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Heat-resistant steel material residual life evaluation method

A technology for life evaluation and heat-resistant steel, applied in the field of heat-resistant steel materials, can solve the problems of insufficient detection reliability and accuracy

Pending Publication Date: 2019-07-12
HANGZHOU E ENERGY ELECTRIC POWER TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the commonly used detection methods for life prediction of in-service boiler materials are generally based on hardness test, room temperature and high temperature tensile performance test, scale test, carbide analysis, metallographic test and other means. In terms of test reliability and accuracy there are some deficiencies

Method used

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Experimental program
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Effect test

Embodiment 1

[0026] The samples were selected from the superheater of a 1000MW ultra-supercritical generator in a power plant, and the material was austenitic heat-resistant steel HR3C. The samples were taken to prepare a series of creep samples, respectively at 700°C and 0.5R p0.2 Tested under the conditions of 1000h, 2000h, 3000h, 4000h to the creep rupture of the sample, using the indentation method (1000mN) to test the indentation plastic work of the above samples respectively 1.335uJ, 1.255uJ, 1.185uJ, 1.105uJ, 1.050uJ , to establish the corresponding trend relationship between material life and plastic work: plastic work=1.405-0.000075*life (time), see figure 1 . The measured plastic work of the tested sample is 1.260uJ, figure 1 middle The position represents the remaining life of the sample, and the calculated remaining life is 2800h.

Embodiment 2

[0028] The samples are selected from the main steam valve of a gas turbine power plant, and the material is P91. Due to the large fluctuations in the operating temperature of the long-term peak-shaving unit, the life of the main steam valve's resistance to cold and heat fatigue is predicted. 200, 400, 600, 800 cycles at 550°C-100°C and fatigue cracking samples were tested by indentation method (300mN) respectively. The indentation plastic work of the above samples was 0.1240uJ, 0.1183uJ, 0.1135uJ respectively , 0.1055uJ, 0.0990uJ, establish the corresponding trend relationship between material life and plastic work, see figure 2 , plastic work=0.1311-0.000032*life (times).

[0029] Measure the plastic work of the tested sample to be 0.1110uJ, figure 2 middle The position represents the remaining life of the sample, and the calculated remaining life is 375 times.

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Abstract

The invention discloses a heat-resistant steel material residual life evaluation method. At present, a common detection means for service life prediction of an in-service boiler material has some defects in the aspects of detection reliability and accuracy. According to the method, the normal-temperature plastic work of the heat-resistant steel material is taken as a detection means, the normal-temperature plastic work in different degradation states until the service life of the material is ended is measured, and the corresponding relation between the plastic work and the service life of theheat-resistant steel material is established, so that the remaining service life of the heat-resistant steel material is predicted. The service life of the material is tracked through the plastic workindex, and the method has the advantage of being easy to quantify. The service life of the material is judged by establishing a corresponding trend relationship between the service life of the material and plastic work.

Description

technical field [0001] The invention belongs to the field of heat-resistant steel materials, in particular to a method for evaluating the remaining life of heat-resistant steel materials. Background technique [0002] In recent years, with the continuous increase of the installed capacity of ultra-supercritical (USC) units in various provinces and the gradual increase in the localization of key materials in the units, the metal supervision of new heat-resistant steels after the USC units are put into operation has become a new, issues that require urgent attention. However, since most domestically produced new heat-resistant steels have just come out, there is still a lack of data on their performance changes under service conditions in power plants, which makes it difficult to supervise their metals at this stage. Therefore, carrying out a comparative study on the degradation law and physical mechanism of the mechanical properties of new heat-resistant steels under service...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 郑宏晔周正强叶笃毅胡洁梓周宇通杨点中陈小林邹君文周桢张小菊徐强
Owner HANGZHOU E ENERGY ELECTRIC POWER TECH
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