Method and system for evaluating creep damage of high temperature component

Abstract

The invention provides a method and system for evaluating creep damage of a high temperature component. For components composed of heat-resisting steel and heat-resisting alloy, used at high temperature and damaged by creeping, the provided method for evaluating creep damage corresponds to stress multiaxiality and other stress states of components, so that the precision of residual service life evaluation and damage evaluation can be improved. The method for evaluating creep damage of a high temperature component for use under a high temperature environment is characterized in that temporal change in damage parameter of the high temperature component under a uniaxial condition and temporal change in multiaxiality of the high temperature component are obtained, and the temporal change in damage parameter is corrected by the temporal change in multiaxiality to assess the degree of creep damage of the high temperature component.

Description

technical field [0001] The present invention relates to structural materials used in high-speed neutron furnaces or complete sets of thermal power generation equipment, etc., and relates to a creep damage evaluation method and damage evaluation system for high-temperature components used in high-temperature regions above hundreds of degrees and subjected to damage caused by creep . Background technique [0002] Heat-resistant steels or heat-resistant alloys are used for parts that constitute high-speed neutron furnaces or thermal power plants, where the temperature during operation reaches hundreds of degrees or more. These materials are damaged by creep, creep fatigue, embrittlement, etc. due to continuous load at high temperature for a long time, and the life is determined by the degree of damage. The degree of damage varies depending on temperature, stress, environment, etc. Therefore, even for parts of the same design, the degree of damage and life differ according to t...

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Problems solved by technology

[0014] However, there is a problem that the relationship between multiaxiality and damage is not linear in many cases

In addition, in the actual structure, the stress multiaxiality becomes high in the parts where the stress concentration occurs such as notches, and the parts such as the heat-affected zone of welding are locally softened compared with the surrounding area. However, the multiaxiality of these parts varies with Changes with time, therefore, there is also a problem that the shape of the damage growth curve changes according to the load conditions, etc.

[0015] The multiaxiality is obtained by structural analysis, so a test body that reproduces the multiaxiality is generated, and the correction coefficient for damage values ​​such as the A parameter can also be directly obtained through the creep test. However, the multiaxiality increases with time. and changes, and high-temperature equipment is generally used for several years to decades, it is difficult to carry out corresponding tests many times

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