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Method for determining Laves phase content in steel

A technology of phase content and workpiece, applied in the field of metallurgy, can solve the problems of complicated sample preparation process of transmission electron microscope, troublesome carbide extraction and experimental process, randomness of testing, etc., to improve the probability of successful test, save test time, The effect of saving the trouble of transmission sample preparation

Inactive Publication Date: 2015-03-25
WUHAN UNIV
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Problems solved by technology

[0010] M. Mattestrand et al. (2001) used energy-filtered transmission electron microscopy to identify Laves phases to achieve true, accurate and clear qualitative identification. However, the sample preparation process of transmission electron microscopy is complicated and the field of view of the test is small, making the test random
Wang Xue et al. (2012) used a backscattered scanning microscope to identify Laves phases based on contrast differences, and counted the particles. This method has a relatively wide field of view and the measurement process is relatively simple. However, in the identification, the image contrast is affected by many factors. It can be seen that the determination of this method is not accurate
In the XRD determination method, the carbide extraction and experimental process are also cumbersome, and the experimental results are unstable.

Method used

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  • Method for determining Laves phase content in steel
  • Method for determining Laves phase content in steel
  • Method for determining Laves phase content in steel

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Embodiment

[0030] The composition is shown in Table 1. Samples were taken from T91 pipes with a specification of Ф60mm*10mm. The samples were subjected to an accelerated aging test at 675°C and 70MPa for 900 hours. After aging, the Laves phase content of the samples was quantitatively determined.

[0031] Table 1 is the standard composition of T91 steel in the implementation example

[0032]

[0033] The determination method is as follows:

[0034] Step 1: Use wire cutting to take out the sample from the pipe, wash it with alcohol acetone, blow dry, and use a small file to slowly file the material from the small sample into small particles. Be busy during the file to ensure that the temperature will not rise too high.

[0035] Step 2: Take the small particles and place them in the sample chamber of the Mössbauer instrument. The Mössbauer instrument adopts the transmission constant acceleration mode to measure the relationship between the gamma ray count and the modulation energy that ...

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Abstract

The invention relates to a method for determining Laves phase content in steel. In a Mossbauer spectroscopy instrument, with a transmission mode, a sample is determined, such that a relationship between sample count and Doppler velocity is obtained; the obtained experiment data is placed in Recoil; possible peak spectrum number and corresponding possible phases are determined according to spectral line shape and iron-containing phase; the influence value of the element in spectral line possible corresponding phase upon the hyperfine field value iron element is introduced into the software, and automatic fitting is carried out; when peak spectral shapes are consistent and error value is low, fitting is finished; the fitting result is exported, and the proportion of the corresponding phase is viewed. With the method provided by the invention, a sample preparation technology is simple, the proportion value of iron-containing phase in steel can be obtained, and the result is accurate.

Description

technical field [0001] The invention relates to a method for measuring the content of laves phase in steel, which belongs to the technical field of metallurgy. Background technique [0002] In recent years, in order to solve the increasingly prominent energy shortage and environmental pollution problems, high-efficiency super (super) critical voltage power generation has become a hot topic in the world. The parameters of thermal power generating units in various countries in the world are developing from subcritical parameters (16.77MPa, 540℃) to supercritical parameters (25.0MPa, 540℃~566℃; 24.0~30.0MPa, 580℃~610℃), so that the thermal efficiency can be increased by 6 ~7%. Improving thermal efficiency is mainly a thermal power issue. By increasing steam parameters, that is, increasing steam pressure and temperature, thermal efficiency of power plants can be significantly improved. When the steam parameters of the unit reach 22MPa and above 570°C, in such a temperature and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/06
Inventor 杨兵万强王如意刘辉东
Owner WUHAN UNIV
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