High-temperature high-pressure wedge-shaped expansion load presplitting grain stress corrosion test device

Abstract

The invention discloses a high-temperature high-pressure wedge-shaped expansion load presplitting grain stress corrosion test device which is characterized by being composed of a high-temperature high-pressure container, a sealing wire joint, a data acquisition box, a temperature controller and an industrial computer, wherein the high-temperature high-pressure container is a closed container with a jacket structure, and the closed container is formed by welding steel plates; conduction oil is filled in the jacket; aiming at the conduction oil, an electric heater is arranged; the top cover of the closed container is a flange cover; the flange cover is provided with the sealing wire joint and respectively provided with a temperature sensor and a pressure transmitter; a sample holder for placing a WOL sample is arranged in the closed container; the sealing wire joint is used for guiding a strain gauge signal on the WOL sample out of the closed container; and the industrial computer controls the internal temperature and pressure ranges of the closed container. The device disclosed by the invention can be used in a high-temperature environment of a simulated field and can be used for continuously performing a stress corrosion test.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure wedge-shaped opening loading (WOL) pre-crack stress corrosion test device, which is used for high-temperature and high-pressure stress corrosion tests of various high-strength steels and for measuring the sensitivity of stress corrosion cracks of steel for pressure vessels. Background technique [0002] With the development of science and technology, pressure vessels are showing a trend of large-scale and high-parameter development. If ordinary low-strength steel is used to manufacture large-scale reactors, the wall of the vessel will be too thick and the total mass will be too large, which will be difficult for manufacturing and transportation. It is difficult to install and install, and it also increases the comprehensive investment. For this reason, a large number of low-alloy high-strength steels are used to manufacture large vessels. However, the extensive use of low-alloy high-strengt...

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Problems solved by technology

[0003] The stress corrosion crack growth rate of high-strength steel in corrosive medium is the main index to measure whether the steel can be used safely in chemical equipment. Part 6: Preparation and Application of Pre-cracked Specimens under Constant Load or Constant Displacement" is determined by the test method specified in the standard; the load applied in the test is generally determined by the relationship between the calibrated bolt load and the opening displacement of the knife edge. A small change in the opening displacement corresponds to a large fluctuation in the load, and it is very difficult to accurately measure the opening displacement of the knife edge; moreover, this measurement method needs to take the sample out of the test environment for measurement, which leads to fluctuations in the test process. Interruption, affecting test results

For the high temperature and high pressure test environment, the process of measuring the opening displacement of the knife edge will be very troublesome, and the process is also very long; therefore, a method of directly measuring the bolt load is needed, and at the same time, the simulation of the high temperature and high pressure medium environment requires a complete set of medium heating , parameter measurement and safety protection, etc., but there is no public report of related technology in the prior art

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