CN113866027A - Heat-salt-force-water-oxygen coupled corrosion fatigue test device and method - Google Patents
Heat-salt-force-water-oxygen coupled corrosion fatigue test device and method Download PDFInfo
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- CN113866027A CN113866027A CN202111134921.3A CN202111134921A CN113866027A CN 113866027 A CN113866027 A CN 113866027A CN 202111134921 A CN202111134921 A CN 202111134921A CN 113866027 A CN113866027 A CN 113866027A
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- 239000001301 oxygen Substances 0.000 title claims abstract description 106
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 106
- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 238000005260 corrosion Methods 0.000 title claims abstract description 28
- 238000009661 fatigue test Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000012360 testing method Methods 0.000 claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 239000012266 salt solution Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 230000009191 jumping Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
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- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000007769 metal material Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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Abstract
The invention discloses a heat-salt-force-water-oxygen coupled corrosion fatigue test device and a method, which comprises a testing machine, a heating jacket, a flask, an oxygen flowmeter, a water vapor flowmeter, a heat-resistant alloy inner container, a resistance furnace, a bracket, a first conduit, a second conduit, a temperature measuring instrument, an oxygen measuring instrument, an air valve and an oxygen bottle; the testing machine comprises a main shaft and a clamp; the resistance furnace is arranged on the bracket and surrounds the clamp to heat the sample; the heat-resistant alloy inner container is arranged in the resistance furnace and used for preventing water vapor from directly contacting with furnace wires of the resistance furnace during a test; the oxygen cylinder releases oxygen and introduces the oxygen to the surface of the sample; after being heated, water in the flask generates steam and is introduced to the surface of the sample; the temperature measuring instrument and the oxygen measuring instrument are used for measuring the temperature and the oxygen content of the area near the surface of the sample so as to realize the accurate regulation and control of the temperature and the oxygen content of the area near the surface of the measured sample; the method can scientifically evaluate the corrosion fatigue failure behavior of the engineering material and the structure under the complex service condition.
Description
Technical Field
The invention belongs to the technical field of material tests, and particularly relates to a corrosion fatigue test device and method.
Background
The traditional rotary bending fatigue testing machine can be used for carrying out room temperature and high temperature fatigue tests on materials. However, for an equipment engine component in service in a marine environment, in addition to being subjected to alternating stress and high temperature environmental factors, the equipment engine component is also subjected to erosion of a salt spray environment, thereby greatly affecting the service life and the safety and reliability of the engine component. In addition, researchers find that the existence of trace water vapor and oxygen can accelerate the high-temperature corrosion of metal materials, reduce the mechanical property of the metal materials and influence the service life of high-temperature service components. In addition, water and oxygen exist in the actual marine service environment, so that the complex working condition of the five factors of heat-salt-alternating stress-water-oxygen coupling has great influence on the service life of the parts of the power device of the engineering equipment, and a scientific and reasonable evaluation method needs to be established. However, at present, no corrosion fatigue test device for performing thermal-salt-mechanical-water-oxygen five-factor coupling on metal materials exists, and a corresponding test method needs to be established urgently to scientifically evaluate the service performance of metal parts of a power device of marine service equipment and provide a basis for predicting the service life of the metal parts.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a heat-salt-force-water-oxygen coupled corrosion fatigue test device and a method, which comprises a testing machine, a heating jacket, a flask, an oxygen flowmeter, a water vapor flowmeter, a heat-resistant alloy liner, a resistance furnace, a bracket, a first conduit, a second conduit, a temperature measuring instrument, an oxygen measuring instrument, a gas valve and an oxygen bottle; the testing machine comprises a main shaft and a clamp; the resistance furnace is arranged on the bracket and surrounds the clamp to heat the sample; the heat-resistant alloy inner container is arranged in the resistance furnace and used for preventing water vapor from directly contacting with furnace wires of the resistance furnace during a test; the oxygen cylinder releases oxygen and introduces the oxygen to the surface of the sample; after being heated, water in the flask generates steam and is introduced to the surface of the sample; the temperature measuring instrument and the oxygen measuring instrument are used for measuring the temperature and the oxygen content of the area near the surface of the sample so as to realize the accurate regulation and control of the temperature and the oxygen content of the area near the surface of the measured sample; the method can scientifically evaluate the corrosion fatigue failure behavior of the engineering material and the structure under the complex service condition.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a heat-salt-force-water-oxygen coupled corrosion fatigue test device comprises a test machine, a heating sleeve, a flask, an oxygen flow meter, a water vapor flow meter, a heat-resistant alloy liner, a resistance furnace, a support, a first conduit, a second conduit, a temperature measuring instrument, an oxygen measuring instrument, an air valve and an oxygen bottle; the testing machine comprises a main shaft and a clamp;
the fixture is arranged in the middle of the main shaft, the fixture clamps the sample, and the main shaft rotates at a high speed to drive the fixture to perform a fatigue test on the sample;
the resistance furnace is of an open type double-layer shell cylindrical structure, is arranged on the bracket and surrounds the clamp to heat the sample; the resistance furnace can move freely, when a sample needs to be installed or disassembled, the upper cover of the resistance furnace is opened, and the resistance furnace moves backwards to meet the space requirement of installing or disassembling the sample; when the test sample is installed and needs to be heated by the resistance furnace, the resistance furnace is moved forwards, the upper cover is closed, and the locking hook on the resistance furnace is locked to ensure that the position of the resistance furnace is fixed in the test;
the heat-resistant alloy inner container is cylindrical and stepped, and the diameter of the middle part is larger than that of the two end parts; the heat-resistant alloy inner container is arranged in the resistance furnace, and the middle part separates the sample from the resistance furnace and is used for preventing the direct contact of water vapor and furnace wires of the resistance furnace during the test; the two end parts of the heat-resistant alloy inner container surround the main shaft;
the oxygen bottle releases oxygen through a first conduit, the first conduit introduces the oxygen to the surface of a sample from one side inside the heat-resistant alloy liner, and an oxygen flow meter and an air valve are arranged on the first conduit and used for realizing quantitative control of oxygen flow;
the heating sleeve heats the flask, water in the flask generates steam after being heated, the steam is introduced to the surface of the sample from the other side inside the heat-resistant alloy liner through the second conduit, and the second conduit is provided with a steam flowmeter;
the temperature measuring instrument and the oxygen measuring instrument are used for measuring the temperature and the oxygen content of the area near the surface of the sample so as to realize the accurate regulation and control of the temperature and the oxygen content of the area near the surface of the measured sample.
A heat-salt-force-water-oxygen coupled corrosion fatigue test method comprises the following steps:
step 1: processing a sample into a rod shape, wherein the diameter of a working section of the sample is Amm-B mm, and ultrasonically cleaning the sample by using cleaning powder, clear water and absolute ethyl alcohol in sequence and then drying the sample by using a blower;
step 2: coating a layer of salt on the surface of a sample;
and step 3: clamping a sample coated with salt on a testing machine, adjusting the static jumping quantity of a gauge length part of the sample to the specified requirement, and locking to prevent the sample from jumping in the rotating process;
and 4, step 4: adjusting the position of the resistance furnace, and starting the resistance furnace;
and 5: after the display temperature of the temperature instrument to be measured reaches the test temperature, adjusting the temperature of the heating sleeve to the specified temperature, releasing water vapor in the flask, and introducing the water vapor to the surface of the sample; the temperature of the heating sleeve is controlled to control the flow of the water vapor, and the water vapor flow meter is used for monitoring the flow of the water vapor;
step 6: after the flow displayed by the water vapor flow meter is stable, opening and adjusting the air valve to ensure that the oxygen flow reaches a specified value, introducing oxygen to the surface of the sample, and monitoring the oxygen content by an oxygen meter;
and 7: after the oxygen flow is stable, loading weights according to the test requirements, starting the testing machine, and observing and recording the numerical value displayed by the oxygen meter in the test process;
and 8: when the test cycle times reach the set value, the testing machine automatically stops; if the set experiment cycle times are not reached and the sample is broken, the sample falls under the action of gravity, an inductive switch of the testing machine is triggered, and the testing machine stops working; when the testing machine stops, the resistance furnace also automatically stops, then the heating sleeve and the air valve are closed, the supply of water vapor and oxygen is stopped, and the test is finished.
Preferably, in the step 2, a layer of salt is coated on the surface of the sample, and the specific steps are as follows:
step 2-1: measuring the size of the sample by using a vernier caliper, weighing by using an analytical balance and recording the original mass of the sample;
step 2-2: calculating the surface area of the sample according to the size of the sample, and calculating the total salt coating amount of the sample according to the surface area and the unit salt coating amount of the sample;
step 2-3: preparing a salt solution according to a required proportion, dipping the salt solution by a brush, uniformly coating the salt solution on a working section of a sample, drying the sample by cold air, and controlling the surface coating salt amount by comparing the quality before and after salt coating.
Preferably, the testing machine is an cantilever beam type rotational bending fatigue testing machine.
Preferably, a is 4 and B is 6.
Preferably, the rated heating temperature range of the resistance furnace is 200-1000 ℃.
Preferably, the control error of the thermodetector is within +/-1 ℃.
Preferably, the measuring range of the flowmeter is 30-300 mL/min, and the highest pressure can bear 10 kilograms of pressure.
Preferably, the oxygen meter adopts an ion current oxygen meter, the measurement range is 10.00-98.00%, and the measurement precision is less than or equal to +/-1% FS.
Preferably, the salt coating amount of the sample is 0.1-10 mg/cm2. The maximum alternating stress range is 10% -100% of yield strength.
The invention has the following beneficial effects:
the invention can realize the corrosion fatigue test of the metal material under the condition of heat-salt-water-oxygen environmental factor coupling alternating stress, achieve the scientific evaluation of the corrosion fatigue failure behavior of the engineering material and the structure under the complex service condition, reveal the internal action mechanism and provide a test method and means for the safety reliability and service life improvement of marine environmental service equipment.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The device comprises a heating jacket 1, a flask 2, a steam flowmeter 3, a heat-resistant alloy inner container 4, a clamp 5, a resistance furnace 6, a test sample 7, a temperature measuring instrument 8, an oxygen measuring instrument 9, an air valve 10, an oxygen cylinder 11, a main shaft 12, an oxygen flowmeter 13, a first conduit 14 and a second conduit 15.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A heat-salt-force-water-oxygen coupled corrosion fatigue test device comprises a testing machine, a heating sleeve 1, a flask 2, an oxygen flow meter 13, a water vapor flow meter 3, a heat-resistant alloy inner container 4, a resistance furnace 6, a support, a first conduit 14, a second conduit 15, a temperature measuring instrument 8, an oxygen measuring instrument 9, an air valve 10 and an oxygen bottle 11; the testing machine comprises a spindle 12 and a clamp 5;
the fixture 5 is arranged in the middle of the spindle 12, the fixture 5 clamps the sample 7, and the spindle 12 rotates at a high speed to drive the fixture 5 to perform a fatigue test on the sample 7;
the resistance furnace 6 is an open type double-layer shell cylindrical structure, is arranged on the bracket and surrounds the clamp 5 to heat the sample 7; the resistance furnace 6 can move freely, when the sample 7 needs to be installed or disassembled, the upper cover of the resistance furnace 6 is opened, and the resistance furnace 6 moves backwards to meet the space requirement of installing or disassembling the sample 7; when the test sample 7 is installed and needs to be heated by the resistance furnace 6, the resistance furnace 6 is moved forwards, the upper cover is closed, and the locking hook on the resistance furnace 6 is locked, so that the position of the resistance furnace 6 is ensured to be fixed in the test;
the heat-resistant alloy inner container 4 is cylindrical and stepped, and the diameter of the middle part is larger than that of the two end parts; the heat-resistant alloy inner container 4 is arranged in the resistance furnace 6, and the middle part separates the sample 7 from the resistance furnace 6 and is used for preventing the steam from directly contacting with the furnace wires of the resistance furnace 6 during the test; the two end parts of the heat-resisting alloy inner container 4 surround the main shaft 12;
the oxygen bottle 11 releases oxygen through a first conduit 14, the first conduit 14 introduces the oxygen from one side inside the heat-resistant alloy inner container 4 to the surface of the sample 7, and an oxygen flow meter 13 and a gas valve 10 are installed on the first conduit 14 and used for realizing quantitative control of oxygen flow;
the heating jacket 1 heats the flask 2, water in the flask 2 is heated to generate steam, the steam is introduced to the surface of the sample 7 from the other side inside the heat-resistant alloy liner 4 through the second guide pipe 15, and the steam flowmeter 3 is installed on the second guide pipe 15;
the temperature measuring instrument 8 and the oxygen measuring instrument 9 are used for measuring the temperature and the oxygen content of the area near the surface of the sample 7 so as to realize accurate regulation and control of the temperature and the oxygen content of the area near the surface of the sample 7.
A heat-salt-force-water-oxygen coupled corrosion fatigue test method comprises the following steps:
step 1: processing a sample 7 into a rod shape, wherein the diameter of a working section of the sample 7 is 4-6 mm, and ultrasonically cleaning the sample by using cleaning powder, clear water and absolute ethyl alcohol in sequence and then drying the sample by using a blower;
step 2: coating a layer of salt on the surface of a sample 7, and comprises the following specific steps:
step 2-1: measuring the size of the sample 7 by using a vernier caliper, weighing by using an analytical balance and recording the original mass of the sample 7;
step 2-2: calculating the surface area of the sample 7 according to the size of the sample 7, and calculating the total salt coating amount of the sample 7 according to the surface area and the unit salt coating amount of the sample 7;
step 2-3: preparing a salt solution according to a required proportion, dipping the salt solution by a brush to uniformly coat the salt solution on a working section of a sample 7, drying the salt solution by cold air, and controlling the surface coating salt amount by comparing the quality before and after salt coating.
And step 3: clamping the sample 7 coated with salt on a testing machine, adjusting the static jumping quantity of a gauge length part of the sample 7 to the specified requirement, and fully locking to prevent the sample 7 from jumping in the rotating process;
and 4, step 4: adjusting the position of the resistance furnace 6, and starting the resistance furnace 6;
and 5: after the display temperature of the temperature detector 8 to be measured reaches the test temperature, the temperature of the heating sleeve 1 is adjusted to the specified temperature, water vapor is released in the flask 2, and the surface of the sample 7 is filled with the water vapor; the flow of the water vapor is controlled by controlling the temperature of the heating sleeve 1, and the flow meter 3 monitors the flow of the water vapor;
step 6: after the flow displayed by the water vapor flowmeter 3 is stable, opening and adjusting the air valve 10 to ensure that the oxygen flow reaches a specified value, introducing oxygen to the surface of the sample 7, and monitoring the oxygen content by an oxygen meter 9;
and 7: after the oxygen flow is stable, loading weights according to the test requirements, starting the testing machine, and observing and recording the numerical value displayed by the oxygen meter 9 in the test process;
and 8: when the test cycle times reach the set value, the testing machine automatically stops; if the set experiment cycle times are not reached and the sample 7 is broken, the sample 7 falls under the action of gravity, an inductive switch of the testing machine is triggered, and the testing machine stops working; when the testing machine stops, the resistance furnace 6 also automatically stops, then the heating jacket 1 and the gas valve 10 are closed, the supply of water vapor and oxygen is stopped, and the test is finished.
Because the main shaft rotates at a high speed in the test process, and the force application side of the main shaft cannot have any constraint or influence the accuracy of the force, complete sealing cannot be realized between the main shaft and the heat-resistant alloy inner container. Therefore, the invention makes the heat-resisting alloy inner container into a step shape so as to reduce the diameters of the two sides as much as possible. The control of the salt deposition amount on the surface of the sample is implemented by a method of coating with a sodium chloride aqueous solution, the sodium chloride aqueous solution is prepared by using chemically pure sodium chloride and distilled water, and the salt film deposition amount is controlled by a weight change test method. The invention realizes the simultaneous and synchronous steam and oxygen input to the sample by the measures, and can carry out the corrosion fatigue test of the heat-salt-force-water-oxygen five-factor coupling aiming at the sample with the circular cross section of the metal by combining the high-temperature resistance furnace and the salt film coated on the surface of the sample. The invention provides a test method for revealing the corrosion fatigue behavior and the failure mechanism of the metal material under the condition of five factors of heat-salt-force-water-oxygen coupling.
The rated heating temperature range of the resistance furnace is 200-1000 ℃, and the control error of the temperature measurement control device is within +/-1 ℃. Flow ofThe measuring range of the meter is 30-300 mL/min, and the highest pressure can bear 10 kilograms. The oxygen measuring instrument selects ion current, the measuring range is 10.00-98.00%, and the measuring precision is less than or equal to +/-1% FS. The coating amount of the salt is 0.1-10 mg/cm2. The maximum alternating stress range is 10% -100% of yield strength.
The invention has the advantages of meeting the research purpose of corrosion fatigue test in complex environment coupling factors such as different salt deposition amounts, different temperatures, different water gas and oxygen contents and the like in the actual service environment of the simulated engineering equipment parts, and having wide application prospect in the research and development of engine materials and parts.
Claims (10)
1. A heat-salt-force-water-oxygen coupled corrosion fatigue test device is characterized by comprising a testing machine, a heating sleeve, a flask, an oxygen flowmeter, a water vapor flowmeter, a heat-resistant alloy inner container, a resistance furnace, a support, a first conduit, a second conduit, a temperature measuring instrument, an oxygen measuring instrument, an air valve and an oxygen bottle; the testing machine comprises a main shaft and a clamp;
the fixture is arranged in the middle of the main shaft, the fixture clamps the sample, and the main shaft rotates at a high speed to drive the fixture to perform a fatigue test on the sample;
the resistance furnace is of an open type double-layer shell cylindrical structure, is arranged on the bracket and surrounds the clamp to heat the sample; the resistance furnace can move freely, when a sample needs to be installed or disassembled, the upper cover of the resistance furnace is opened, and the resistance furnace moves backwards to meet the space requirement of installing or disassembling the sample; when the test sample is installed and needs to be heated by the resistance furnace, the resistance furnace is moved forwards, the upper cover is closed, and the locking hook on the resistance furnace is locked to ensure that the position of the resistance furnace is fixed in the test;
the heat-resistant alloy inner container is cylindrical and stepped, and the diameter of the middle part is larger than that of the two end parts; the heat-resistant alloy inner container is arranged in the resistance furnace, and the middle part separates the sample from the resistance furnace and is used for preventing the direct contact of water vapor and furnace wires of the resistance furnace during the test; the two end parts of the heat-resistant alloy inner container surround the main shaft;
the oxygen bottle releases oxygen through a first conduit, the first conduit introduces the oxygen to the surface of a sample from one side inside the heat-resistant alloy liner, and an oxygen flow meter and an air valve are arranged on the first conduit and used for realizing quantitative control of oxygen flow;
the heating sleeve heats the flask, water in the flask generates steam after being heated, the steam is introduced to the surface of the sample from the other side inside the heat-resistant alloy liner through the second conduit, and the second conduit is provided with a steam flowmeter;
the temperature measuring instrument and the oxygen measuring instrument are used for measuring the temperature and the oxygen content of the area near the surface of the sample so as to realize the accurate regulation and control of the temperature and the oxygen content of the area near the surface of the measured sample.
2. The thermal-salt-force-water-oxygen coupled corrosion fatigue testing apparatus of claim 1, wherein the testing apparatus is an cantilever beam type rotational bending fatigue testing apparatus.
3. The thermal-salt-force-water-oxygen coupled corrosion fatigue test device according to claim 1, wherein the rated heating temperature range of the resistance furnace is 200-1000 ℃.
4. A thermal-salt-force-water-oxygen coupled corrosion fatigue testing apparatus according to claim 1, wherein the control error of said thermodetector is within ± 1 ℃.
5. The thermal-salt-force-water-oxygen coupled corrosion fatigue test device according to claim 1, wherein the measurement range of the flowmeter is 30-300 mL/min, and the highest pressure can bear 10 kg of pressure.
6. The thermal-salt-force-water-oxygen coupled corrosion fatigue test device of claim 1, wherein the oxygen meter is an ion current oxygen meter, the measurement range is 10.00-98.00%, and the measurement precision is less than or equal to ± 1% FS.
7. A heat-salt-force-water-oxygen coupled corrosion fatigue test method is characterized by comprising the following steps:
step 1: processing a sample into a rod shape, wherein the diameter of a working section of the sample is Amm-B mm, and ultrasonically cleaning the sample by using cleaning powder, clear water and absolute ethyl alcohol in sequence and then drying the sample by using a blower;
step 2: coating a layer of salt on the surface of a sample;
and step 3: clamping a sample coated with salt on a testing machine, adjusting the static jumping quantity of a gauge length part of the sample to the specified requirement, and locking to prevent the sample from jumping in the rotating process;
and 4, step 4: adjusting the position of the resistance furnace, and starting the resistance furnace;
and 5: after the display temperature of the temperature instrument to be measured reaches the test temperature, adjusting the temperature of the heating sleeve to the specified temperature, releasing water vapor in the flask, and introducing the water vapor to the surface of the sample; the temperature of the heating sleeve is controlled to control the flow of the water vapor, and the water vapor flow meter is used for monitoring the flow of the water vapor;
step 6: after the flow displayed by the water vapor flow meter is stable, opening and adjusting the air valve to ensure that the oxygen flow reaches a specified value, introducing oxygen to the surface of the sample, and monitoring the oxygen content by an oxygen meter;
and 7: after the oxygen flow is stable, loading weights according to the test requirements, starting the testing machine, and observing and recording the numerical value displayed by the oxygen meter in the test process;
and 8: when the test cycle times reach the set value, the testing machine automatically stops; if the set experiment cycle times are not reached and the sample is broken, the sample falls under the action of gravity, an inductive switch of the testing machine is triggered, and the testing machine stops working; when the testing machine stops, the resistance furnace also automatically stops, then the heating sleeve and the air valve are closed, the supply of water vapor and oxygen is stopped, and the test is finished.
8. The method for testing corrosion fatigue of the thermal-salt-force-water-oxygen coupling according to claim 2, wherein a layer of salt is coated on the surface of the sample in the step 2, and the specific steps are as follows:
step 2-1: measuring the size of the sample by using a vernier caliper, weighing by using an analytical balance and recording the original mass of the sample;
step 2-2: calculating the surface area of the sample according to the size of the sample, and calculating the total salt coating amount of the sample according to the surface area and the unit salt coating amount of the sample;
step 2-3: preparing a salt solution according to a required proportion, dipping the salt solution by a brush, uniformly coating the salt solution on a working section of a sample, drying the sample by cold air, and controlling the surface coating salt amount by comparing the quality before and after salt coating.
9. The method for testing thermal-salt-force-water-oxygen coupled corrosion fatigue according to claim 2, wherein a-4 and B-6.
10. The method for testing corrosion fatigue of claim 2, wherein the salt coating amount of the sample is 0.1-10 mg/cm2. The maximum alternating stress range is 10% -100% of yield strength.
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