CN112305009A - Resistance type high-temperature pressure thermal simulation test device and test method - Google Patents
Resistance type high-temperature pressure thermal simulation test device and test method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 91
- 238000004088 simulation Methods 0.000 title claims abstract description 46
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 85
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052802 copper Inorganic materials 0.000 claims abstract description 30
- 239000010949 copper Substances 0.000 claims abstract description 30
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 42
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 27
- 229910052786 argon Inorganic materials 0.000 claims description 21
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- -1 polytetrafluoroethylene Polymers 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
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- 238000013461 design Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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Abstract
The invention discloses a resistance type high-temperature pressure thermal simulation test device and a test method, which comprises a high-temperature resistant sealing box body, a high-temperature resistant sealing box cover and a parting surface sealing groove, wherein a sealing device is formed and is provided with a safety valve interface, a pressure gauge interface, a vacuum ball valve interface, a reversing valve three-way interface and a thermocouple tube interface; electrode rotating shafts penetrate through the side walls of two ends of the high-temperature resistant sealing box body respectively, the inner ends of the two electrode rotating shafts are connected with mechanical clamps respectively, and the two mechanical clamps clamp an alloy sample through sliding copper wedge blocks; the high temperature resistant sealing box cover is provided with a corresponding groove observation port. The high-temperature pressure thermal simulation test device can be used for charging high-pressure gas on a Gleeble thermal simulation test machine to perform a high-temperature pressure thermal simulation test, and realizes the sealing property after charging the high-pressure gas, the convenience for loading and taking samples, the matching property with the existing parts on the Gleeble test machine during installation, the rationality of an internal motion module and the electric conduction and heat transfer functions and the like.
Description
Technical Field
The invention relates to a welding thermal simulation technology under a pressure environment, in particular to a resistance type high-temperature pressure thermal simulation test device and a test method.
Background
A Gleeble thermal simulation tester was used to physically simulate the behavior of a material under a combination of transient heating and mechanical loading. This enables the system to simulate welding, hot rolling and continuous casting processes. In particular, the tester is effective in simulating the high heating and cooling rates often encountered in material processing, and the Gleeble thermal simulation tester has the advantage of heating the test specimen to the test temperature within seconds and maintaining the nonequilibrium solidification microstructure present at room temperature. Gleeble thermal simulation weld heat affected zone test procedure: a round or rectangular cross-section specimen is fixed between two clamps (electrodes). A low frequency alternating current is passed through the sample to generate resistance heat according to joule-lenz's law, simulating the welding heat cycle process, in a standard sample, a sample heated in this manner creates an isothermal temperature plane anywhere across the diameter of the sample and a significant temperature gradient along the sample. The temperature control of the simulated heat affected zone is realized by measuring the temperature of the sample surface by a thermocouple welded on the sample surface in real time and adjusting the current by a feedback system.
There are typically a large number of welded joints in titanium alloy structural members, and the problem with titanium alloy welding is most difficult with the low plasticity of the joints. Although most welding methods are currently available for welding titanium alloys, the literature available for review shows that the problem of joint plasticity degradation has not been effectively addressed. The high voltage environment causes the arc to shrink, the energy density of the arc to be more concentrated, and the arc force to be larger, which is beneficial for improving the performance of the welded joint. If the titanium alloy is directly subjected to welding research in a high-pressure environment, the cost is greatly increased.
The method for carrying out thermal simulation on a certain area of a welding joint by adopting a Gleeble thermal simulation testing machine is a common means in welding metallurgy research, and is economical and has strong actual reference and guidance values. However, the conventional testing device matched with the Gleeble testing machine does not have a high-voltage testing device at present.
Disclosure of Invention
The invention aims to provide a resistance type high-temperature pressure thermal simulation test device and a test method.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a resistance type high-temperature pressure thermal simulation test device, which has the following preferred specific implementation modes:
the sealing device comprises a high-temperature-resistant sealing box body and a high-temperature-resistant sealing box cover, wherein a parting surface sealing groove is formed between the high-temperature-resistant sealing box body and the high-temperature-resistant sealing box cover to form a sealing device;
the high-temperature resistant sealing box cover is respectively connected with the safety valve and the pressure gauge through a safety valve interface and a pressure gauge interface;
the side wall of the high-temperature resistant sealing box body is respectively connected with the vacuum ball valve, the reversing valve tee joint and the thermocouple junction tube through a vacuum ball valve interface, a reversing valve tee joint and a thermocouple junction tube, and the reversing valve tee joint is respectively connected with the air inlet ball valve and the exhaust ball valve;
the side walls of two ends of the high-temperature resistant sealing box body are respectively penetrated with an electrode rotating shaft, and a polytetrafluoroethylene insulating sealing ring and an insulating flange are arranged at the penetrating position;
the inner ends of the two electrode rotating shafts are respectively connected with a mechanical clamp, two supporting guide pillars are arranged between the two mechanical clamps, a polytetrafluoroethylene insulating shaft sleeve is arranged at a mounting hole of each supporting guide pillar, each mechanical clamp is provided with a clamping copper gasket and a sliding copper wedge, and the two sliding copper wedge of each mechanical clamp clamps an alloy sample;
and a groove observation port is arranged at the position, corresponding to the mechanical clamp, on the high-temperature resistant sealing box cover.
According to the high-temperature pressure thermal simulation test method realized by the resistance-type high-temperature pressure thermal simulation test device, the mechanical clamp clamps the TC4 titanium alloy cylindrical sample and heats the sample;
the vacuum ball valve is connected with a vacuum pumping system, so that the sealing device is in a vacuum state with the ultimate vacuum degree of 1.0 multiplied by 10^ -1Pa and is kept for a set time;
the gas inlet ball valve is connected with an argon gas inlet pipe, and argon gas with a constant speed is introduced into the sealing device;
in the test process, the pressure parameter of the actual test process is adjusted through the safety valve to ensure that the test pressure is in a stable state, and the pressure value of the internal gas is observed through the pressure gauge;
when the TC4 titanium alloy cylindrical sample stops heating, the three-way valves of the reversing valves on the two side walls are opened simultaneously, and the TC4 titanium alloy cylindrical sample in a high-temperature state is rapidly cooled in the sealing device through circulating argon.
The TC4 titanium alloy cylindrical sample is in interference fit with a sliding copper wedge block in the mechanical clamp in a negative tolerance mode, and the two mechanical clamps keep good parallelism;
and a thermocouple wire is spot-welded at the central position of the TC4 titanium alloy cylindrical sample, so that the sample is in a state close to zero stress and the temperature change value of the position can be accurately measured in the high-temperature heating and cooling process of the sample in a gas pressure environment.
According to the technical scheme provided by the invention, the resistance type high-temperature pressure thermal simulation test device and the test method provided by the embodiment of the invention can be used for a test method which can be used for charging high-pressure gas on a Gleeble thermal simulation test machine and carrying out a high-temperature pressure thermal simulation test. The sealing performance after the high-pressure gas is filled, the convenience in sample loading and taking, the matching performance with the existing parts on a Gleeble testing machine in the installation process, the rationality of an internal motion module and a conductive heat transfer function and the like are realized.
Drawings
FIG. 1a is a schematic view of a sealing structure of a box body in an embodiment of the present invention;
FIG. 1b is a schematic view of an open box structure according to an embodiment of the present invention;
FIG. 2 is an axial cross-sectional view of an embodiment of the present invention;
FIG. 3 is a top view of an embodiment of the present invention;
fig. 4 is a schematic assembly perspective view of a sample mechanical clamping device according to an embodiment of the present invention.
Reference numerals:
1-electrode rotating shaft, 2-polytetrafluoroethylene insulating sealing ring, 3-insulating flange, 4-high temperature resistant sealing box, 5-parting surface sealing groove, 6-high temperature resistant sealing box cover, 7-groove observation port, 8-vacuum ball valve interface, 9-thermocouple tube interface, 10-reversing valve three-way interface, 11-mechanical clamp, 12-supporting guide pillar, 13-polytetrafluoroethylene insulating guide sleeve, 14-safety valve interface, 15-pressure gauge interface, 16-clamping copper gasket and 17-sliding copper wedge block.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention relates to a resistance type high-temperature pressure thermal simulation test device, which has the following preferred specific implementation modes:
the sealing device comprises a high-temperature-resistant sealing box body and a high-temperature-resistant sealing box cover, wherein a parting surface sealing groove is formed between the high-temperature-resistant sealing box body and the high-temperature-resistant sealing box cover to form a sealing device;
the high-temperature resistant sealing box cover is respectively connected with the safety valve and the pressure gauge through a safety valve interface and a pressure gauge interface;
the side wall of the high-temperature resistant sealing box body is respectively connected with the vacuum ball valve, the reversing valve tee joint and the thermocouple junction tube through a vacuum ball valve interface, a reversing valve tee joint and a thermocouple junction tube, and the reversing valve tee joint is respectively connected with the air inlet ball valve and the exhaust ball valve;
the two end walls of the high-temperature resistant sealing box body are respectively penetrated with an electrode rotating shaft, and a polytetrafluoroethylene insulating sealing ring and an insulating flange are arranged at the penetrating position;
the inner ends of the two electrode rotating shafts are respectively connected with a mechanical clamp, two supporting guide pillars are arranged between the two mechanical clamps, a polytetrafluoroethylene insulating shaft sleeve is arranged at a mounting hole of each supporting guide pillar, each mechanical clamp is provided with a clamping copper gasket and a sliding copper wedge, and the two sliding copper wedge of each mechanical clamp clamps an alloy sample;
and a groove observation port is arranged at the position, corresponding to the mechanical clamp, on the high-temperature resistant sealing box cover.
The high-temperature pressure thermal simulation test method realized by the resistance-type high-temperature pressure thermal simulation test device has the preferred specific implementation mode that:
the mechanical clamp clamps a TC4 titanium alloy cylindrical sample and heats the sample;
the vacuum ball valve is connected with a vacuum pumping system, so that the sealing device is in a vacuum state with the ultimate vacuum degree of 1.0 multiplied by 10^ -1Pa and is kept for a set time;
the gas inlet ball valve is connected with an argon gas inlet pipe, and argon gas with a constant speed is introduced into the sealing device;
in the test process, the pressure parameter of the actual test process is adjusted through the safety valve to ensure that the test pressure is in a stable state, and the pressure value of the internal gas is observed through the pressure gauge;
when the TC4 titanium alloy cylindrical sample stops heating, the three-way valves of the reversing valves on the two side walls are opened simultaneously, and the TC4 titanium alloy cylindrical sample in a high-temperature state is rapidly cooled in the sealing device through circulating argon.
The TC4 titanium alloy cylindrical sample is in interference fit with a sliding copper wedge block in the mechanical clamp in a negative tolerance mode, and the two mechanical clamps keep good parallelism;
and a thermocouple wire is spot-welded at the central position of the TC4 titanium alloy cylindrical sample, so that the sample is in a state close to zero stress and the temperature change value of the position can be accurately measured in the high-temperature heating and cooling process of the sample in a gas pressure environment.
Under a set of test temperature and test pressure technological parameters, positive and negative electrodes are respectively connected through electrode rotating shafts at two ends to enable the pressure test device and a Gleeble test machine system to form a closed loop, the low-frequency resistance type heating mode is adopted, the cross section of a TC4 titanium alloy cylindrical sample is heated to a preset peak temperature through the current of thousands of amperes, then the heating is stopped, circulating argon with constant speed is introduced into a sealed box to rapidly cool the cylindrical sample to room temperature, and a temperature curve of the complete test process can be drawn in Gleeble control system software;
the test process in the sealing device is observed through the groove observation port.
The main technological parameters are determined by controlling the input current of the electrode rotating shafts at two ends of the pressure test device by a control system of a Gleeble testing machine, so that the heating temperature and the heating speed of a TC4 titanium alloy cylindrical sample in the pressure test device are controlled, and the optimal technological parameters are selected and adjusted according to actual conditions.
The resistance type high-temperature pressure thermal simulation test device and the test method can be used for a test method which can be used for charging high-pressure gas on a Gleeble thermal simulation test machine and carrying out high-temperature pressure thermal simulation test. The device can be introduced into a gas pressure environment to carry out a thermal simulation pressure test of a resistance type high-temperature heating metal sample, and realizes the sealing property after high-pressure gas is filled, the convenience in loading and taking the sample, the matching property with the existing parts on a Gleeble testing machine during installation, the rationality of an internal motion module and a conductive heat transfer function and the like.
The application range of the device and the method includes, but is not limited to, the following test conditions, namely, a TIG welding heat affected zone thermal simulation test of the titanium alloy is carried out under the pressure environment of argon (0.2-0.8 MPa), the process that a cylindrical sample of TC4 titanium alloy is rapidly heated to be 100-200 ℃ above the phase transition temperature and then is cooled to room temperature at a constant speed is aimed at, and therefore the conditions of microstructure distribution, structure segregation and the like of the titanium alloy heat affected zone after welding under the pressure environment and the normal pressure are analyzed and compared.
The invention designs a novel high-temperature pressure thermal simulation test device, wherein the highest working pressure required to be born by a sealed box body is 0.8MPa, the working temperature range is 0-300 ℃, the volume of the box body is about 5L, a working medium is inert gas (argon), the design pressure of the box body is 1.5MPa, and the design temperature of the box body is 350 ℃. According to the fixed pressure vessel supervision regulation, the equipment belongs to a class I pressure vessel, the material selection, design, manufacture and use requirements of the device are implemented according to the national regulation requirements, and the design of the invention has the following difficulties and unknown factors: (1) selecting high-temperature-resistant insulating sealing shaft sleeve materials and mechanical clamp materials for an electrode of the pressure device; (2) designing a sealing structure of the test box body and determining the pressure of an air pressure test; (3) in a pressure test, the temperature difference stress of the high-temperature alloy sample which is conducted to the box wall and the copper electrode insulating sealing shaft sleeves at two ends influences the sealing performance and the test result of the test device.
The thermal simulation test method adopting the invention is as follows, taking TC4 titanium alloy as an example:
before the test was started, the thermocouple wires of the box thermocouple well interface 9 were mounted in a position parallel to the cylindrical specimen of TC4 titanium alloy and spot-welded at its center position. The cylindrical test specimen is then mounted in the mechanical clamp 11 and clamped firmly by said sliding copper wedge 17, always with the welding point position of the thermocouple wire in an almost zero stress condition, to ensure that the transient temperature of the center of the TC4 titanium alloy cylindrical test specimen is accurately measured when the center position is at the peak temperature. After a high-temperature resistant sealing box cover 6 of the thermal simulation pressure device is closed and the sealing is ensured to be safe, a vacuum ball valve of an external accessory is opened through a vacuum ball valve interface 8, air in the box is pumped out through a vacuum pumping system, and the inside of the box is in a vacuum state with the ultimate vacuum degree of 1.0 multiplied by 10^ -1 Pa; then, the inlet ball valve connector is opened through the reversing valve tee joint of the box body connector 10, argon gas with a preset pressure value is introduced into the sealing device, and in order to ensure that the purity of the argon gas in the test environment of the device reaches more than 99.9%, the internal air pressure value of the device is continuously adjusted through the valve of the safety valve connector 14. After the internal air pressure is stable, the test is started, high current with two ends connected with the electrodes passes through the electrode rotating shaft 1 and is conducted to the fixed clamping gaskets 13 and the sliding copper wedge blocks 17 in the mechanical clamps 11 on the two sides, the center position of the TC4 titanium alloy cylindrical sample is rapidly heated at high temperature, the peak temperature of the uniform temperature zone can reach about 1200 ℃, the total heating process duration time of the TC4 titanium alloy cylindrical sample is 20-30 s, and when the sample reaches the preset temperature, the heating is immediately stopped. When the sample begins to be cooled, an air inlet ball valve is opened through a port on one side of a reversing valve tee joint of the box body interface 10, argon gas at a stable speed is introduced into the device and then is transmitted into a port on the other side of the reversing valve tee joint of the box body interface 10, an air outlet ball valve interface is opened, the argon gas input at a constant speed is used for rapidly cooling the TC4 titanium alloy cylindrical sample in the sealing pressure device to the room temperature, and therefore the expected requirements of the test are met.
Due to the adoption of the technical scheme, the invention has the following advantages and effects:
1. the thermal simulation device can realize the test process that a TC4 titanium alloy cylindrical sample is rapidly heated to the peak temperature (1000-1200 ℃) at the position of a uniform temperature zone and cooled to the room temperature after being fixed by a copper wedge under the pressure environment, and can simulate the temperature field change of the heat affected zone of a TC4 titanium alloy welding joint;
2. different gas pressure values (0.1-0.8 MPa) can be set for the closed pressure device, and the conditions of the microstructures of the TC4 titanium alloy sample heat-affected zone in different pressure environments are contrastingly researched;
3. the equipment has the advantages of low manufacturing cost, small occupied area and easy test, transportation and maintenance.
The high-temperature pressure thermal simulation test device comprises parts of a high-temperature-resistant sealing box body (304 stainless steel), a high-temperature-resistant sealing box cover (304 stainless steel), an electrode rotating shaft (pure copper), a mechanical clamp (high-strength aluminum alloy), a supporting guide pillar (high-strength aluminum alloy), a sliding copper wedge block (pure copper), a clamping copper gasket (pure copper), a polytetrafluoroethylene insulating shaft sleeve (polytetrafluoroethylene), a polytetrafluoroethylene insulating sealing ring (polytetrafluoroethylene), a groove observation port (quartz glass parting surface sealing ring), a fluororubber and the like. The peripheral connection standard fittings of the high-temperature resistant sealing box body comprise external accessories such as a KF25 vacuum ball valve, a stainless steel 1/4 internal thread tee joint, a stainless steel air inlet straight-through ball valve, a stainless steel exhaust straight-through ball valve, a K-type thermocouple junction tube, a high-pressure resistant aviation plug and the like, and the upper end of a high-temperature resistant sealing box cover is required to be connected with standard fittings such as a pressure gauge with the specification of 1MPa, a full-open type safety valve (high-temperature type) and the like. The above standard fittings can be purchased from the market and mounted on the thermal simulation device of the present invention, and the following test process can be completed.
The thermal simulation pressure test device is installed and fixed on a Gleeble test bed, positive and negative electrodes are respectively connected to electrode rotating shafts (1) at two ends of the thermal simulation pressure test device, so that the pressure device and the Gleeble test machine system form a closed loop, a low-frequency resistance type heating mode is adopted, the current of thousands of amperes flows through the cross section of the alloy cylindrical sample, and the temperature curve of the sample heating is controlled through the current. And the thermocouple measures the surface temperature of the alloy test sample to obtain data, and the data are fed back to a Gleeble software system. And during resistance heating, heat is mainly lost through heat conduction of clamps at two ends, so that the same cross section of a sample can be ensured to be an isothermal surface no matter in the heating or cooling process, the change condition of the actual alloy welding heat influence area structure performance under a pressure environment can be predicted through thermal simulation test data, and the resistance type alloy welding heat influence area structure performance test method has pioneering significance in the aspect of researching the structure performance of a welding joint heat influence area and a fusion area of a high-temperature alloy material under the pressure environment.
The specific embodiment is as follows:
after the test process parameters are determined, the following test scheme under the pressure environment can be implemented. Through a displacement and temperature sensor of a Gleeble testing machine, an isothermal temperature plane is generated at any position of a stress change curve and a sample diameter in the process of heating the alloy sample to be cooled in real time, an obvious temperature gradient distribution curve is generated along the sample, important experimental data can be provided in the subsequent alloy welding thermal simulation test research, and feedback parameter data can be provided for a further research scheme according to an actual test result.
The invention relates to a thermal simulation pressure device installation mode: the high-temperature resistant sealing box body 4 and the two-end electrode rotating shaft 1 are fixedly connected through the insulating flange 3 and the polytetrafluoroethylene insulating sealing sleeve 2, so that the sealing box body and the sealing box cover keep insulation after high current is introduced to the two-end electrodes, and external accessories are in a normal working state; the mechanical clamps 11 on the two sides are fixedly connected with the electrode rotating shaft 1, the four clamping copper gaskets 16 on the inner side planes of the mechanical clamps 11 on the two sides are tightly connected and fixed through screws, and the two sliding copper wedges 17 in the mechanical clamp 11 on the single side move to the end position in an inclined angle of 20 degrees; the mechanical clamps 11 on the two sides are fixedly connected with the polytetrafluoroethylene insulation guide sleeve 13 through the support guide pillars 12, so that the current of the whole device can only pass through a cylindrical sample at the center of the sliding copper wedge 17 in the mechanical clamps 11, and the good parallelism of the clamps on the two sides is ensured; a thermocouple wire of a thermocouple tube interface 9 of the box body is parallel to the central position of the cylindrical sample; the high-temperature resistant sealing box cover 6 is fixedly connected with the high-temperature resistant sealing box body 4 in a sealing way through a sealing ring and peripheral bolts on a parting surface; the observation port 7 of the groove formed on the high-temperature-resistant sealed box cover 6 is fixedly connected with the high-temperature-resistant transparent glass through a bolt, and the macroscopic change of the TC4 titanium alloy cylindrical sample in the test process can be observed right above the observation port.
The specific thermal simulation pressure test mode is as follows: before the test was started, the thermocouple wires of the box thermocouple well interface 9 were mounted in a position parallel to the cylindrical specimen of TC4 titanium alloy and spot-welded at its center position. The cylindrical sample is then mounted in a mechanical fixture 11 and clamped and fixed by the sliding copper wedge 17 in a negative tolerance interference fit with a 10mm diameter TC4 titanium alloy cylindrical sample, and the welding point position of the thermocouple wire is always in an almost zero stress state, so as to ensure that the transient temperature of the center of the sample can be accurately measured when the center position of the TC4 titanium alloy cylindrical sample is at the peak temperature. After a high-temperature resistant sealing box cover 6 of the thermal simulation pressure device is closed and the sealing is ensured to be safe, a vacuum ball valve of an external accessory is opened through a vacuum ball valve interface 8, air in the box is pumped out through a vacuum pumping system, and the inside of the box is in a vacuum state with the ultimate vacuum degree of 1.0 multiplied by 10^ -1 Pa; then, the inlet ball valve connector is opened through the reversing valve tee joint of the box body connector 10, argon gas with a preset pressure value is introduced into the sealing device, and in order to ensure that the purity of the argon gas in the test environment of the device reaches more than 99.9%, the internal air pressure value of the device is continuously adjusted through the valve of the safety valve connector 14. After the internal air pressure is stable, the test is started, high current with two ends connected with the electrodes passes through the electrode rotating shaft 1 and is conducted to the copper block clamping gaskets 16 and the sliding copper wedge blocks 17 in the mechanical clamps 11 on the two sides, the center position of the TC4 titanium alloy cylindrical sample is rapidly heated at high temperature, the peak temperature of the uniform temperature zone can reach about 1200 ℃, and the total heating process duration of the cylindrical sample is estimated to be 20-30 s. When the sample reaches a predetermined temperature, heating is immediately stopped. When the TC4 titanium alloy sample starts to be cooled, an air inlet ball valve is opened through a connector on one side of a reversing valve tee joint of the box body interface 10, argon gas at a stable speed is introduced into the device and then is transmitted to a connector on the other side of the reversing valve tee joint of the box body interface 10, an air outlet ball valve is opened, the output is output, and circulating argon gas at a constant speed rapidly cools the TC4 titanium alloy cylindrical sample in the sealed pressure device to room temperature.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A resistance type high-temperature pressure thermal simulation test device is characterized by comprising a high-temperature resistant sealing box body (4) and a high-temperature resistant sealing box cover (6), wherein a parting surface sealing groove (5) is arranged between the high-temperature resistant sealing box body (4) and the high-temperature resistant sealing box cover (6) to form a sealing device;
the high-temperature resistant sealing box cover (6) is respectively connected with a safety valve and a pressure gauge through a safety valve interface (14) and a pressure gauge interface (15);
the side wall of the high-temperature resistant sealing box body (4) is respectively connected with a vacuum ball valve, a reversing valve tee joint and a thermocouple junction tube through a vacuum ball valve interface (8), a reversing valve tee joint interface (10) and a thermocouple junction tube interface (9), and the reversing valve tee joint is respectively connected with an air inlet ball valve and an exhaust ball valve;
the two end walls of the high-temperature resistant sealing box body (4) are respectively penetrated by an electrode rotating shaft (1), and a polytetrafluoroethylene insulating sealing ring (2) and an insulating flange (3) are arranged at the penetrating position;
the inner ends of the two electrode rotating shafts (1) are respectively connected with mechanical clamps (11), two supporting guide columns (12) are arranged between the two mechanical clamps (11), polytetrafluoroethylene insulating shaft sleeves (13) are arranged at mounting holes of the supporting guide columns (12), the mechanical clamps (11) are provided with clamping copper gaskets (16) and sliding copper wedge blocks (17), and the sliding copper wedge blocks (17) of the two mechanical clamps (11) clamp alloy samples;
and a groove observation port (7) is arranged on the high-temperature resistant sealing box cover (6) corresponding to the mechanical clamp (11).
2. The method for high-temperature pressure thermal simulation test of the resistive high-temperature pressure thermal simulation test device according to claim 1, wherein the mechanical clamp (11) clamps the cylindrical sample of TC4 titanium alloy and heats the cylindrical sample;
the vacuum ball valve is connected with a vacuum pumping system, so that the sealing device is in a vacuum state with the ultimate vacuum degree of 1.0 multiplied by 10^ -1Pa and is kept for a set time;
the gas inlet ball valve is connected with an argon gas inlet pipe, and argon gas with a constant speed is introduced into the sealing device;
in the test process, the pressure parameter of the actual test process is adjusted through the safety valve to ensure that the test pressure is in a stable state, and the pressure value of the internal gas is observed through the pressure gauge;
when the TC4 titanium alloy cylindrical sample stops heating, the three-way valves of the reversing valves on the two side walls are opened simultaneously, and the TC4 titanium alloy cylindrical sample in a high-temperature state is rapidly cooled in the sealing device through circulating argon.
The TC4 titanium alloy cylindrical sample is in interference fit with a sliding copper wedge (17) in the mechanical clamp (11) with negative tolerance, and the two mechanical clamps (11) keep good parallelism;
and a thermocouple wire is spot-welded at the central position of the TC4 titanium alloy cylindrical sample, so that the sample is in a state close to zero stress and the temperature change value of the position can be accurately measured in the high-temperature heating and cooling process of the sample in a gas pressure environment.
3. The resistance type high-temperature pressure thermal simulation test method according to claim 2, characterized in that under a set of test temperature and test pressure process parameters, positive and negative electrodes are respectively connected through electrode rotating shafts at two ends to enable the pressure test device and a Gleeble tester system to form a closed loop, a low-frequency resistance type heating mode is adopted, a current of thousands of amperes is passed through the cross section of the TC4 titanium alloy cylindrical sample, the sample is controlled to be heated to a preset peak temperature through the current, then heating is stopped, circulating argon gas with a constant speed is introduced into the sealed box to rapidly cool the cylindrical sample to room temperature, and a temperature curve of the complete test process can be drawn in Gleeble control system software;
the test process in the sealing device is observed through the groove observation port (7).
4. The method for the resistive high-temperature pressure thermal simulation test according to claim 3, wherein the main process parameters are determined by controlling the input current of the electrode rotating shaft (1) at two ends of the pressure test device by a control system of a Gleeble tester, so as to control the heating temperature and the heating speed of the TC4 titanium alloy cylindrical sample in the pressure test device, and the optimal process parameters are selected and adjusted according to actual conditions.
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