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Thermal expansion phase change measurement method based on DIC

A measurement method and thermal expansion technology, applied in the field of detection and analysis, can solve the problems of expensive equipment and complicated operation of phase change devices, and achieve the effect of real and intuitive results, simple operation, accurate and reliable results

Active Publication Date: 2020-03-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of expensive equipment and complicated operation of the existing phase change devices, and to determine the phase change point of materials more accurately and conveniently, the present invention proposes a thermal expansion phase change measurement method based on DIC

Method used

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  • Thermal expansion phase change measurement method based on DIC
  • Thermal expansion phase change measurement method based on DIC
  • Thermal expansion phase change measurement method based on DIC

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Embodiment Construction

[0044] In order to better illustrate the purpose and advantages of the present invention, the content of the invention will be further described below in conjunction with the accompanying drawings and examples.

[0045] Adopt content of the present invention to measure the phase transformation critical point of high strength steel 45CrNiMoV, comprise the steps:

[0046] Step 1. Sample preparation.

[0047] The overall process of the DIC-based thermal expansion phase change measurement method is as follows: figure 1 shown.

[0048] For the 45CrNiMoV used in the test, according to the size required by the ZEISS metallographic heating stage, it was first processed by wire cutting The size of the observation surface is obtained by mechanical grinding, polishing and other methods, and certain grinding traces are retained as DIC tracking points whose shape remains basically unchanged during the heating and cooling process. Before the test, it is required to ensure that the oxida...

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Abstract

The invention relates to a thermal expansion phase change measurement method based on DIC, and belongs to the field of detection and analysis. The invention provides a thermal expansion phase change measurement method based on DIC in order to solve the problems that an existing phase change device is expensive in equipment and complex in operation and determine the phase change point of a materialmore accurately and conveniently. The method is based on a hot stage microscope. The heating and cooling processes are controlled through a control program of the heating stage microscope, through animage capturing control program, a high-speed camera is used for continuously shooting a sample in heating and cooling processes through a microscope. The distance between the lens and the surface ofthe material is kept constant. The strain field of the surface of the sample is obtained through a DIC method, the average strain value of the sample in all directions is obtained accordingly, the average strain value serves as the expansion amount of the material to draw a thermal expansion curve, and the method has the advantages of being simple in equipment and accurate and reliable in measurement result.

Description

technical field [0001] The invention relates to a DIC-based thermal expansion phase change measurement method, which belongs to the field of detection and analysis. Background technique [0002] Materials, especially metal materials, in the process of gradually increasing temperature, the internal microstructure, such as grain size, morphology, element distribution, etc. will gradually change. When the temperature reaches a certain value, the phase transition of the material occurs, and the internal crystal structure changes, which has a very important impact on the properties of the material. For iron and steel materials, the austenite transformation temperature varies with the internal chemical composition of the material, heat treatment state and other factors. As an important characterization parameter of material properties, phase transition point is of great significance to engineering applications. Therefore, it is necessary to carry out specific phase transition tes...

Claims

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Application Information

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IPC IPC(8): G01N25/12
CPCG01N25/12
Inventor 解丽静高飞农宋博文庞思勤王西彬
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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