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Method for analyzing component temperature state by using carbide phase component change

A technology of change analysis and carbide, applied in the direction of analysis of materials, material thermal analysis, instruments, etc., to achieve the effect of accurate service life

Inactive Publication Date: 2004-02-25
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, there are many indirect temperature measurement methods developed in the world, such as scale evaluation method and hardness evaluation method, but there is no method for evaluating the change of carbide phase composition.

Method used

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  • Method for analyzing component temperature state by using carbide phase component change
  • Method for analyzing component temperature state by using carbide phase component change

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select new materials of 102 steel and 12Cr1MoV steel, and pipe samples of different aging degrees obtained after actual use, and process them into simulated test samples.

[0014] The variable stress simulation test and the variable temperature simulation test under constant stress σ are carried out at a constant temperature T, and the test is stopped after a certain time of 100, 1000, 2000, 5000, and 10000 hours to obtain a set of simulation time t data.

[0015] The carbide phase composition analysis method was used to measure the content composition of carbide alloy elements Cr and Mo before and after each sample was used, and the difference ΔQ was given. Its data are shown in figure 1 , 2 .

[0016] The statistical method of polynomial regression analysis is used to analyze the law between the change of alloy elements in carbide and the test temperature and time. The test conditions are described by the temperature-time parameter LMP, and the statistical relations...

Embodiment 2

[0020] The superheater burst tube failure occurred in the boiler of Nantong Power Plant, and the actual use samples were taken from the high-temperature superheater and high-temperature reheater to analyze and evaluate their service status and residual life. The following table 1 shows the results of carbide phase structure analysis, and table 2 shows the temperature evaluation results (°C) according to the change of Cr content, compared with the results of other evaluation methods such as inner wall scale and hardness. It can be seen that the use of carbide phase composition analysis Compared with the average value of the actual temperature value of the component metal evaluated by this method, the error is relatively smaller than other methods.

[0021]

[0022] assessment method

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Abstract

The present invention relates to a method for analyzing carbide phase component variation by using component temp. state. It includes the following steps: firstly, adopting simulated booster testing machine or persistent strength testing machine to make acceleration test of simulated application condition for commonly-used materials of different power stations under the series temp. and stress toobtain different ageing time samples; adopting carbide phase chemical separation technique to make separation of Cr, Mo and V alloy elements of base body carbide phase in alloy of every sample and make content percentage determination of quantitative element components; and adopting regression analysis to analyze the law between the variation of alloy element in the carbide and test temp. and time, and said test adopts the describing mode of timp.-time parameter LMP.

Description

1. Technical field [0001] The invention relates to an indirect temperature state evaluation method for parts used in a power plant at high temperature, in particular to a method for analyzing the temperature state of the parts by carbide phase composition changes. 2. Background technology [0002] At present, the Cr-Mo and Cr-Mo-V steels commonly used in power plants will redistribute their alloy elements during long-term use, that is, the alloy elements in the matrix will transfer to the carbide phase, and there will also be elements between different types of carbides. The phenomenon of mutual transfer of phase composition, this change of phase composition content is also called phase composition transfer, which is one of the basic characteristics of the gradual aging of high-temperature metal materials in power plants. However, there are few studies on the basic laws of carbide phase composition changes. The relationship between the composition content change and the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01N33/20
Inventor 李耀君
Owner XIAN THERMAL POWER RES INST CO LTD
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