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

Abstract

The invention relates to a device for simultaneously realizing high-temperature steam oxidation and stress corrosion cracking tests. A heating furnace (2) controls the temperature, a tensile machine loads a sample (4), and at the same time, all the high-temperature steam flows into the heating furnace (2). Inside, a high-temperature steam oxidative corrosion environment is provided, and another high-temperature steam sprays the sample (4) through the steam nozzle (7), so that the sample (4) is completely in a high-temperature steam atmosphere, and the constant current source (25) is the sample (4) Direct current is supplied, and a nanovoltmeter (26) collects a voltage drop signal generated by crack propagation at the incision, and transmits it to a computer (27) for processing. The invention can be used to simultaneously realize high temperature steam oxidation and stress corrosion cracking test, to study the effect of high temperature steam oxidation corrosion and stress on the crack propagation performance of materials, so as to accurately reveal the performance evolution law of materials in service stage.

Description

technical field [0001] The invention belongs to the technical field of metal material cracking test, and particularly relates to a device and method for simultaneously realizing high-temperature steam oxidation and stress corrosion cracking test. Background technique [0002] The main way to improve the power generation efficiency of thermal power units is to improve 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 long-term service 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 long served in flowing supercritical water and are subject to complex working stress. High-temperature water vapor can cause oxidative corrosion of metal materials, and stress can increase the rate of oxidative corros...

AI Technical Summary

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.

Images