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Superheated pipeline metallographic analysis method realized by using ultrasound under low load condition

A metallographic analysis, low-load technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and material analysis. It can solve problems such as inconvenient monitoring and achieve high environmental applicability. Effect

Pending Publication Date: 2021-09-28
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of inconvenient monitoring of the creep condition of existing high-temperature and high-pressure steam pipelines, and to provide a method for metallographic analysis of superheated pipelines under low-load conditions using ultrasound.

Method used

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  • Superheated pipeline metallographic analysis method realized by using ultrasound under low load condition
  • Superheated pipeline metallographic analysis method realized by using ultrasound under low load condition
  • Superheated pipeline metallographic analysis method realized by using ultrasound under low load condition

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specific Embodiment approach 1

[0017] Specific implementation mode 1: The method for metallographic analysis of superheated pipelines realized by ultrasound under low-load conditions in this implementation mode is specifically carried out according to the following steps:

[0018] 1. Clean the surface of the superheated pipeline to be tested, apply coupling agent, and then set the ultrasonic receiving probe and ultrasonic transmitting probe symmetrically at both ends of the diameter of the superheated pipeline to ensure that both the ultrasonic receiving probe and the ultrasonic transmitting probe are in contact with the coupling agent contact;

[0019] Two, the ultrasonic transmitting probe emits an ultrasonic pulse, which is received by the ultrasonic receiving probe; measure the acoustic time value T between the ultrasonic transmitting pulse and the receiving pulse and the sound path L between the ultrasonic transmitting pulse and the receiving pulse, by the formula V=L / T finds the ultrasonic sound velo...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the coupling agent in step 1 is carbomer resin. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the thickness of the coupling agent in step 1 is 0.05-0.2 mm. Others are the same as in the first or second embodiment.

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Abstract

The invention belongs to the technical field of thermal power generation, and particularly relates to an superheated pipeline metallographic analysis method achieved through ultrasound under the low-load condition. The invention aims to solve the problems that the creep condition of the existing high-temperature and high-pressure steam pipeline is inconvenient to monitor and the judgment of the creep damage is limited. The method comprises the following steps: measuring ultrasonic sound velocity by adopting a penetration method, taking an average value, representing the vermicularizing rate of the measured superheated pipeline through a formula, and monitoring the vermicularizing condition of the measured superheated pipeline. The method is used for metallographic analysis of the overheating pipeline under the low-load condition.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a metallographic analysis method for superheated pipelines realized by ultrasonic waves under low load conditions. Background technique [0002] The design life of thermal power plants is generally 30 years. Due to the long-term service under high overflow and high pressure conditions, the damage and deterioration of high-temperature key components of power plants such as high-temperature main steam pipes and main steam pipes are particularly serious. The monitoring of high humidity and high pressure metal parts and the assessment of remaining life are increasingly urgent. [0003] The main steam pipeline of a thermal power plant works under high temperature and high pressure conditions for a long time, which leads to intensified diffusion of atoms, and changes in its microstructure, such as: creep damage, creep holes, spheroidization, aggregation and...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/28
CPCG01N29/07G01N29/28
Inventor 束继伟王玉喜高凯盛玉和富学斌孙清民杜利梅马晶妍
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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