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Method for quantitatively measuring remaining austenite in steel by X-ray diffraction polar diagram data

A technique for the quantitative determination of retained austenite for applications such as material analysis using radiation diffraction

Inactive Publication Date: 2009-06-03
WUHAN IRON & STEEL (GROUP) CORP
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Problems solved by technology

In addition, there are many other methods for measuring retained austenite, but there are essential differences with this method in the measurement principle and method

Method used

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  • Method for quantitatively measuring remaining austenite in steel by X-ray diffraction polar diagram data
  • Method for quantitatively measuring remaining austenite in steel by X-ray diffraction polar diagram data
  • Method for quantitatively measuring remaining austenite in steel by X-ray diffraction polar diagram data

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] The feature of the method adopted in the present invention is that X-ray diffraction analysis technology is combined with texture attachment, and its basic principle is as follows:

[0021] There is a piece of iron and steel material to be tested i, which contains two phases of austenite (γ phase) and martensite (α phase) (or ferrite), and at the same time there is a The physical state and chemical composition of the pure α phase (or pure ferrite) standard sample j with the same or similar chemical composition, and there is no texture in the standard sample, then the volume percentage of α phase in sample i is X iα There is the following relationship between the X-ray diffraction intensity I of its (hk1) crystal plane:

[0022] I iα I jα = ...

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Abstract

The invention relates to a method for quantitatively measuring remaining austenite in steel by X-ray diffraction polar diagram data. The method is as follows: a lumpy steel material sample to be measured and a pure martensite standard sample that the physical condition and chemical composition are the same as or similar to the physical condition and chemical composition of the sample to be measured are prepared for eliminating residual stress of the surfaces of the sample and the standard sample; the sample and the standard sample are put into a polar diagram measuring device respectively; the sample or the standard sample is placed at the positions of different alpha angles, and true diffraction intensities of different diffraction maximums are obtained; and the contents of martensite in sample i at each alpha angle are obtained with formulas; the contents of the austenite in the sample are calculated according to the contents of the martensite; the average value of the results of the contents of the austenite in the sample at each alpha angles is considered as the final result of the contents of austenite in the sample, and the measuring process is finished. By the measurement adopting the method of the invention, the effect of texture on measuring result can be effectively eliminated, and the difference between the measuring result and the true value is narrowed.

Description

technical field [0001] The invention belongs to a method for measuring austenite content in iron and steel materials, in particular to a method for quantitatively measuring residual austenite in steel by using X-ray diffraction pole figure data. Background technique [0002] Metal materials, especially iron and steel materials, often have a certain amount of retained austenite after quenching (there is also martensite in the material), and the hardness of austenite is much lower than that of martensite, so in the material Soft spots will appear; at the same time, austenite is unstable at room temperature and will decompose during use, causing the volume of the material to change, resulting in a large amount of stress in the material and easily causing deformation. Therefore, in order to improve the mechanical properties and service life of the material, it is necessary to accurately measure the content of austenite in the material, so as to adopt a reasonable heat treatment ...

Claims

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Application Information

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IPC IPC(8): G01N23/20
Inventor 周顺兵李长一陈士华李立军吴立新
Owner WUHAN IRON & STEEL (GROUP) CORP
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