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T/P91 steel ageing rating method based on precipitated phase fractional area

A technology of area fraction and precipitated phase, which is applied in the preparation of test samples, material analysis by measuring secondary emissions, instruments, etc., to achieve the effect of convenient work

Inactive Publication Date: 2012-09-26
WUHAN UNIV
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Problems solved by technology

However, in the practice of evaluating the aging of T / P91 steel, technicians generally rely on experience to give a conclusion on the degree of aging, which is highly subjective and causes certain confusion to relevant scientific research and technical personnel.
At present, there is no more objective method for aging rating of T / P91 steel

Method used

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  • T/P91 steel ageing rating method based on precipitated phase fractional area
  • T/P91 steel ageing rating method based on precipitated phase fractional area
  • T/P91 steel ageing rating method based on precipitated phase fractional area

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Embodiment Construction

[0029] The present invention proposes a T / P91 steel aging rating method based on the area fraction of precipitated phases, and its specific implementation method is as follows:

[0030] First, intercept the sample to be evaluated and prepare the metallographic sample, specifically: intercept the sample to be evaluated so that its size meets the metallographic sample, then use metallographic sandpaper to grind sequentially, after polishing, immerse in the metallographic corrosion solution for corrosion , to obtain a metallographic sample.

[0031] Secondly, obtain the metallographic structure picture of the metallographic sample, specifically, a scanning electron microscope (SEM) or an optical microscope can be used to obtain the metallographic structure picture.

[0032] Then, calculate the area fraction of the precipitated phase according to the pixel difference of the precipitated phase in the metallographic structure diagram, and the area fraction of the precipitated phase ...

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Abstract

The invention discloses a T / P91 steel ageing rating method based on precipitated phase area fraction. The method comprises the following steps of: 1, intercepting a test sample to be evaluated, and preparing a metallographic phase test sample; 2, acquiring a metallographic phase tissue picture of the metallographic phase test sample; 3, calculating the precipitated phase area fraction according to the pixel difference of the precipitated phase in the metallographic phase tissue picture, wherein the metallographic phase tissue picture is the percentage of the precipitated phase particle area to the field-of-view total area; and 4, performing ageing rating on the test sample to be evaluated according to the precipitated phase area fraction. The invention provides a T / P91 steel ageing rating method with quantitative reaction, so that an intuitive evaluation parameter on ageing of T / P91 steel is provided for scientific research and process study personnel.

Description

[0001] technical field [0002] The invention belongs to the field of iron and steel material inspection, in particular to an aging rating method for T / P91 steel based on the area fraction of precipitated phases. Background technique [0003] T / P91 steel is widely used in thermal power plant supercritical and super (ultra) critical unit boiler pipe steel due to its good high temperature performance and relatively cheap price. T / P91 steel will age during long-term use , the service performance declines, and the aging process is accompanied by a series of changes in the precipitated phase. However, in the practice of evaluating the aging of T / P91 steel, technicians generally rely on experience to give a conclusion on the degree of aging, which is highly subjective and causes some confusion to relevant scientific research and technical personnel. At present, there is no more objective aging rating method for T / P91 steel. Contents of the invention [0004] The purpose of the...

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Application Information

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IPC IPC(8): G01N23/22G01Q60/18G01N1/32
Inventor 王志武宋涛
Owner WUHAN UNIV
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