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Round steel grain boundary oxidation detection method

A grain boundary oxidation and detection method technology, which is applied in the direction of measuring devices, test crystals, and material analysis by measuring secondary emissions, can solve problems such as large deviations in detection results, reduce grain boundary oxidation misjudgments, reduce Detect the effects of fluctuations and deviations

Active Publication Date: 2020-07-17
SGIS SONGSHAN CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results of grain boundary oxidation are only checked for "yes" or "no" according to the observation situation, without detailed description and depth measurement. Different inspectors have very different understandings of grain boundary oxidation due to limited experience, and the test results are usually different. There is a large deviation

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  • Round steel grain boundary oxidation detection method
  • Round steel grain boundary oxidation detection method
  • Round steel grain boundary oxidation detection method

Examples

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Embodiment 1

[0047] Take the grain boundary oxidation detection of spheroidized material 10B21 and diameter φ5.5mm disc wire rod as an example.

[0048] 1. Sampling

[0049] The diameter of the disc is φ5.5mm, and the transverse full-section sample is directly intercepted;

[0050] 2. Sample preparation

[0051] The sample is thermally mounted with edge-preserving mounting material, and the sample is roughly ground, finely ground, finely ground, polished, cleaned, etc. by an automatic grinding and polishing machine to prepare a polished surface with high surface finish and rounded edge of the sample. State samples, no need to etch;

[0052] 3. Sample observation

[0053] Use a metallographic microscope to observe the prepared sample, gradually zoom in from low magnification to high magnification, and observe in detail along the arc of the sample surface. From the surface of the round steel, continuous or intermittent black, yellow, blue, Grain boundary coarsening such as gray is grain ...

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Abstract

The invention relates to a round steel grain boundary oxidation detection method. The method comprises the following steps: S1, sampling: sampling samples with different diameters, wherein a sample detection surface is a cross section sample vertical to a longitudinal axis of round steel; S2, preparing a sample, and preparing the sample into a metallographic sample with high surface smoothness anda round edge; S3, observing grain boundary oxidation, wherein grain boundary coarsening structures of different colors which are continuous or intermittent along a grain boundary are grain boundary oxidation; S4, measuring grain boundary oxidation, selecting the deepest uniform grain boundary oxidation area for five times of random measurement, and taking an average value as a grain boundary oxidation depth; and S5, carrying out data processing, and determining a final result of grain boundary oxidation according to a sampling rule and a position. Excellent round steel depth processing and use requirements can be met.

Description

technical field [0001] The invention relates to the technical field of a material detection method, more specifically, it relates to a method for detecting oxidation of round steel grain boundaries. Background technique [0002] When steel materials are rolled, heated or heat treated, if the heating temperature is too high and the time is too long, oxidation will occur at the grain boundaries on the surface of the material. Grain boundary oxidation is an oxidation process that occurs preferentially along the grain boundaries of metals or alloys. The reason for oxidation is that foreign oxygen atoms diffuse faster along the grain boundaries than inside the grains, thereby forming metal oxides along the grain boundaries. After grain boundary oxidation of metal materials, the surface strength, ductility and closure are greatly reduced, and the toughness of the metal drops sharply. Grain boundary oxidation is irreversible. Materials with severe grain boundary oxidation can only ...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N23/22
CPCG01N21/84G01N23/22G01N2021/8477
Inventor 肖命冬曾赞喜林晏民罗新中李富强朱祥睿张兆洋章玉成麻国晓陆伟成杨明梅
Owner SGIS SONGSHAN CO LTD
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