Measuring method of Laves phase content of T/P 92 steel

A measurement method and phase content technology, which is applied in the direction of material analysis by measuring secondary emissions, can solve the problems of the small number of Laves phase particles, the distribution is not statistically significant, and the error of quantitative results, achieving a wide range of observation areas and manufacturing Simple and easy to operate

Inactive Publication Date: 2013-01-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

However, the area observed by TEM is very limited, the number of Laves phase particles in each field of view is small,

Method used

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  • Measuring method of Laves phase content of T/P 92 steel
  • Measuring method of Laves phase content of T/P 92 steel
  • Measuring method of Laves phase content of T/P 92 steel

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Embodiment Construction

[0040] The composition is shown in Table 1, and the P92 steel pipe with a specification of φ325mm×71mm is sampled and subjected to aging treatment at 650°C for 5000h, and the Laves phase content in the state T / P92 steel is quantified.

[0041] The chemical composition (wt.%) of table 1 embodiment P92 steel

[0042]

[0043] The assay method comprises the following steps:

[0044] Step 1: Sampling and grinding metallographic samples, and then corroding them with picric hydrochloric acid alcohol solution synthesized by 1g picric acid + 5ml hydrochloric acid + 100ml ethanol, keeping the samples dry and having good electrical conductivity, and preparing samples for SEM observation.

[0045] Step 2, randomly select 6 fields of view to take SE and BSE photos respectively, and the magnification is 5000 times.

[0046] If the magnification is too low, the Laves phase is too small to be observed and identified; if the magnification is too high, the number of Laves phases in the fie...

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Abstract

The invention relates to a measuring method of Laves phase content of T/P 92 steel. The measuring method comprises the following steps: S1, sample preparation; S2, observing a sample under an SEM (Scanning Electron Microscope): optionally selecting at least five fields, respectively taking photos of a secondary electron (SE) and a back scattered electron (BSE) in a magnification time of 2500-5000; S3, identifying Laves phase particles: in the photo of the back scattered electron, compared with a M23C6 particle, the contract between the Laves phase and a matrix is higher, the luminance is larger, and determining the particle with a luminance different larger than 10% as the Laves phase; S4, image processing: carrying out binarization processing on the photos by image processing software Photoshop; S5, quantitative analysis of the image; and S6, statistical result processing. According to the measuring method of the Laves phase content of the T/P 92 steel provided by the invention, the sample preparation is simple, the operation is convenient, the range of viewing area is wide, the number of Laves phase particles of each field is large, and the distribution has statistical significance, so that the errors in subsequent quantitative results are small.

Description

technical field [0001] The invention relates to a method for measuring the Laves phase content of T / P92 steel, in particular to a method for measuring the Laves phase content of T / P92 steel after long-term high-temperature service. Background technique [0002] T / P92 steel is a new type of 9%Cr martensitic heat-resistant steel obtained by adding 1.5-2.0%W on the basis of T / P91 steel, reducing Mo, and adding a small amount of B. The alloying improvement makes it creep fracture The strength is about 30% higher than that of T / P91 steel. It is widely used in high-temperature and high-pressure steam pipes, including the main steam pipes, headers, superheaters, reheaters and other large-diameter thick-walled pipes of ultra-supercritical boilers in power stations, and small heating surfaces. High temperature parts of bore pipe. [0003] T / P92 steel will precipitate an intermetallic compound containing W during long-term service at high temperature, the so-called Laves phase. It h...

Claims

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Application Information

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IPC IPC(8): G01N23/22
Inventor 王伟王学钟万里于淑敏胡平任遥遥
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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