GB/T 37787-2019 in English
VALIDMetallic materials—Determination of microporosity—Fluorescence method
- Issued on:2019-08-30
- Implemented on:2020-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
《GB/T 37787-2019金属材料 显微疏松的测定 荧光法》由TC183（全国钢标准化技术委员会）归口，TC183SC14（全国钢标准化技术委员会金相检验方法分会）执行，主管部门为中国钢铁工业协会。
Introduction
1. Background and significance of standard formulation
GB/T 37787-2019 "Determination of microporosity of metallic materials by fluorescence method" is an important national standard proposed by the China Iron and Steel Association. This standard is based on the fluorescence infiltration technology and is used to detect the percentage of microporosity in metallic materials. The background of its formulation is mainly due to the high requirements of modern manufacturing industry for material performance, especially in the fields of casting and 3D printing, where the presence of microporosity will seriously affect the mechanical properties and service life of the material.
2. Comparative analysis of standard frameworks
| Standard dimensions | GB/T 37787—2019 | International integration | Expansion of scope of application |
|---|---|---|---|
| Term definitions | The definitions of "microporosity" and "fluorescent infiltration" are clearly defined. | It is consistent with international standards (such as ISO 12405 series). | It is applicable to cast metal materials and 3D printed metal materials, and can also be extended to ceramics, powder metallurgy and other fields. |
| Measurement method | Includes fluorescence imaging module configuration and quantitative metallographic detection. | Uses internationally accepted image analysis technology. | Supports dual modes of manual measurement and image analysis to improve detection efficiency. |
| Accuracy requirements | Relative error does not exceed 10%. | Same as the international standard accuracy level. | Suitable for high-precision and large-volume detection needs. |
3. Analysis of technology development and evolution
The detection technology of microporous has experienced progress from traditional metallographic microscope observation to modern fluorescence method. Traditional methods rely on manual experience, with low efficiency and limited accuracy. However, the fluorescence impregnation technology significantly improves the sensitivity and accuracy of detection by introducing epoxy resin and fluorescent agent, combined with vacuum injection process. With the development of image analysis technology, digital measurement has become possible, further promoting technological progress in this field.
4. Implementation suggestions and precautions
Implementation suggestions:
- Prepare the sample strictly in accordance with the standard requirements to ensure the accuracy of the surface treatment and fluorescence impregnation process.
- Select the appropriate microscope configuration and adjust the magnification and the number of measurement fields according to the detection requirements.
- In the data processing stage, the image analysis method is preferred, and attention should be paid to the relative error control (no more than 10%).
Notes:
- The ratio of fluorescent impregnation agent and vacuum pressure must be strictly controlled to avoid affecting the test results.
- During the measurement process, pay attention to the morphological characteristics of microporous to ensure the representativeness of the data.
- For complex materials (such as 3D printed parts), it is recommended to increase the number of measurement fields to improve the detection accuracy.
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