Method for evaluating non-metallic inclusions in high-strength steel

A technology of non-metallic inclusions and high-strength steel, applied in the direction of applying stable tension/compression to test the strength of materials, etc., can solve the problems of huge evaluation cost, long test time, and complicated processing of fatigue samples, so as to save time and The effect of cost, reliable technical basis

Inactive Publication Date: 2019-07-12
BEIJING JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

However, the processing of fatigue samples is complicated, the test takes a long time, and the number of inclusions obtained is small, so the cost of inclusion evaluation by fatigue test method is undoubtedly huge

Method used

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  • Method for evaluating non-metallic inclusions in high-strength steel
  • Method for evaluating non-metallic inclusions in high-strength steel
  • Method for evaluating non-metallic inclusions in high-strength steel

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Embodiment

[0040] An embodiment of the present invention provides a method for evaluating non-metallic inclusions in high-strength steel, comprising the following steps:

[0041] 1) Process the steel as the evaluation object into tensile specimens after heat treatment;

[0042] 2) Charge the tensile sample with hydrogen, and obtain the appropriate hydrogen content by controlling the hydrogen charging process parameters (current density, hydrogen charging time, etc.);

[0043] 3) Carry out a room temperature tensile test to obtain the fracture of the tensile specimen;

[0044] 4) Observe and measure the morphology, size and chemical composition of non-metallic inclusions on the fracture of the tensile specimen under scanning electron microscope and other equipment;

[0045] 5) Statistical analysis was carried out on the characteristic data of non-metallic inclusions on the fracture surfaces of multiple hydrogen-charged tensile specimens, and the extreme value statistical method was used ...

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Abstract

The invention provides a method for evaluating non-metallic inclusions in high-strength steel, which belongs to the technical field of steel material quality detection and comprises the following steps: firstly, preparing a certain number of tensile samples and carrying out a forced hydrogenation test; performing a conventional tensile test after strong hydrogenation; and carrying out electron microscope analysis and observation on the tensile fracture. A plurality of obvious brittle platforms exist on the hydrogen filling tensile fracture, and non-metallic inclusions exist in the centers of the brittle platforms. The size of the non-metallic inclusions is obtained through fracture observation, and the maximum size of the non-metallic inclusions in a certain volume of steel is estimated bycombining with an extreme value statistical method. The method has the beneficial effects that a novel efficient assessment technology for the non-metallic inclusions in the high-strength steel is provided, the characteristics of convenience, accuracy, economy and the like are achieved, and technical support can be provided for efficient assessment of the metallurgical quality of the steel. Large-size non-metallic inclusions in high-cleanliness steel can be evaluated, and the conditions of components, distribution, content and the like of the inclusions can be accurately obtained.

Description

technical field [0001] The invention relates to the technical field of steel material quality detection, in particular to a non-metallic inclusion evaluation method for high-strength and high-cleanness steel. Background technique [0002] With the development of my country's industrial technology, the reliability requirements for mechanical equipment and components are getting higher and higher. Therefore, higher requirements are also placed on the performance of high-strength steel for machinery manufacturing. Non-metallic inclusions, especially large-sized Inclusions seriously affect the properties of high-strength steels. Improving the cleanliness of steel, reducing the number of non-metallic inclusions, and reducing the size of inclusions are the keys to improving the performance of steel. Due to the low occurrence rate of inclusions in high cleanliness steel and the limitations of traditional inclusion detection methods, it is very difficult to detect non-metallic inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 张永健惠卫军赵晓丽肖娜
Owner BEIJING JIAOTONG UNIV
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