Method for obtaining reoxidized analysis sample in steam service environment

A technology of service environment and acquisition method, which is applied in the field of obtaining samples for reoxidation analysis under steam service environment, can solve the problems of difficult realization and high cost.

Inactive Publication Date: 2017-12-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The realization of both is very difficult and costly

Method used

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  • Method for obtaining reoxidized analysis sample in steam service environment
  • Method for obtaining reoxidized analysis sample in steam service environment
  • Method for obtaining reoxidized analysis sample in steam service environment

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Embodiment 1

[0027] Research question: After the material super304H is exposed to 600°C, 20MPa steam environment, the creep stress level is 105MPa, and the creep damage degree is 50% (corresponding to about 50,000 hours of operation time), the peeling of the primary scale surface layer is related to steam reoxidation oxidation mechanism.

[0028] According to the requirements of the creep machine, make sample 4 and a comparison sample of the same size and shape, such as Figure 5 shown.

[0029] The methods for obtaining reoxidation analysis samples under steam service environment are as follows:

[0030] 1) High temperature and high pressure reactor such as figure 1 a- figure 1 As shown in b, firstly, in the high-temperature and high-pressure reactor, use oxygen and high-temperature H 2 O steam for steam oxidation of sample 4. Oxygen simulated oxidation is a widely used method for simulating steam oxidation by accelerating oxidation. The amount of oxygen added is determined accordin...

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Abstract

The invention discloses a method for obtaining a reoxidized analysis sample in a steam service environment. The method comprises the following steps: 1) performing steam oxidation on a material by water steam to obtain a primarily oxidized sample; 2) adopting mechanical cutting, grinding or electric spark cutting according to requirements of simulation analysis to remove a part of or all of a surface oxide layer in order to simulate different oxide layer exfoliation conditions; 3) carrying out high temperature creep loading on the processed material obtained in step 2) in a protective gas environment; and 4) carrying out water steam oxidation on the processed material obtained in step 3) again to obtain the reoxidized analysis sample in the simulated steam service environment, wherein H2O steam is adopted in the step 1) and heavy-oxygen water (H2<18>O) steam is adopted in step 4) in order to distinguish the double oxidized product.

Description

technical field [0001] The invention belongs to the technical field of material oxidation resistance evaluation, in particular to a method for obtaining reoxidation analysis samples in a steam service environment. Background technique [0002] In the high temperature and high pressure steam oxidation service environment of nuclear power and thermal power equipment, the evaluation of the oxidation resistance of materials is essential. Traditional laboratory analysis usually uses a single oxidation method for the original material. However, in the actual process, the cycle process of "scale growth-peeling-secondary scale regrowth" is a common phenomenon in the service process of such high-temperature components. Single scale analysis results are valid for primary scale growth only. Therefore, it is necessary to study the law of secondary scale regrowth in order to reveal the oxidation mechanism of the whole process of component life. [0003] The difference between the grow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N3/18G01N1/28
CPCG01N1/28G01N3/18G01N17/00
Inventor 毛雪平倪永中张乃强徐鸿田思达吴红良任云丰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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