CN113820223B - Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-wall pipe - Google Patents
Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-wall pipe Download PDFInfo
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- CN113820223B CN113820223B CN202111098263.7A CN202111098263A CN113820223B CN 113820223 B CN113820223 B CN 113820223B CN 202111098263 A CN202111098263 A CN 202111098263A CN 113820223 B CN113820223 B CN 113820223B
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000009864 tensile test Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000011261 inert gas Substances 0.000 claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims description 73
- 238000012806 monitoring device Methods 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 9
- 239000011521 glass Substances 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an inert atmosphere protection device for a high-temperature performance tensile test of a thin-wall pipe, which comprises a protection pipe and an air duct extending into the protection pipe, wherein an opening is formed in the pipe wall of the protection pipe, two ends of the protection pipe in the length direction are sealed, a thin-wall pipe sample is arranged along the length direction of the protection pipe, the length of the thin-wall pipe sample is longer than that of the protection pipe, two ends of the thin-wall pipe sample are provided with air inlets, one air inlet is used for conveying inert gas to the inner cavity of the thin-wall pipe sample, the other air inlet is used for conveying inert gas, and the air duct is used for conveying inert gas to the outer wall of the thin-wall pipe sample; the invention also discloses a test device and a method for the high-temperature performance tensile test of the inert atmosphere protection thin-wall tube, comprising the inert atmosphere protection device. The inert atmosphere protection device, the test device and the method for the high-temperature performance tensile test of the inert atmosphere protection thin-wall pipe can accurately provide a stable inert gas environment for the high-temperature tensile test of the thin-wall pipe sample.
Description
Technical Field
The invention belongs to the field of detection of physicochemical mechanical properties of metal materials, and particularly relates to an inert atmosphere protection device for a tensile test of high-temperature properties of a thin-wall pipe, and a test device and a method for the tensile test of the high-temperature properties of the thin-wall pipe under the protection of the inert atmosphere.
Background
At present, the domestic high-temperature tensile test of the pipe adopts a 'GB/T4338-2006 high-temperature tensile test method of metal materials', and a split resistance furnace is additionally arranged on a room-temperature stretcher for detection. In the experimental process, the furnace body is not provided with a sealing design, so that the surface of a sample inevitably oxidizes in the stretching process, and for small-diameter pipes (such as pipes with the diameter less than or equal to 16 mm), particularly thin-wall pipes (such as pipes with the wall thickness within the range of 0.5-3 mm), the oxidization in the heating process affects the measurement of the high-temperature stretching performance of the material on one hand, and on the other hand, the extraction of fracture and tissue information of the stretched sample is also adversely affected.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art and achieve the above-mentioned objects, a first object of the present invention is to provide an inert atmosphere protection device for a tensile test of high temperature performance of a thin-walled tube, which can accurately provide a stable inert atmosphere for the tensile test of high temperature of a thin-walled tube sample, thereby avoiding uncertain factors caused by oxidation of the sample during the experiment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the inert atmosphere protection device comprises a protection tube and an air duct extending into the protection tube, wherein an opening is formed in the tube wall of the protection tube, two ends of the protection tube in the length direction are sealed, a thin-wall tube sample is arranged along the length direction of the protection tube, the length of the thin-wall tube sample is larger than that of the protection tube, part of the thin-wall tube sample is arranged in the protection tube, two ends of the thin-wall tube sample extend out of the protection tube, two air inlets are arranged at two ends of the thin-wall tube sample, one of the two air inlets is used for conveying inert gas to the inner cavity of the thin-wall tube sample, the other one of the two air inlets is used for conveying the inert gas, and the air duct is used for conveying the inert gas to the outer wall of the thin-wall tube sample. Inert gas flows out from one of the air charging nozzles after entering the inner cavity of the thin-wall pipe sample through the other air charging nozzle, so that the inner wall of the thin-wall pipe sample is prevented from being oxidized, and the inert gas is conveyed into the protective pipe through the protective pipe and the air guide pipe, so that the outer wall of the thin-wall pipe sample is prevented from being oxidized.
In the above technical scheme, preferably, hanging plates are arranged at two ends of the length direction of the protection tube, the protection tube is fixed with the hanging plates through pressing plates, each pressing plate comprises a first semi-annular pressing plate and a second semi-annular pressing plate, the first semi-annular pressing plate and the second semi-annular pressing plates are arranged on the hanging plates through fasteners, and the protection tube is located between the first semi-annular pressing plates and the second semi-annular pressing plates. The hanging plate and the pressing plate are arranged to fix the protection pipe, and the upper end and the lower end of the protection pipe are sealed.
In the above technical solution, it is further preferable that first sealing rings are provided at two ends of the protection tube in the length direction, and the first sealing rings are located between the protection tube and the hanging plate. The protection tube is a glass tube, and the first sealing rings are sealed at two ends of the glass tube, so that the overflow of inert gas in the glass tube can be reduced.
In the above technical solution, still further preferably, a through hole through which the thin-walled tube sample passes is formed in the thickness direction of the hanging plate, the circumferential surface of the through hole is recessed in a direction away from the center of the through hole to form a recessed annular groove, and a second sealing ring is disposed in the recessed annular groove. The inner wall of the second sealing ring is propped against the outer wall of the thin-wall pipe sample, and the sealing effect in the protection pipe is further ensured and the overflow of inert gas in the protection pipe is reduced by arranging the concave annular groove and the second sealing ring positioned in the concave annular groove.
In the above technical solution, it is still further preferable that the number of the air ducts is two, one of the two air ducts passes through one of the two hanging plates and extends into the protection tube, the other of the two air ducts passes through the other of the two hanging plates and extends into the protection tube, and a plurality of air blowing holes with openings facing the thin-walled tube sample are formed in the tube wall of the air duct. The gas guide pipe is divided into an upper part and a lower part, which are respectively arranged beside the thin-wall pipe sample in the protection pipe, so that inert gas conveyed to the outer wall of the thin-wall pipe sample is blown to the outer wall of the pipe body from top to bottom and from bottom to top in two flow directions to prevent oxidation, and the inert gas is uniformly blown to the outer wall of the pipe body through the gas blowing holes on the pipe wall of the gas guide pipe.
The second object of the invention is to provide a test device for the high-temperature performance tensile test of the thin-wall tube protected by inert atmosphere, which can accurately provide a stable inert gas environment for the high-temperature tensile test of the thin-wall tube sample, thereby avoiding uncertain factors caused by sample oxidation in the experimental process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a test device of inert atmosphere protection thin wall pipe high temperature performance tensile test, includes the heating cauldron inert atmosphere protection device and be used for the centre gripping the tensile device of thin wall pipe sample, inert atmosphere protection device follows the direction of height of heating cauldron sets up, the protection pipe is located in the heating cauldron, two one of the clamp plates is shelved on the top surface of heating cauldron, two another clamp plate in the clamp plate is located the below of heating cauldron, two the link plate is located respectively the top and the below of heating cauldron. The thin-wall tube sample comprises a tube body and through hole pins arranged at two ends of the length direction of the tube body, one end of each through hole pin stretches into the tube body and is connected with the tube body, the other end of each through hole pin is connected with the charging connector, and vent holes penetrating through the length direction of the through hole pin are formed in the through hole pins. The through hole pin is positioned at two ends of the thin-wall pipe sample and is provided with a vent hole penetrating through the length direction of the through hole pin, the through hole pin is connected with the charging connector at the corresponding side on one hand and is used for supplying inert gas into the pipe body, so that oxidation in the test process of the inner wall of the thin-wall pipe sample is avoided, and on the other hand, the pipe wall function of the supporting pipe body is achieved, and the pipe body is prevented from pulling out or deforming in the clamping and stretching process of the stretching device.
In the above technical solution, preferably, an inflating nozzle for delivering inert gas to the inner cavity of the thin-walled tube sample is located above the heating kettle, and an inflating nozzle for delivering the inert gas is located below the heating kettle. Therefore, the flow direction of the inert gas in the inner cavity of the thin-wall tube sample is from top to bottom so as to convey the inert gas to the inner cavity of the thin-wall tube sample from top to bottom to protect the inner wall of the tube body from oxidization.
In the above technical scheme, preferably, the heating kettle further comprises a first heating kettle body and a second heating kettle body which are symmetrically arranged along a central line in the vertical direction, an air permeable cavity is arranged between the first heating kettle body and the second heating kettle body, one of the two air guide pipes is positioned in the first heating kettle body and one of the second heating kettle body, and the other of the two air guide pipes is positioned in the first heating kettle body and the other of the second heating kettle body. The two air ducts are positioned in different heating kettles, and then the two air ducts respectively convey inert gas to the outer wall of the thin-wall tube sample tube body from different heating kettles (further, the radial different directions of the tube body of the thin-wall tube sample) and different directions (from top to bottom or from bottom to top) so as to avoid the oxidation of the outer wall of the tube body.
In the above technical scheme, still further preferably, the device further comprises a displacement monitoring device for monitoring displacement change of the thin-wall pipe sample in real time and a temperature monitoring device for measuring temperature in the protection pipe in real time, one end of the displacement monitoring device is arranged on the outer wall surface of the thin-wall pipe sample, the other end of the displacement monitoring device penetrates through the opening to extend out of the ventilation cavity, and the temperature monitoring device is sleeved on the outer wall of the thin-wall pipe sample. The heating kettle is a split type resistance furnace, the temperature monitoring device is a thermocouple, the displacement monitoring device is an extensometer, the temperature is controlled by the temperature monitoring device in the test process, and the two monitoring devices are respectively used for monitoring the displacement change and the temperature of a sample in the heating kettle in real time under the condition of constant test temperature, so that the displacement change is monitored in real time, and the test temperature is accurately controlled.
The third object of the invention is to provide a method for protecting the high-temperature performance tensile test of the thin-wall pipe by using inert atmosphere, which can accurately provide a stable inert gas environment for the high-temperature tensile test of the thin-wall pipe sample, thereby avoiding uncertain factors caused by sample oxidation in the experimental process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for tensile testing of high-temperature performance of a thin-wall tube by utilizing inert atmosphere protection comprises the following steps:
fixing a thin-wall tube sample; inert gas is introduced into the charging connector above the heating kettle to convey the inert gas to the inner cavity of the thin-wall tube sample; inert gas is introduced into the two gas guide pipes to convey the inert gas to the outer wall of the thin-wall pipe sample; the stretching device stretches the thin-wall tube sample.
Compared with the prior art, the invention has the following advantages:
1. on the premise of not changing the structure of the existing room temperature stretcher, a stable inert gas environment can be accurately provided for the tensile test of the thin-wall tube sample Gao Wenzheng tube, so that uncertain factors caused by sample oxidation in the experimental process are avoided.
2. The equipment transformation cost is reduced, the economic cost is low, and an equipment foundation is provided for accurate evaluation of the high-temperature tensile property of the thin-wall pipe and fracture research after the test.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a test apparatus for tensile testing of high temperature performance of an inert atmosphere protective thin walled tube in a preferred embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a test apparatus for tensile testing of high temperature performance of an inert atmosphere protective thin walled tube in a preferred embodiment of the present invention (with one side of the heating kettle body and the corresponding side of the gas tube and connector removed);
FIG. 3 is a top view of a test apparatus for tensile testing of the high temperature performance of an inert atmosphere protected thin walled tube in a preferred embodiment of the present invention;
FIG. 4 is a schematic view in section A-A of FIG. 3;
wherein: thin-walled tube sample-100; a first through-hole pin-110; a second through hole pin-120; a tube body-130; a vent-140; a first charging nozzle-150; a second charging nozzle-160; a protective tube-200; an opening-210; a first airway-310; a first nipple-311; a second airway-320; a second nipple-321; a first heated kettle body-510; a second heating kettle body-520; a venting lumen-530; a first hanger plate-610; a second hanger plate-620; pressing plate-700; a first semi-annular platen-710; a second semi-annular platen-720; a first seal ring-810; a second seal ring-820; moving the monitoring device-910; temperature monitoring device-920.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Referring to fig. 1-4, the test device for testing the high temperature performance tensile test of the inert atmosphere protection thin-wall tube in this embodiment is suitable for the measurement test of the high temperature tensile performance of the thin-wall tube sample, specifically, the test device comprises a heating kettle, an inert atmosphere protection device and a tensile device for clamping the thin-wall tube sample 100, the heating kettle is a split resistance furnace, the heating kettle comprises a first heating kettle body 510 and a second heating kettle body 520 which are symmetrically arranged along the central line in the vertical direction, a ventilation cavity 530 is arranged between the first heating kettle body 510 and the second heating kettle body 520, the thin-wall tube sample 100 is arranged between the first heating kettle body 510 and the second heating kettle body 520 along the height direction of the heating kettle, the length of the thin-wall tube sample 100 is greater than the height of the heating kettle, part of the thin-wall tube sample 100 is positioned in the heating kettle, part of the thin-wall tube sample 100 is positioned outside the heating kettle, the inert atmosphere protection device comprises a protection tube 200 and a first air guide tube 310 and a second air guide tube 320 which extend into the protection tube 200, openings 210 are arranged on the tube wall of the protection tube 200, the two ends of the thin-wall tube 200 are sealed, the thin-wall tube 200 is arranged along the length direction of the first heating kettle body 510 and the second heating kettle body 520, the length of the thin-wall tube 100 is arranged along the length direction of the protection tube 100, the length of the thin-wall tube 100 is arranged along the length of the protection tube 100, the length of the first air guide tube 100 is arranged at the second air guide tube 100, the length of the first air guide tube is arranged at the second air guide tube is extended by the end of the protection tube 100, the length of the inert gas tube is extended by the length of the inert gas tube 100, and the inert gas tube sample 100 is extended out of the inert gas sample is extended by the air, and the inert gas tube sample is extended by the inert gas sample is extended by the air, and the inert gas tube is used to be used for the inert gas sample, and the inert gas is used for the inert gas test sample is used for the test, and the inert gas test, and is used for the test, and can be protected.
The thin-walled tube sample 100 includes a tube body 130, a first through-hole pin 110 provided at an upper end of the tube body 130, and a second through-hole pin 120 provided at a lower end of the tube body 130, and the first through-hole pin 110 and the second through-hole pin 120 are each provided with a vent hole 140 penetrating in a length direction thereof. The upper end of the first through hole pin 110 is connected with the first charging connector 150, the lower end of the first through hole pin 110 stretches into the inner cavity of the pipe body 130 and is connected with the pipe body 130, the upper end of the second through hole pin 120 stretches into the inner cavity of the pipe body 130 and is connected with the pipe body 130, the lower end of the second through hole pin 120 is connected with the second charging connector 160, the first charging connector 150 is located above the heating kettle and is communicated with the inert gas storage device, and the second charging connector 160 is located below the heating kettle and is communicated with the outside air. The inert gas sequentially passes through the first charging nozzle 150, the vent hole 140 of the first through hole pin 110, the inner cavity of the pipe body 130, the vent hole 140 of the second through hole pin 120 and the second charging nozzle 160, so that the inert gas is conveyed to the inner wall of the pipe body 130, and the oxidation of the inner wall of the pipe body 130 is avoided. In addition, the first through hole pin 110 and the second through hole pin 120 are located at two ends of the thin-walled tube sample 100 in the length direction and are connected with the tube body 130 in a welded manner, so that the corresponding side air charging nozzles are connected with the first air charging nozzle 150 and the second air charging nozzle 160 on one hand, and can be used for introducing inert gas into the inner cavity of the tube body 130 after being communicated with the inert gas storage device filled with inert gas, further oxidation of the inner wall of the thin-walled tube sample 100 in the test process is avoided, and on the other hand, the tube wall of the tube body 130 is supported, and pulling-out or tube wall deformation of the tube body 130 in the clamping and stretching processes of the stretching device is prevented. The stretching device is two first diagonal blocks 410 and two second diagonal blocks 420 clamped on the outer wall surface of the pipe body 130.
The upper end and the lower end of the protection tube 200 in the length direction are respectively provided with a first hanging plate 610 and a second hanging plate 620, the first hanging plate 610 and the second hanging plate 620 are respectively positioned above and below the heating kettle, the protection tube 200 is fixed between the first hanging plate 610 and the second hanging plate 620 through a pressing plate 700, the pressing plate 700 comprises a first semi-annular pressing plate 710 and a second semi-annular pressing plate 720, the first semi-annular pressing plate 710 and the second semi-annular pressing plate 720 are arranged on the hanging plates (the first hanging plate 610 or the second hanging plate 620) on the corresponding sides through fasteners, the protection tube 200 is positioned between the first semi-annular pressing plate 710 and the second semi-annular pressing plate 720, the upper end and the lower end of the protection tube 200 are respectively provided with a first sealing ring 810, the first sealing ring 810 is positioned between the protection tube 200 and the first hanging plate 610, and the first sealing ring 810 is positioned between the protection tube 200 and the second hanging plate 620. Of course, through holes for the thin-wall tubes 130 to pass through are formed in the thickness direction of the first hanging plate 610 and the second hanging plate 620, the peripheral surfaces of the through holes are recessed in the direction away from the center of the through holes to form recessed annular grooves, second sealing rings 820 are arranged in the recessed annular grooves, the protection tube 200 is a glass tube, the first sealing rings 810 are sealed at two ends of the glass tube, the inner walls of the second sealing rings 820 are propped against the outer walls of the thin-wall tubes 130, and the sealing effect in the protection tube 200 is further guaranteed by arranging the first sealing rings 810, the recessed annular grooves and the second sealing rings 820 positioned in the first sealing rings, so that the overflow of inert gas in the protection tube 200 is reduced. The inert atmosphere protection device is placed in the heating kettle by one of the pressure plates 700 resting on the top surface of the heating kettle, of course the other pressure plate 700 is located below the heating kettle.
The first air duct 310 comprises a duct wall, an inlet and an outlet, the first air duct 310 penetrates through the first hanging plate 610 along the thickness direction of the first hanging plate 610, part of the first air duct 310 stretches out of the heating kettle, the inlet of the first air duct 310 is positioned above the first heating kettle body 510, the outlet of the first air duct 310 is positioned in the protection duct 200, the inlet of the first air duct 310 is connected with the first connector 311, the first connector 311 is connected with the inert gas storage device, the duct wall of the first air duct 310 is provided with a plurality of air blowing holes with openings facing the thin-wall duct 130, the second air duct 320 comprises a duct wall, an inlet and an outlet, the second air duct 320 penetrates through the second hanging plate 620 along the thickness direction of the second hanging plate 620, part of the second air duct 320 stretches out of the heating kettle, the inlet of the second air duct 320 is positioned below the second heating kettle body 520, the outlet of the second air duct 320 is positioned in the protection duct 200, the inlet of the second air duct 320 is connected with the second connector 321, the second connector 321 is connected with the inert gas storage device, and the duct wall of the second air duct 320 is provided with a plurality of air blowing holes facing the thin-wall duct 130. The two ends of the protection tube 200 in the length direction are sealed, and the inert gas is conveyed to the outer wall of the thin-wall tube 130 from different heating kettle bodies (further, the radial directions of the thin-wall tube 130 are different) and different directions (from top to bottom or from bottom to top) respectively through the two air guide pipes of the first air guide pipe 310 and the second air guide pipe 320, so that the outer wall of the thin-wall tube 130 is prevented from being oxidized.
In addition, the tube tensile test loading device further comprises a displacement monitoring device 910 for monitoring displacement change of the thin-walled tube sample 100 in real time and a temperature monitoring device 920 for measuring temperature in the protection tube 200 in real time, one end of the displacement monitoring device 910 is arranged on the outer wall surface of the thin-walled tube 130, the other end of the displacement monitoring device 910 penetrates through the opening 210 and extends out of the ventilation cavity 530 to be communicated with external ventilation, and the temperature monitoring device 920 is sleeved on the outer wall of the thin-walled tube 130. Wherein, temperature monitoring device 920 is the thermocouple, and displacement monitoring device 910 is the extensometer, and temperature through temperature monitoring device 920 control temperature and make thin wall pipe 130 be in under the invariable experimental temperature condition in the test process, two monitoring devices are used for real-time supervision heating cauldron internal thin wall pipe sample displacement change and temperature respectively to real-time supervision displacement change, accurate control test temperature.
The method for tensile testing of the high-temperature performance of the thin-wall tube protected by inert atmosphere comprises the following steps:
fixing a thin-wall pipe sample by adopting the test device for the high-temperature performance tensile test of the inert atmosphere protection thin-wall pipe; introducing inert gas into the first charging connector above the heating kettle to convey the inert gas to the inner cavity of the thin-wall tube sample, and enabling the inert gas to flow out from the second charging connector below the heating kettle; inert gas is introduced into the first air duct and the second air duct to convey the inert gas to the outer wall of the thin-wall pipe sample; the stretching device stretches the thin-wall tube sample.
For convenience of description and understanding, the above steps are separately described, but they are not limited thereto, and in actual practice, at least some of the above steps may be performed simultaneously or in no sequence, for example, by introducing inert gas while stretching.
The high temperature in the present invention depends on the experimental requirements and the high temperature resistant materials of the heating furnace and the jig of the testing machine, and is generally considered to be about 1200 ℃.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (7)
1. An inert atmosphere protection device for tensile testing of high-temperature performance of a thin-wall pipe is characterized in that: the inert atmosphere protection device comprises a protection tube and an air duct extending into the protection tube, wherein an opening is formed in the tube wall of the protection tube, two ends of the protection tube in the length direction are sealed, a thin-wall tube sample is arranged along the length direction of the protection tube, the length of the thin-wall tube sample is larger than that of the protection tube, a part of the thin-wall tube sample is arranged in the protection tube, two ends of the thin-wall tube sample extend out of the protection tube, air inlets are arranged at two ends of the thin-wall tube sample, one of the two air inlets is used for conveying inert gas to the inner cavity of the thin-wall tube sample, the other one of the two air inlets is used for conveying the inert gas, and the air duct is used for conveying the inert gas to the outer wall of the thin-wall tube sample;
hanging plates are arranged at two ends of the length direction of the protection tube, the protection tube is fixed with the hanging plates through pressing plates, the pressing plates comprise a first semi-annular pressing plate and a second semi-annular pressing plate, the first semi-annular pressing plate and the second semi-annular pressing plate are arranged on the hanging plates through fasteners, and the protection tube is located between the first semi-annular pressing plate and the second semi-annular pressing plate; the two ends of the length direction of the protection tube are provided with first sealing rings, and the first sealing rings are positioned between the protection tube and the hanging plate; the through hole for the thin-wall tube sample to pass through is formed in the thickness direction of the hanging plate, the peripheral surface of the through hole is recessed in a direction away from the center of the through hole to form a recessed annular groove, and a second sealing ring is arranged in the recessed annular groove;
and continuously introducing inert gas while performing high-temperature performance tensile test.
2. An inert atmosphere protection device according to claim 1, wherein: the number of the air guide pipes is two, one of the two air guide pipes penetrates through one of the two hanging plates to extend into the protection pipe, the other of the two air guide pipes penetrates through the other of the two hanging plates to extend into the protection pipe, and a plurality of air blowing holes with openings facing the thin-wall pipe sample are formed in the pipe wall of the air guide pipe.
3. A test device for testing high-temperature performance of an inert atmosphere protection thin-wall tube is characterized in that: the device comprises a heating kettle, an inert atmosphere protection device and a stretching device, wherein the inert atmosphere protection device is used for clamping the thin-wall pipe sample, the inert atmosphere protection device is arranged along the height direction of the heating kettle, the protection pipe is positioned in the heating kettle, one of two pressing plates is placed on the top surface of the heating kettle, the other of the two pressing plates is positioned below the heating kettle, and the two hanging plates are respectively positioned above and below the heating kettle.
4. A test device according to claim 3, wherein: the charging nozzle for conveying inert gas to the inner cavity of the thin-wall tube sample is positioned above the heating kettle, and the charging nozzle for conveying the inert gas is positioned below the heating kettle.
5. The test device of claim 4, wherein: the heating kettle comprises a first heating kettle body and a second heating kettle body which are symmetrically arranged along the central line in the vertical direction, a ventilation cavity is arranged between the first heating kettle body and the second heating kettle body, one of two air ducts is positioned in the first heating kettle body and one of the second heating kettle bodies, and the other of the two air ducts is positioned in the first heating kettle body and the other of the second heating kettle bodies.
6. The test device of claim 5, wherein: the device also comprises a displacement monitoring device for monitoring the displacement change of the thin-wall pipe sample in real time and a temperature monitoring device for measuring the temperature in the protection pipe in real time, wherein one end of the displacement monitoring device is arranged on the outer wall surface of the thin-wall pipe sample, the other end of the displacement monitoring device penetrates through the opening to extend out of the ventilation cavity, and the temperature monitoring device is sleeved on the outer wall of the thin-wall pipe sample.
7. A method of performing a tensile test of the high temperature performance of a thin walled tube using the test apparatus of any of claims 3-6, comprising the steps of:
fixing a thin-wall tube sample;
inert gas is introduced into the charging connector above the heating kettle to convey the inert gas to the inner cavity of the thin-wall tube sample;
inert gas is introduced into the two gas guide pipes to convey the inert gas to the outer wall of the thin-wall pipe sample;
the stretching device stretches the thin-wall tube sample.
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| CN202311058160.7A CN117330430A (en) | 2021-09-18 | 2021-09-18 | Test device and test method suitable for tensile test of high-temperature performance of thin-wall pipe |
| CN202111098263.7A CN113820223B (en) | 2021-09-18 | 2021-09-18 | Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-wall pipe |
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