CN102944482A - High-temperature high-pressure wedge-shaped expansion load presplitting grain stress corrosion test device - Google Patents
High-temperature high-pressure wedge-shaped expansion load presplitting grain stress corrosion test device Download PDFInfo
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- CN102944482A CN102944482A CN2012104539093A CN201210453909A CN102944482A CN 102944482 A CN102944482 A CN 102944482A CN 2012104539093 A CN2012104539093 A CN 2012104539093A CN 201210453909 A CN201210453909 A CN 201210453909A CN 102944482 A CN102944482 A CN 102944482A
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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
The present invention relates to a kind of High Temperature High Pressure wedge shape and open the pre-crackle stress corrosion testing device of loading (WOL), be used for carrying out the High Temperature High Pressure stress corrosion (cracking) test of various plow-steels, the stress corrosion cracking (SCC) susceptibility that is used for steels for pressure vessel use is measured.
Background technology
Along with the development of science and technology, pressure vessel presents to the trend of maximization, high parameter future development, if adopt general Medium And Low Strength Steels to make large-scale reactor, to cause chamber wall too thick, gross mass is excessive, causes difficulty for manufacturing, transportation and installation, and the comprehensive method of investment is increased.For this reason, adopt in a large number Hi-Stren steel to make tun.Yet, adopt in a large number Hi-Stren steel also to bring many application problems, such as the stress corrosion problem in the sensitive media.Stress corrosion refers to the rupture process of material that produced by unrelieved stress or applied stress and corrosion synergy, and the material cracking that this process causes is called stress corrosion crack (Stress Corrosion Cracking, SCC).Stress corrosion phenomena often occurs in the equipment of the enterprises such as chemical industry, oil refining and pipeline.Stress corrosion crack is one of maximum etch state of harm, often causes the stress brittle failure, is a kind of catastrophic corrosion.Very harmful such as blast of aviation accident, bridge breaking, Oil/Gas Pipe etc.Austenitic stainless steel, aldary, titanium alloy and the plow-steel of commonly using on the engineering and high-strength aluminum alloy etc., the counter stress corrosion is all very sensitive.In petroleum chemical industry, mainly concentrate on common wet H for the stress corrosion of plow-steel research
2The S environment with contain O
2And CO
2The liquefied ammonia environment in the aspects such as stress corrosion crack, the stress corrosion crack problem of Hi-Stren steel in high-temperature boiler water do not cause enough attention.
The stress corrosion cracking (SCC) expansion rate of plow-steel in corrosive medium is to weigh the leading indicator whether this steel grade can be used safely in chemical plant, and this numerical value generally adopts the test method of stipulating in GB/T 15970.6-2007 " corrosion stress corrosion test the 6th part of metal and alloy: preparation and the application of pre-crackle sample under constant load or the permanent displacement " standard to measure; Added load generally adopts the relation of demarcating bolt load and edge of a knife opening displacement to determine in the test and since the subtle change of edge of a knife opening displacement corresponding be the fluctuation of load, and the accurate measurement of edge of a knife opening displacement is very difficult; And this measuring method need to take out sample and measure from experimental enviroment, thereby causes the interruption of process of the test, affects test findings.For the experimental enviroment of High Temperature High Pressure, the process of measuring edge of a knife opening displacement will extremely bother, and process is also very very long; Therefore the mode that needs a kind of direct measurement bolt load, simultaneously, the system that the simulation of high-temperature high-pressure medium environment needs a cover complete dielectric heating, parameter measurement and security protection etc. to form still, does not have the open report of correlation technique in the prior art.
Summary of the invention
The present invention is for avoiding the existing weak point of above-mentioned prior art, provide a kind of High Temperature High Pressure wedge shape to open and load pre-crackle stress corrosion testing device, be used for the simulated field hot environment, carry out continuously stress corrosion (cracking) test, with the precision of raising test and the reliability of test findings.
The present invention is that the technical solution problem adopts following technical scheme:
It is to be made of high temperature and high pressure containers, sealing wire joint, data acquisition device, temperature controller and industrial computer that High Temperature High Pressure wedge shape of the present invention is opened the design feature that loads pre-crackle stress corrosion testing device;
Described high temperature and high pressure containers is to have a jacket structured closed container by what Plate Welding formed, is filled with conduction oil in the chuck, for conduction oil electric heating device is set; The top cover of described closed container is set to blind flange, at described blind flange the sealing wire joint is installed, and difference set temperature sensor, safety valve, tensimeter and pressure unit; Be provided for placing the specimen mounting of WOL sample in described closed container inside; With described sealing wire joint the foil gauge signal on the described WOL sample is drawn closed container;
Described data acquisition device is used for receiving respectively the foil gauge signal of being drawn by described sealing wire joint and the pressure signal that is detected the closed container that obtains by pressure unit;
The described industrial computer strain signal that real-time receive data vasculum sends after on-test, and be translated into the load value that calculates for crack growth rate; Described industrial computer also receives the temperature sensor detection signal that temperature controller passes over by serial communication interface; The temperature and pressure scope that is used for the control closed container by described industrial computer output control signal.
High Temperature High Pressure wedge shape of the present invention is opened the design feature that loads pre-crackle stress corrosion testing device and is that also described sealing wire joint is to be processed into hollow plunger with carbon steel rod, in the inner chamber of hollow plunger, fill the CPS cupric oxide inorganic adhesive and form sealing, top cover at hollow plunger is offered fairlead, signal lead connects agent by high-temp glue and is cemented in the inner chamber, and draw from fairlead, copper backing is set to guarantee sealing property between sealing wire joint and blind flange.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, setting of the present invention has a jacket structured closed container by what Plate Welding formed, can realize the WOL stress corrosion (cracking) test under the high temperature and high pressure environment.
2, the present invention arranges the sealing wire joint foil gauge information is drawn, and can realize the continuous coverage of test load, guarantees the reliability of test figure.
3, the present invention adopts industrial computer to come the Control experiment process, realizes the real time record of the information such as load, temperature, pressure in the process of the test.Be very easy to and utilize test findings that test figure is analyzed.
Description of drawings
Fig. 1 is that pilot system of the present invention consists of schematic diagram;
Fig. 2 a is lead-in wire seal joint structure schematic diagram among the present invention;
Fig. 2 b be among the present invention the lead-in wire sealing adaptor on the fairlead schematic diagram;
Number in the figure: 1 closed container; 2 conduction oils; 3 electric heating devices; 4 blind flanges; 5 sealing wire joints; The 5a fairlead; 5b is the CPS cupric oxide inorganic adhesive; 6 temperature sensors; 7 safety valve; 8 tensimeters; 9 pressure units; 10 specimen mountings; 11 is the WOL sample.
Embodiment
Referring to Fig. 1, the High Temperature High Pressure wedge shape opens that to load pre-crackle stress corrosion testing device be to be made of high temperature and high pressure containers, sealing wire joint, data acquisition device, temperature controller and industrial computer in the present embodiment;
High temperature and high pressure containers is to have a jacket structured closed container 1 by what Plate Welding formed, is filled with conduction oil 2 in the chuck, for conduction oil 2 electric heating device 3 is set; The top cover of closed container 1 is set to blind flange 4, at blind flange 4 sealing wire joint 5 is installed, and difference set temperature sensor 6, safety valve 7, tensimeter 8 and pressure unit 9; Be provided for placing the specimen mounting 10 of WOL sample 11 in closed container inside; With sealing wire joint 5 the foil gauge signal on the WOL sample is drawn closed container;
Data acquisition device is used for receiving respectively the foil gauge signal of being drawn by the sealing wire joint and is detected pressure signal in the closed container 1 that obtains by pressure unit;
The industrial computer strain signal that real-time receive data vasculum sends after on-test, and be translated into the load value that calculates for crack growth rate; Industrial computer also receives the temperature sensor detection signal that temperature controller passes over by serial communication interface; The temperature and pressure scope that is used for the control closed container by industrial computer output control signal.
Shown in Fig. 2 a and Fig. 2 b, sealing wire joint 5 is to be processed into hollow plunger with carbon steel rod in the present embodiment, in the inner chamber of hollow plunger, fill CPS cupric oxide inorganic adhesive 5b and form sealing, offer fairlead 5a at the top cover of hollow plunger, signal lead connects agent by high-temp glue and is cemented in the inner chamber, and draw from fairlead, copper backing is set to guarantee sealing property between sealing wire joint and blind flange.
High temperature and high pressure containers in the present embodiment refers to that it is the working environment of 4MPa with pressure that temperature is 250 ℃.
Process of the test:
1, makes the WOL sample with precrack by GB/T 15970.6-2007 " corrosion stress corrosion test the 6th part of metal and alloy: preparation and the application of pre-crackle sample under constant load or the permanent displacement " in advance, the dynamometry bolt is installed and is pasted foil gauge, utilize tension tester to load, added initial load is to measure by foil gauge, data acquisition device and the industrial computer pasted.
2, open the blind flange of test chamber, the medium to be tested of packing in container installs specimen mounting, and the WOL sample that processes is placed on the specimen mounting, notices that the bolt of stickup foil gauge on the maintenance sample should be exposed to the top of test(ing) medium.The lead-in wire jointing is installed, is noticed that the sealing gasket of lead-in wire jointing and blind flange should be intact, connect each foil gauge line; Check whether temperature sensor and each road mouth of pipe be normal, and the blind flange that then closes is opened industrial computer system, and the open temp controller sets test temperature and firing rate, begins test chamber is heated.Carry out Real-time Collection for temperature, load, pressure etc. in the heating process and judge whether in normal range.During such as overrun, system sends warning.
3, when test parameters reaches the standard of testing requirements, temperature controller will carry out thermostatic control, keep this moment the temperature and pressure in the container basicly stable, by temperature, load, the pressure in industrial computer monitoring and the record test chamber, by the load change on the foil gauge measurement sample, judge the spread scenarios of precrack according to the situation of change of load, Calculating Crack Extension speed, when treating that crack propagation velocity is reduced to the scope of setting, off-test.At this moment first closing temperature controller when treating that the interior temperature of closed container is reduced near environment temperature, is opened blind flange, takes out the WOL sample and observes and measure.
Claims (2)
1. a High Temperature High Pressure wedge shape is opened and is loaded pre-crackle stress corrosion testing device, it is characterized in that being made of high temperature and high pressure containers, sealing wire joint, data acquisition device, temperature controller and industrial computer;
Described high temperature and high pressure containers is to have a jacket structured closed container by what Plate Welding formed, is filled with conduction oil in the chuck, for conduction oil electric heating device is set; The top cover of described closed container is set to blind flange, at described blind flange the sealing wire joint is installed, and difference set temperature sensor, safety valve, tensimeter and pressure unit; Be provided for placing the specimen mounting of WOL sample in described closed container inside; With described sealing wire joint the foil gauge signal on the described WOL sample is drawn closed container;
Described data acquisition device is used for receiving respectively the foil gauge signal of being drawn by described sealing wire joint and the pressure signal that is detected the closed container that obtains by pressure unit;
The described industrial computer strain signal that real-time receive data vasculum sends after on-test, and be translated into the load value that calculates for crack growth rate; Described industrial computer also receives the temperature sensor detection signal that temperature controller passes over by serial communication interface; The temperature and pressure scope that is used for the control closed container by described industrial computer output control signal.
2. High Temperature High Pressure wedge shape according to claim 1 is opened and is loaded pre-crackle stress corrosion testing device, it is characterized in that described sealing wire joint is to be processed into hollow plunger with carbon steel rod, in the inner chamber of hollow plunger, fill the CPS cupric oxide inorganic adhesive and form sealing, top cover at hollow plunger is offered fairlead, signal lead connects agent by high-temp glue and is cemented in the inner chamber, and draw from fairlead, copper backing is set to guarantee sealing property between sealing wire joint and blind flange.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499504A (en) * | 2013-10-23 | 2014-01-08 | 华东理工大学 | Tiny sample stress corrosion experimental device and tiny sample stress corrosion experimental method |
| CN105891099A (en) * | 2016-06-16 | 2016-08-24 | 天津大学 | Experimental method and device for welding joint force-corrosion coupling test |
| CN106525567A (en) * | 2016-12-26 | 2017-03-22 | 大连理工大学 | Rock time-dependent deformation testing system under combined effect of continuous water environment and variable temperature |
| CN110361260A (en) * | 2018-04-11 | 2019-10-22 | 上海航空材料结构检测股份有限公司 | Stress corrosion testing device and test method of the thick sample in Strong oxdiative solution |
| CN111272644A (en) * | 2020-04-03 | 2020-06-12 | 台州龙江化工机械科技有限公司 | Liquid ammonia stress corrosion test device |
| CN111504801A (en) * | 2020-05-20 | 2020-08-07 | 西安稀有金属材料研究院有限公司 | Device and method for performing stress corrosion experiment in high-temperature liquid phase corrosion environment |
| CN111678799A (en) * | 2020-06-19 | 2020-09-18 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN117907079A (en) * | 2024-03-19 | 2024-04-19 | 中海石油气电集团有限责任公司 | Experimental device and measuring method for stress corrosion crack growth rate in low-temperature liquid ammonia |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103499504A (en) * | 2013-10-23 | 2014-01-08 | 华东理工大学 | Tiny sample stress corrosion experimental device and tiny sample stress corrosion experimental method |
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| CN105891099B (en) * | 2016-06-16 | 2018-08-31 | 天津大学 | Experimental method and device for welding joint force-corrosion coupling test |
| CN106525567A (en) * | 2016-12-26 | 2017-03-22 | 大连理工大学 | Rock time-dependent deformation testing system under combined effect of continuous water environment and variable temperature |
| CN110361260A (en) * | 2018-04-11 | 2019-10-22 | 上海航空材料结构检测股份有限公司 | Stress corrosion testing device and test method of the thick sample in Strong oxdiative solution |
| CN111272644A (en) * | 2020-04-03 | 2020-06-12 | 台州龙江化工机械科技有限公司 | Liquid ammonia stress corrosion test device |
| CN111504801A (en) * | 2020-05-20 | 2020-08-07 | 西安稀有金属材料研究院有限公司 | Device and method for performing stress corrosion experiment in high-temperature liquid phase corrosion environment |
| CN111678799A (en) * | 2020-06-19 | 2020-09-18 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN111678799B (en) * | 2020-06-19 | 2022-03-25 | 中国核动力研究设计院 | Displacement loading system applied to strain calibration device |
| CN117907079A (en) * | 2024-03-19 | 2024-04-19 | 中海石油气电集团有限责任公司 | Experimental device and measuring method for stress corrosion crack growth rate in low-temperature liquid ammonia |
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Application publication date: 20130227 |