samples for comparison. attached figure 1 Shown is the scanning electron micrograph of carbide-containing P92, with figure 2 Shown is the SEM image of carbide-free P92.

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Abstract

The invention discloses a method for detecting carbides in steel, which comprises the following steps: 1) making a steel sample into a working electrode, and then assembling an electrochemical testing device of a three-electrode system; The electrode is placed in the lye, and the potentiodynamic polarization scan is carried out to obtain the polarization curve of the current density versus the electrode potential; 3) the current density and polarization time curve are made according to the polarization curve, and the current density and the polarization time curve on the current density and polarization time curve The peak is integrated, and the dissolved electricity of the carbide in the steel sample is calculated from the integrated area of ​​the peak; 4) The content of the carbide in the steel sample is calculated according to the dissolved electricity of the carbide. The method for detecting carbides in steel has the advantages of simple sample preparation, fast test speed, and less damage to the surface of samples, and the detection equipment is small in size and easy to carry, and is suitable for on-site detection of carbide content in steel.

Description

technical field [0001] The invention relates to the technical field of material detection, in particular to a method for detecting carbides in steel. Background technique [0002] The ultra-supercritical unit and its power generation technology is one of the mature and advanced clean coal power generation technologies in the world, and it is also an important direction in the current clean coal power generation technology. Due to its excellent structural stability and good high-temperature strength, steel has become one of the best candidate materials for thick-walled parts of ultra-supercritical units, and has been widely used in ultra-supercritical units that have been put into production and are under construction. Due to the long-term operation in the harsh environment of high temperature, the material will inevitably produce different degrees of creep damage. Creep will cause changes in the microstructure of metal materials, which will cause plastic deformation of the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 徐健颜佳音袁随吴云龙郭琦
Owner SUN YAT SEN UNIV
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