High-temperature creep property testing method based on section-variable test sample

Abstract

The invention relates to a high-temperature creep property testing method based on a section-variable test sample. The high-temperature creep property testing method comprises the following steps: spraying high-temperature paint on the surface of a section-variable test sample in advance to form speckles; then putting the section-variable test sample into a heating furnace with a view window; arranging an illumination light source for illuminating the section-variable test sample and a camera for photographing the section-variable test sample on an outer side of the heating furnace; applying a certain fixed load P to two clamping ends of the section-variable test sample; carrying out continuous observation and photographing on a speckle pattern on the surface of the section-variable test sample through the camera; and finally, inputting the speckle pattern on the surface of the test sample, which is photographed by the camera, into a processing device, and obtaining full-field deformation of the surface of the section-variable test sample in a high-temperature creep testing process through computer image processing. The high-temperature creep property testing method has the advantages of high testing efficiency, good precision, low cost and the like; and a lot of data results under different stress level conditions can be obtained through one time of testing, so that time and cost for a high-temperature creep test are effectively saved.

Description

technical field [0001] The invention belongs to the field of creep performance testing of metal materials, and in particular relates to a high-temperature creep performance testing method based on variable-section samples. Background technique [0002] In recent years, with the development of the national economy and industrial technology, a large number of high-temperature equipment has been used in pillar industries such as petrochemical, electric power, energy, and metallurgy. With the upgrading of the process technology in the future, there will be more equipment serving at higher temperatures. For example, the operating temperature of boilers and pipes for the next generation of ultra-supercritical power generation units will reach 700°C, and the operating temperature of fluidized beds in the petrochemical and oil refining industry will also reach 650°C. The equipment serving at these high temperatures will inevitably have creep problems. However, the current creep-ba...

AI Technical Summary

Problems solved by technology

However, the current creep-based high-temperature strength design method in my country is not perfect, and the long-term creep performance of domestic metal materials, especially new materials, is extremely scarce, which seriously restricts the design, manufacture and localization of high-temperature equipment in China.

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