Device and method for realizing high-temperature steam oxidation and stress corrosion cracking tests simultaneously

Abstract

The invention relates to a device for realizing high-temperature steam oxidation and stress corrosion cracking tests simultaneously. A heating furnace (2) controls temperature, a stretcher applies load for a specimen (4), meanwhile, one way of high-temperature steam is introduced into the heating furnace (2) to provide a high-temperature steam oxidation corrosion environment, another way of high-temperature steam is sprayed to the specimen (4) through a steam spray pipe (7), so that the specimen (4) is in a high-temperature steam atmosphere completely, a constant current source (25) feeds direct current to the specimen (4), a nanovoltmeter (26) collects voltage drop signals generated through crack propagation at a notch and transmits the signals to a computer (27) for processing. The device can be used for realizing the high-temperature steam oxidation and stress corrosion cracking tests simultaneously, and the influence of joint action of high-temperature steam oxidation corrosion and stress on the crack propagation performance of a material is researched, so that the performance evolution law of the material in a service stage is revealed accurately.

Description

technical field [0001] The invention belongs to the technical field of metal material cracking tests, in particular to a device and method for simultaneously realizing high-temperature steam oxidation and stress corrosion cracking tests. Background technique [0002] The main way to improve the power generation efficiency of thermal power units is to increase the main steam parameters. The high-temperature performance of metal materials is the primary problem that restricts the development of high-parameter and large-capacity units. The reliability and stability of key structural materials of thermal power plants in supercritical water environment are important factors affecting the safety and economy of units. Metal materials have served in flowing supercritical water for a long time and are subjected to complex working stress. High-temperature water vapor will cause oxidation and corrosion of metal materials, and stress can increase the rate of oxidation and corrosion. At...

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Problems solved by technology

At present, the existing research methods in this field can only consider the influence of a single factor, such as high-temperature steam oxidation corrosion performance or high-temperature mechanical properties, which leads to the fact that the existing methods cannot truly reflect the high-temperature performance evolution process of the material, and thus cannot correctly evaluate its remaining life.

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