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CN-121994611-A - High-temperature high-pressure stress corrosion device and test method for c-shaped ring sample

CN121994611ACN 121994611 ACN121994611 ACN 121994611ACN-121994611-A

Abstract

The invention relates to the technical field of stress corrosion test equipment, in particular to a high-temperature high-pressure stress corrosion device and a testing method for a C-shaped ring sample, wherein the device comprises an integral bracket; the pressure-bearing test pool body is arranged on the integral support, the pressure-bearing test pool body is provided with a containing cavity for containing corrosive media and C-shaped ring samples, the pressure-bearing test pool body is provided with a stress loading mechanism, the stress loading mechanism penetrates into the pressure-bearing test pool body and bears the C-shaped ring samples and applies stress load to the C-shaped ring samples, the pressure-bearing test pool body is provided with an environment simulation system for simulating actual temperature and pressure conditions of the C-shaped ring samples, the environment simulation system comprises a heating unit, the heating unit comprises a plurality of titanium alloy heating rods, each titanium alloy heating rod is inserted into the pressure-bearing test pool body, the titanium alloy heating rods are connected with an external temperature controller, the pressurizing unit comprises a gas cylinder, a metal corrugated hose, a pressure reducing valve and a precision pressure gauge, and the potential monitoring unit.

Inventors

  • XU LEI
  • CHEN JIAXIN
  • XU YIJIE
  • BAO SHIYI

Assignees

  • 浙江工业大学

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The high-temperature high-pressure stress corrosion device for the c-shaped ring sample is characterized by comprising an integral bracket (1); The pressure-bearing test pool body (2) is arranged on the integral bracket (1), and the pressure-bearing test pool body (2) is provided with a containing cavity for containing corrosive medium and C-shaped ring samples (3); the pressure-bearing test pool comprises a pressure-bearing test pool main body (2), wherein a stress loading mechanism is arranged on the pressure-bearing test pool main body (2), and part of the stress loading mechanism penetrates into the pressure-bearing test pool main body (2) and bears a C-shaped ring sample (3) and applies stress load to the C-shaped ring sample (3); The environment simulation system is configured on the pressure-bearing test pool main body (2) and is used for heating and pressurizing the corrosive medium in the pressure-bearing test pool main body (2) so as to simulate the actual temperature and pressure working conditions of the C-shaped ring sample (3); the environment simulation system includes: the heating unit comprises a plurality of titanium alloy heating rods (4), each titanium alloy heating rod (4) is inserted into the pressure-bearing test pool main body (2), and the titanium alloy heating rods (4) are connected with an external temperature controller; The pressurizing unit comprises a gas cylinder (5), a metal corrugated hose, a pressure reducing valve (6) and a precision pressure gauge (7), wherein the metal corrugated hose is connected with an outlet of the gas cylinder (5) and the pressure-bearing test pool main body (2), and the pressure reducing valve (6) and the precision pressure gauge (7) are both arranged on the metal corrugated hose; The potential monitoring unit comprises an electrode lead connected to the C-shaped ring sample (3), and the electrode lead is connected with a power supply (24) and a potential acquisition unit (25); the stress monitoring unit comprises a strain gauge arranged on the stress loading mechanism and a stress monitoring unit (26) arranged outside the pressure-bearing test pool main body (2) and electrically connected with the strain gauge.
  2. 2. The high-temperature high-pressure stress corrosion device for the c-shaped ring sample according to claim 1, wherein an upper flange sealing cover is arranged at the upper end of the pressure-bearing test tank main body (2) and is used for sealing the upper end of the pressure-bearing test tank main body (2), The upper flange sealing cover (8) is provided with a temperature measuring interface (10), a pressure gauge interface (11) and a pressurizing interface (12), and the upper flange sealing cover (8) is provided with a plurality of heating rod interfaces.
  3. 3. The high-temperature high-pressure stress corrosion device for C-shaped ring samples according to claim 2, wherein the stress loading mechanism comprises an upper connecting plunger (13) arranged on the upper flange sealing cover (8), a mounting seat (14) is arranged at the lower end of the upper connecting plunger (13), the mounting seat (14) is used for accommodating and placing the C-shaped ring samples (3), and the upper connecting plunger (13) is configured to apply and maintain stress load on the C-shaped ring samples (3).
  4. 4. The device for corrosion of C-shaped ring samples under high temperature and high pressure as set forth in claim 3, wherein the mounting base (14) comprises a vertical plate (141), an upper connecting plate (142) and a lower mounting plate (143) which are arranged at two ends of the vertical plate (141) in an up-down opposite mode, the lower mounting plate (143) is used for placing the C-shaped ring samples (3), a loading shaft (15) is arranged at the lower end of the upper connecting plunger (13), the loading shaft (15) passes through the upper connecting plate (142) downwards and is provided with a clamp (16), and the mounting base (14) and the clamp (16) are configured to be capable of lifting and fixing on the loading shaft (15).
  5. 5. The device for corrosion of C-shaped ring specimen under high temperature and high pressure as set forth in claim 4, wherein the clamp (16) is an expanding clamp (161) or a tightening clamp (162), the expanding clamp (161) has a triangular cone shape protruding outwards for propping against the inner side of the opening of the C-shaped ring specimen (3) through the tip of the triangular cone shape so as to prop open the opening of the C-shaped ring specimen (3), and the tightening clamp (162) has a groove formed by recessing inwards and propping against the peripheral wall of the C-shaped ring specimen (3) through the wall of the groove so as to close the opening of the C-shaped ring specimen (3).
  6. 6. The high-temperature high-pressure stress corrosion device for C-shaped ring samples according to claim 5, wherein the vertical plate (141) and the lower mounting plate (143) are provided with open grooves (17) for placing the C-shaped ring samples (3).
  7. 7. A high temperature and high pressure stress corrosion device for c-ring samples as claimed in claim 4, wherein a first sealing member (18) is arranged between the upper connecting plunger (13) and the upper flange sealing cover (8).
  8. 8. The high-temperature high-pressure stress corrosion device for the c-shaped ring sample according to claim 4, wherein a quick-release structure is arranged between the loading shaft (15) and the upper connecting plunger (13), and the quick-release structure comprises at least one of a threaded connection structure, a quick-buckle connection structure, a flange and a pin hole locking structure.
  9. 9. The high-temperature high-pressure stress corrosion device for the c-shaped ring sample according to claim 2, wherein the pressure-bearing test cell main body (2) is cylindrical, and flange interfaces are arranged at two ends of the pressure-bearing test cell main body.
  10. 10. A C-type ring stress corrosion test method is characterized by comprising the test device according to any one of claims 1-9, and comprises the following steps: s1, sample preparation and identification; s2, electrode arrangement and electrical connection preparation; S3, pre-stress loading; s4, pond loading and sealing assembly; S5, heating, pressurizing and establishing a steady state; S6, constant current excitation and potential difference on-line monitoring; s7, crack initiation/expansion judgment and alarm logic determination; s8, ending the test, releasing pressure, reducing temperature and sampling; S9, data arrangement and result output.

Description

High-temperature high-pressure stress corrosion device and test method for c-shaped ring sample Technical Field The invention relates to the technical field of stress corrosion test equipment, in particular to a high-temperature high-pressure stress corrosion device and a testing method for a c-shaped ring sample. Background Stress Corrosion Cracking (SCC) is a form of concealed and highly compromised failure of metallic materials under the combined action of stress and specific corrosive environments, often resulting in sudden fracture of the equipment at stresses well below the yield strength of the material. In order to evaluate the SCC sensitivity of materials, C-ring samples are widely used as a standard sample, and are very typical on pipe materials and bar samples, which are difficult to sample. Many industrial equipment (e.g., pipelines, heat exchangers in petrochemical, nuclear power applications) are subjected to high temperatures and pressures in actual service. The experiment at normal temperature and pressure cannot simulate the influence of pressure on the physicochemical properties of the corrosive medium, so that the experimental result deviates from the actual service behavior, and the SCC resistance of the material under the severe working condition cannot be truly reflected, so that the C-type ring stress corrosion testing device capable of simulating the high-temperature high-pressure working condition is urgently needed in the field. Disclosure of Invention Accordingly, in view of the above-mentioned problems, the present invention provides a high-temperature high-pressure stress corrosion device and a testing method for a c-type ring sample. The invention is realized by the following technical scheme: The device for testing the C-shaped ring sample under pressure stress corrosion at a temperature comprises an integral bracket; The pressure-bearing test pool body is arranged on the integral bracket and is provided with a containing cavity for containing corrosive medium and C-shaped ring samples; the pressure-bearing test pool body is provided with a stress loading mechanism, and the stress loading mechanism part penetrates into the pressure-bearing test pool body and bears a C-shaped ring sample and applies stress load to the C-shaped ring sample; The environment simulation system is configured on the pressure-bearing test tank main body and is used for heating and pressurizing the corrosive medium in the pressure-bearing test tank main body so as to simulate the actual temperature and pressure working conditions of the C-shaped ring sample; the environment simulation system includes: the heating unit comprises a plurality of titanium alloy heating rods, each titanium alloy heating rod is inserted into the pressure-bearing test pool main body, and the titanium alloy heating rods are connected with an external temperature controller; The pressurizing unit comprises a gas cylinder, a metal corrugated hose, a pressure reducing valve and a precise pressure gauge, wherein the metal corrugated hose is connected with an outlet of the gas cylinder and the pressure-bearing test pool main body, and the pressure reducing valve and the precise pressure gauge are both arranged on the metal corrugated hose; the potential monitoring unit comprises an electrode lead connected to the C-shaped ring sample, and the electrode lead is connected with a power supply and a potential acquisition unit; The stress monitoring unit comprises a strain gauge arranged on the stress loading mechanism and a stress monitoring unit arranged outside the pressure-bearing test cell body and electrically connected with the strain gauge. As a further improvement of the invention, the upper end of the pressure-bearing test tank main body is provided with an upper flange sealing cover for sealing the upper end of the pressure-bearing test tank main body, the upper flange sealing cover is provided with a temperature measuring interface, a pressure gauge interface and a pressurizing interface, and the upper flange sealing cover is provided with a plurality of heating rod interfaces. As a further improvement of the invention, the stress loading mechanism comprises an upper connecting plunger arranged on the upper flange sealing cover, wherein the lower end of the upper connecting plunger is provided with a mounting seat which is used for accommodating and placing the C-shaped ring sample, and the upper connecting plunger is configured to apply and maintain a stress load on the C-shaped ring sample. The mounting seat comprises a vertical plate, an upper connecting plate and a lower mounting plate which are arranged at two ends of the vertical plate in an up-down opposite mode, wherein the lower mounting plate is used for placing a C-shaped ring sample, a loading shaft is arranged at the lower end of the upper connecting plunger, the loading shaft passes through the upper connecting plate downwards and is provided with a clamp, and