A high temperature strength prediction method for martensitic steel based on microstructure degradation

A microstructure and high-temperature strength technology, applied in the field of materials, can solve problems such as the development of high-temperature strength prediction methods that have not been considered, and achieve the effect of ensuring safe service

Active Publication Date: 2018-12-14
TIANJIN UNIV
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Problems solved by technology

However, due to the complexity of microstructure degradation caused by long-term high-temperature service and the time-consuming nature of high-temperature tests, no high-temperature strength prediction method based on microstructure degradation under high-temperature service conditions has been developed.

Method used

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  • A high temperature strength prediction method for martensitic steel based on microstructure degradation
  • A high temperature strength prediction method for martensitic steel based on microstructure degradation
  • A high temperature strength prediction method for martensitic steel based on microstructure degradation

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Embodiment 1

[0038] A method for predicting high temperature strength of martensitic steel based on microstructure degradation, comprising the following steps:

[0039] Step 1, select the new martensitic heat-resistant steel G115, and prepare a creep sample with a gauge length of 40mm and a diameter of 5mm as the research object;

[0040] Step 2, applying a stress of 140 MPa to the creep sample at 650° C. to obtain creep tests of the sample under different aging creep damage states;

[0041] Step 3, performing microscopic test technical characterization of the creep samples in different creep damage states obtained in step 2, and obtaining the microstructure parameters of the creep samples in different creep damage states, the microstructure parameters Including: the local misorientation between θ grains, the unit is rad; λ m The average width of the martensitic lath structure, in nm; N i The number density of the i-th precipitated phase, in μm -2The microscopic testing technology chara...

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Abstract

The invention discloses a high-temperature strength prediction method of martensitic steel / ferrite steel based on microstructure degradation, namely a high-temperature strength prediction model basedon microstructure degradation under high-temperature service conditions. Based on the contribution of different strengthening mechanisms to the yield strength, the key microstructure parameters of thematerial under high temperature service condition are introduced to calculate the high temperature yield strength with high temperature service damage state. The high-temperature strength predictionmethod based on microstructure degradation established by the invention can accurately predict the high-temperature strength of the high-temperature structure in long-term high-temperature service. Byincorporating the degradation of high temperature strength caused by microstructure degradation into the life assessment of high temperature structure, the service safety of high temperature structure can be further ensured, and the loss of life and property can be reduced.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for predicting high-temperature strength of martensitic steel based on microstructure degradation. Background technique [0002] The coal-based energy structure is one of the main causes of smog in my country, and coal-fired power generation is currently the most important power generation method in my country, and this trend will exist for a long time. Faced with the huge pressure of resource development and environmental protection in our country, ultra-supercritical units are currently the first choice for clean and efficient power generation by improving steam parameters and steam temperature. However, long-term high-temperature service will lead to the degradation of the microstructure of the material, which will greatly reduce the high-temperature strength of the material and seriously threaten the safe operation of the unit. In the service evaluatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/04G06F2119/08G06F30/20
Inventor 徐连勇肖博赵雷荆洪阳韩永典
Owner TIANJIN UNIV
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