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Method for measuring austenite content in steel by using X-ray diffraction technology

A technology of austenite content and technology measurement, which is applied in the field of X-ray diffraction test, can solve the problems of cumulative intensity ratio exceeding and not mentioning, etc.

Active Publication Date: 2014-05-21
NANJING IRON & STEEL CO LTD
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Problems solved by technology

[0005] However, in the presence of texture (i.e., preferred orientation) in the specimen, the cumulative strength ratio of the specimen tends to exceed this fluctuation range
However, the standard does not mention how researchers should analyze and process diffraction data when the intensity ratio exceeds the allowable range

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  • Method for measuring austenite content in steel by using X-ray diffraction technology

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Embodiment 1

[0033] This embodiment provides a method for measuring austenite content in steel using X-ray diffraction technology, including the following specific steps:

[0034] Step (1): Use an X-ray diffractometer to scan the steel sample to obtain the XRD pattern of the steel sample. The scanning speed is less than or equal to 1° / min to improve the signal-to-noise ratio and obtain a high-quality XRD pattern;

[0035] Step (2): Use the XRD spectrum in step (1) and the following formula to calculate the relative diffraction intensity when each crystal plane of martensite and austenite has no preferred orientation:

[0036] I = M · L P · F 2 · e - 2 M · A * ( θ ) - - ...

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Abstract

The invention discloses a method for measuring austenite content in steel by using an X-ray diffraction technology. The method comprises the following steps: firstly, scanning a steel test sample by using an X-ray diffractometer to obtain an XDR (External Data Representation) graph; revising martensite and austenite by using the XDR graph and calculating the diffraction strength of each crystal face; and finally, measuring the content of the austenite in the steel test sample. With the adoption of the designed method for measuring the content of the austenite in the steel by using the X-ray diffraction technology, the measurement accuracy of the content of the austenite in the steel is improved under the condition that the test sample has a texture.

Description

technical field [0001] The invention belongs to the field of X-ray diffraction (X-Ray Diffraction, XRD) test, and more specifically, the invention relates to a method for measuring austenite content in steel by using X-ray diffraction technology. Background technique [0002] At present, the determination of austenite content in steel often adopts the direct comparison method. According to the standard GB / T8362-1987 and YB / T5338-2006 "X-ray Diffraction Method for Quantitative Determination of Retained Austenite in Steel": the martensite uses the diffraction lines of (200) and (211) two crystal planes, and the austenite Select (200), (220), (311) three-crystal plane diffraction lines for the body, combine the measured five diffraction lines and calculate the diffraction intensity ratio respectively, and substitute into the specified calculation formula to obtain the austenite content. However, the prerequisite for applying this calculation formula is that the cumulative inte...

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Application Information

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IPC IPC(8): G01N23/20
Inventor 杨英范益卞欣
Owner NANJING IRON & STEEL CO LTD
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