Evaluation method for predicting remaining creep rupture life of supercritical unit T/P91 heat-resistant steel based on room temperature Brinell hardness

Abstract

The invention relates to the field of evaluation of the remaining creep rupture life of iron and steel materials, particularly to an evaluation method for predicting the remaining creep rupture life of a supercritical unit T/P91 heat-resistant steel based on room temperature Brinell hardness. According to the present invention, the corresponding relationship between the creep rupture life and theroom temperature Brinell hardness HB in different aging states is established by using the high-temperature tensile strength of the material as the bridge so as to establish the mathematical analysisof the relationship between the room temperature Brinell hardness and the creep rupture life at the given temperature under the given stress; and the remaining creep rupture life of the current material under the specific steam parameter can be rapidly and accurately predicted through the simple, convenient and non-destructive hardness test, such that the economic loss caused by shutdown or pipeline cutting and the like can be directly eliminated, and the remaining creep rupture life of the material can be timely evaluated due to the convenience and the rapidness so as to effectively prevent the accident caused by the aging failure.

Description

technical field [0001] The invention relates to the field of evaluation of the remaining enduring life of steel materials, in particular to a method for evaluating the remaining enduring life of T / P91 heat-resistant steel of a supercritical unit based on Brinell hardness prediction at room temperature. Background technique [0002] Based on safety and economic considerations, the evaluation of high-temperature creep life has always been an important topic in the research and development of heat-resistant steels. Metal materials operating under actual conditions are often subject to little stress and low temperature. Experiments under such conditions can directly obtain the service life under service conditions, but it takes a lot of time, sometimes several years , even ten years. In order to shorten the time, the experimental stress or temperature must be increased, that is, the accelerated experimental method is used, and then the remaining life under the service condition...

AI Technical Summary

Problems solved by technology

The disadvantages are: it is necessary to conduct destructive experiments on components, which is time-consuming and laborious; when obvious cavities and microcracks appear in components, it is difficult to measure accurate experimental data; it is affected by chemical composition, microstructure and operating conditions. Due to the influence of inhomogeneity, the dispersion of experimental data is large; for a new material, a large number of experiments are required to determine the C value, and the C value is related to stress

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