Forecasting method of creep life of high-temperature material

Abstract

The invention belongs to the technical field of material science and engineering and relates to a forecasting method of the creep life of a high-temperature material. With the rise of working temperature, the probability of creep failure of high-temperature equipment and high-temperature mechanisms and the ponderance of accidents caused by the creep failure in modern industry are both increased greatly. The forecasting method of the creep life of the high-temperature material comprises the following steps of: acquiring data of material at different temperatures, wherein each test point comprises temperature, stress and fracture time; calculating the test data to obtain a P value that each test stress Sigma corresponds to according to a formula; conducting LH parametric method curvilinear regression to obtain a main curve of an LH regression curve, wherein the mathematical expression of the regression curve is lg Sigma=A0+AIP+A2P2+...; and calculating creep life under different temperatures and stress conditions on the regression curve. The invention has the advantages of improving the forecasting precision of the creep life of the material and the reliability of life assessment and having wide application range and simple forecasting method.

Description

technical field [0001] The invention belongs to material science and engineering application technology, in particular to a creep life prediction method of high-temperature materials. Background technique [0002] In order to improve efficiency, reduce cost, save energy and reduce pollution, modern industry is constantly increasing the working temperature. For example, in the early coal-fired power generation, the working temperature was only about 400°C, the efficiency was less than 30%, and the coal consumption exceeded 450 g / kWh. However, the modern supercritical thermal power generation has an operating temperature of over 600°C, the efficiency exceeds 40%, and the coal consumption drops to 300. Below gram / degree, the social and economic benefits are remarkable. In addition to the thermal power industry, in petrochemical, nuclear power, aerospace, and emerging microelectronics industries, the same working temperature is also increasing. In the petrochemical industry, t...

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Problems solved by technology

For example, under creep conditions, the loss of outer section and the nucleation and growth of creep voids occur simultaneously. For most heat-resistant alloys, the loss of outer section and the damage of creep voids also occur at the same time as the coarsening of second phase particles. Deterioration, that is, there is a certain gap between the calculation model and the actual creep rupture microstructure, and the creep life of high-temperature materials cannot be accurately predicted

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