CN110411883A - A kind of thermal fatigue test apparatus - Google Patents
A kind of thermal fatigue test apparatus Download PDFInfo
- Publication number
- CN110411883A CN110411883A CN201810404409.8A CN201810404409A CN110411883A CN 110411883 A CN110411883 A CN 110411883A CN 201810404409 A CN201810404409 A CN 201810404409A CN 110411883 A CN110411883 A CN 110411883A
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- thermal fatigue
- test apparatus
- fatigue test
- test specimen
- heating coil
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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
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0057—Generation of the force using stresses due to heating, e.g. conductive heating, radiative heating
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- 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
- G01N2203/0224—Thermal cycling
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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
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of thermal fatigue test apparatus, which is characterized in that has heating part, is made of spiral at the heating coil of tubular, for heating to test specimen；Gas cooling portion is alternately distributed on the length direction of the tubular with the heating coil, and has been evenly distributed gas outlet in inside；And sample fixed part, it is used for the fixed test specimen in such a way that the test specimen passes through the inside in the heating coil and the gas cooling portion.Thermal fatigue test apparatus of the invention is easy to operate, the cooling uniform thermal fatigue test apparatus of sample, the heat fatigue surface of surface no-pollution, non-oxidation can be obtained, convenient for subsequent characterization and test (the especially characterization of residual stress), the reliability of the thermal fatigue property evaluation of the materials such as hot die steel is improved.
Description
Technical field
The present invention relates to a kind of thermal fatigue test apparatus more particularly to a kind of thermal fatigue test apparatus of hot die steel.
Background technique
Hot die steel operating condition is mainly characterized by and thermal state metal is intermittent contacts, and will be used after contacting
The media cooling surface such as water, oil, air.Therefore its working condition is repeatedly heated and cooling, and surface structure generates heat repeatedly
Swollen shrinkage bears tension and compression stress repeatedly, face crack finally occurs, i.e. generation thermal fatigue failure.
Thermal fatigue test is to predict the important means of mould steel thermal fatigue life, accurate Characterization heat fatigue cracking, evaluation heat
Fatigue stress development law is the premise accurately prejudged.Currently, domestic and international researcher to the research of mould steel thermal fatigue behavior
There are many reports, and refers to a variety of heat fatigue devices and equipment.Most thermal fatigue test carries out under atmospheric environment,
And the type of cooling is mostly water cooling.Although the test model and the practical military service operating condition of mold are closer to, the thermal oxide on surface
Corrosion is difficult to avoid that leading to subsequent fire check statistics, there are errors, and the pollution layer on surface can also produce its stress distribution
It is raw to influence.These all can generate certain puzzlement to the evaluation of subsequent thermal fatigue property, and research process is especially made to complicate and miss
Differenceization.
In patent document 1 (CN103926163A), a kind of air cooling thermal fatigue test apparatus with vacuum chamber is provided.It is main
Be used to test during the military services such as nuclear fusion inner wall surface, engine inner wall surface be subjected to circulating temperature variation surface heat it is tired
Labor performance.The thermal fatigue test apparatus of patent document 1 uses vacuum protection to realize air cooling, in order to obtain higher cooling
Speed and sample surfaces are directly blown using inert gas, so as to shorten the thermal fatigue test period.However, the heat of patent document 1 is tired
Labor experimental rig must be vacuumized first, be re-filled with protective gas, then just be can be carried out thermal fatigue test, need to sample repeatedly into
In the case where row observation, cause experimental implementation cumbersome.In addition, the thermal fatigue test apparatus of patent document 1 uses single spout
Top-jet-type air cooling, be easy to cause sample different location jet uneven, cooling velocity is different.
Summary of the invention
The present invention is exactly to complete in view of the above problems, it is intended that providing, one kind is easy to operate, sample is cooling equal
Even thermal fatigue test apparatus is convenient for subsequent characterization and test to obtain the heat fatigue surface of surface no-pollution, non-oxidation
(the especially characterization of residual stress) improves the reliability of the thermal fatigue property evaluation of the materials such as hot die steel.
Thermal fatigue test apparatus of the invention has: heating part, is made of spiral at the heating coil of tubular, for pair
Test specimen is heated；Gas cooling portion is alternately distributed on the length direction of the tubular with the heating coil, and
Gas outlet has been evenly distributed in inside；And sample fixed part, it is used to pass through the heating coil with the test specimen
And the fixed test specimen of mode of the inside in the gas cooling portion.
Preferably, on the length direction of the tubular, the length in the gas cooling portion is greater than the heating coil
Length.
According to the present invention, the heating coil is alternately distributed with the gas cooling portion, therefore, is carried out to test specimen
After heating, all positions being heated can be cooled down.Also, it is evenly distributed on the inside of the gas cooling portion
There is gas outlet, therefore, jet angle can be made more evenly, the cooling velocity of sample different location is closer.In addition, to described
During test specimen carries out thermal fatigue test, i.e., in heating process and cooling procedure, supplied incessantly by gas outlet
Protective gas is in the position being heated always under the atmosphere of protective gas, the cumbersome operation such as therefore, there is no need to vacuumize
Also the heat fatigue surface of surface no-pollution, non-oxidation can be obtained, and then can be improved the heat fatigue of the materials such as hot die steel
The reliability of performance evaluation.
Preferably, the heating coil is induction coil, is heated by electromagnetic induction to the test specimen.This
When, since the gas cooling portion can be made of the material that can not be heated by electromagnetic induction, induction coil will not
Cooling end is heated, will not wasted heat, and guarantee cooling effect.
Preferably, the sample fixed part is made of the first abutting member and the second abutting member, and described first abuts structure
Part and second abutting member are arranged point-blank, the test specimen be clamped in first abutting member with
Between second abutting member.It is further preferred that first abutting member and second abutting member are configured to
It can be located remotely from each other on the direction of the straight line or closely move, and can be fixed in defined position.By
The position of this first abutting member according to the size adjusting of test specimen and second abutting member.
In addition, thermal fatigue test apparatus of the invention can also have vacuum (-tight) housing, the heating part, the sample are fixed
Portion and the gas cooling portion are arranged on the inside of the vacuum (-tight) housing.As a result, the number of fatigue test it is more, be not required to
It to sample repeatedly in the case where being observed, the protection against oxidation to test specimen is realized using vacuum (-tight) housing, reduce protect as a result,
Protect the usage amount of gas.
Detailed description of the invention
Fig. 1 is the perspective view of thermal fatigue test apparatus of the present invention.
Fig. 2 is the cross-sectional view of heating coil.
Fig. 3 is to carry out heat fatigue using the thermal fatigue test apparatus and conventional thermal fatigue test apparatus of the embodiment of the present invention 2
The surface macrograph of test specimen after test.
Fig. 4 is to carry out heat fatigue examination using 2 thermal fatigue test apparatus of the embodiment of the present invention and conventional thermal fatigue test apparatus
The surface fire check figure of test specimen after testing.
Symbol description
1 intake valve, 2 vacuum (-tight) housings, 3 top apertures, thimble on 4,5 protection gas gas sources, 6 loading lines, 7 heating coils, 8 draw
Line, 9 leads, binding post on 10,11 lower binding posts, 12 test specimens, 13 lower thimbles, 14 cover bottom left hole, 15 cover bottom right hole, under 16
Pedestal, 17 vent valves, 18 exhaust collections and processing unit, 19 extraction valves, 20 pumped vacuum systems, 21 gas outlets.
Specific embodiment
Hereinafter, referring to attached drawing, description of specific embodiments of the present invention.
As shown in Figure 1, thermal fatigue test apparatus of the invention is equipped with atmosphere protection device, mainly by vacuum (-tight) housing 2, inflation
System (protection gas gas source 5, loading line 6), pumped vacuum systems 20 and exhaust collection and processing system 18 form.Vacuum (-tight) housing 2
Top is connected with inflation system, and bottom is respectively connected to exhaust collection and processing system via cover bottom left hole 14, cover bottom right hole 15
18, pumped vacuum systems 20, inflation system, pumped vacuum systems and exhaust collection and processing system are mounted on valve (intake valve
1, vent valve 17, extraction valve 19) control on-off, the side of vacuum (-tight) housing 2 be equipped with the upper binding post 10 that connects to power supply and under
Binding post 11, spiral are connect with upper binding post 10 and lower binding post 11 at the heating coil 7 of tubular via lead 8,9 respectively.
The upper and lower end face of the inside of vacuum (-tight) housing 2 is mounted on pedestal, be used to support thimble 4 (the first abutting member) and under
Thimble 13 (the second abutting member) is to fix test specimen 12.Upper thimble 4 is located in a straight line with lower thimble 13, can be straight at this
It is located remotely from each other on the direction of line or closely moves, and can be fixed in defined position.Thus, it is possible to according to examination
The size of sample 12 is tested to adjust the position of upper thimble 4 and lower thimble 13, and then the phase of Control experiment sample 12 and heating coil 7
To position.
Heating coil 7 is induction coil, is heated by electromagnetic induction to test specimen 12.
As shown in Fig. 2, gas cooling portion heating coil 7 alternately divides on the length direction of the spiral tubular of heating coil 7
Cloth.That is, in cross-sectional view shown in Fig. 2, heating coil 7 and gas cooling portion are distributed alternately laminatedly, and heating coil 7 is in tubular
Length direction in the two sides of each section be provided with gas cooling portion.Gas cooling portion has been evenly distributed out in inside
Port 21.Gas cooling portion is connect via loading line 6 with protection gas gas source 5, is sprayed and is protected to test specimen via gas outlet 21
Gas is protected, to protect and cooling test sample 21.
In addition, as shown in Figure 1, test specimen 21 is clamped between thimble 4 and lower thimble 13, and pass through heating coil
7 with the inside in gas cooling portion.
In addition, thus, it is possible to keep gas as shown in Fig. 2, gas cooling portion is connect via multiple air inlet pipe with loading line 6
The jet amount of the various pieces of body cooling end is identical, keeps the cooling velocity of each section of test specimen 12 identical.
In the present invention, it can also be not provided with atmosphere protection device, and constantly supplied by the gas outlet in gas cooling portion 21
Carry out protection test sample 12 to protective gas.In addition, a clamping components also can be set as sample fixed part in the present invention.
The effect of thermal fatigue test apparatus of the invention is illustrated by the following examples.
Embodiment 1
It is less for test number (TN), and need that the case where laboratory sample is observed will be removed every heat cycles several times
Under, for the ease of sampling operation repeatedly, vacuum (-tight) housing can not be used, protective gas is directly sprayed to sample come real by ventilation coil
Now to the protection against oxidation of sample, the trouble vacuumized repeatedly is avoided.Detailed process is as follows.With common aluminium alloy casting die
Tool steel SKD 61 is test specimen, and test specimen is fixed in heating coil using upper thimble and lower thimble, passes through adjusting
The position of upper thimble and lower thimble, by test specimen as the centre of heating coil.Intake valve is opened, via gas cooling portion
Tuned port injection protective gas (nitrogen or argon gas), and low pressure jet state is kept, in test specimen inside heating coil
Around build localised protection gas atmosphere.Then it is powered to heating coil, heats 5s, test specimen is made to be warming up to 650 DEG C,
Then stop heating and increases admission pressure, high pressure air cooling 15s.The process of heating and cooling is repeated, until required
Cycle-index until.It cuts off the power, takes out sample.In the case where without using vacuum protector, convenient for sample during test
The handling repeatedly of product are observed, but due to being long-term jet state, so the consumption for protecting gas is larger.
Embodiment 2
It is larger for test number (TN), in the case where not needing to sample repeatedly and being observed, it is recommended to use vacuum (-tight) housing comes real
Now to the protection against oxidation of sample.Detailed process is as follows: being test specimen with Aluminium Alloys in Common Use die casting steel SKD 61, makes
Test specimen is fixed in heating coil with thimble and lower thimble, by adjusting the position of upper thimble and lower thimble, will be tried
Sample is tested as the centre of heating coil.Intake valve and exhaust valve are closed, extraction valve and pumped vacuum systems are opened, by vacuum (-tight) housing
It is inside pumped to vacuum state, closes extraction valve and pumped vacuum systems.Intake valve is opened, is filled with via the air inlet in gas cooling portion
Protective gas (nitrogen or argon gas) to the pressure in vacuum (-tight) housing then opens exhaust valve up to 1 atmospheric pressure, and logical to heating coil
Electricity heats 5s, test specimen is made to be warming up to 650 DEG C, then stops heating and opening intake valve, high pressure air cooling 15s.It is repeated
Heating and cooling process, until required cycle-index (for example, 100 times).It cuts off the power, to outer gas in vacuum (-tight) housing
All valves are closed after flattening weighing apparatus, take out sample.
Macroscopical sample topography of 61 steel of SKD after 100 circulations gives unprotect gas as shown in a of Fig. 3
Conventional heat fatigue sample macro morphology (b of Fig. 3).As shown in figure 3, carrying out thermal fatigue test using the device of the invention
The finish and total quality of test specimen are above the test specimen that thermal fatigue test is carried out using conventional equipment.Fig. 4 is to adopt
The fire check microscopic appearance on the test specimen surface after thermal fatigue test is carried out with two kinds of thermal fatigue test apparatus, wherein a of Fig. 4
For the test specimen tested using the device of the invention, the b of Fig. 4 is the test that thermal fatigue test is carried out using conventional equipment
Sample.As shown in figure 4, carrying out the micro-crack pattern of the test specimen of thermal fatigue test more using thermal fatigue test apparatus of the present invention
Clearly, be more convenient for observation and subsequent analysis.
Embodiments of the present invention are illustrated above, but embodiment is illustrative only, and do not have limit
Determine the intention of the scope of the invention.These embodiments can be implemented by other various forms, without departing from present subject matter
Various omissions, displacement, change, combination are carried out in range.These embodiments and its deformation are included in the scope of the invention
While in purport, it is also contained in the invention recorded in claims and the range impartial with it.
Claims (7)
1. a kind of thermal fatigue test apparatus, which is characterized in that have:
Heating part is made of spiral at the heating coil of tubular, for heating to test specimen；
Gas cooling portion is alternately distributed on the length direction of the tubular with the heating coil, and inside equably
Gas outlet is distributed with；And
Sample fixed part is used to pass through the inside in the heating coil and the gas cooling portion with the test specimen
The fixed test specimen of mode.
2. thermal fatigue test apparatus according to claim 1, which is characterized in that
On the length direction of the tubular, the length in the gas cooling portion is greater than the length of the heating coil.
3. thermal fatigue test apparatus according to claim 1, which is characterized in that
The heating coil is induction coil, is heated by electromagnetic induction to the test specimen.
4. thermal fatigue test apparatus according to claim 1, which is characterized in that
The sample fixed part is made of the first abutting member and the second abutting member,
First abutting member and second abutting member are arranged point-blank,
The test specimen is clamped between first abutting member and second abutting member.
5. thermal fatigue test apparatus according to claim 4, which is characterized in that
First abutting member and second abutting member are configured to be located remotely from each other on the direction of the straight line
Or it closely moves, and can be fixed in defined position.
6. thermal fatigue test apparatus according to claim 1, which is characterized in that
Vacuum (-tight) housing is also equipped with,
The heating part, the sample fixed part and the gas cooling portion are arranged on the inside of the vacuum (-tight) housing.
7. thermal fatigue test apparatus described in any one of -6 according to claim 1, which is characterized in that
During carrying out thermal fatigue test to the test specimen, the gas cooling portion is constantly supplied via the gas outlet
To protective gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810404409.8A CN110411883B (en) | 2018-04-28 | 2018-04-28 | Thermal fatigue test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810404409.8A CN110411883B (en) | 2018-04-28 | 2018-04-28 | Thermal fatigue test device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110411883A true CN110411883A (en) | 2019-11-05 |
| CN110411883B CN110411883B (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810404409.8A Active CN110411883B (en) | 2018-04-28 | 2018-04-28 | Thermal fatigue test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021128138A (en) * | 2020-02-14 | 2021-09-02 | 北京科技大学 | Original position test device and method for reaction behavior of fireproof material under stress |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU691731A1 (en) * | 1978-03-20 | 1979-10-15 | Институт Проблем Прочности Ан Украинской Сср | Apparatus for testing thermal stability of materials |
| JPH0688778A (en) * | 1992-09-08 | 1994-03-29 | Shimadzu Corp | Thermal fatigue testing machine |
| JPH09196836A (en) * | 1996-01-23 | 1997-07-31 | Shimadzu Corp | Thermal fatigue testing machine |
| CN102274955A (en) * | 2011-07-25 | 2011-12-14 | 阳谷祥光铜业有限公司 | Nitrogen protective oxygen-insulated whole-course quick cooling casting process and system for anode plates |
| CN103926163A (en) * | 2014-04-10 | 2014-07-16 | 北京工业大学 | System and method for thermal fatigue test by induction heating and air cooling |
| JP2018063247A (en) * | 2016-10-07 | 2018-04-19 | 日立金属株式会社 | Material tester and material testing method |
-
2018
- 2018-04-28 CN CN201810404409.8A patent/CN110411883B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU691731A1 (en) * | 1978-03-20 | 1979-10-15 | Институт Проблем Прочности Ан Украинской Сср | Apparatus for testing thermal stability of materials |
| JPH0688778A (en) * | 1992-09-08 | 1994-03-29 | Shimadzu Corp | Thermal fatigue testing machine |
| JPH09196836A (en) * | 1996-01-23 | 1997-07-31 | Shimadzu Corp | Thermal fatigue testing machine |
| CN102274955A (en) * | 2011-07-25 | 2011-12-14 | 阳谷祥光铜业有限公司 | Nitrogen protective oxygen-insulated whole-course quick cooling casting process and system for anode plates |
| CN103926163A (en) * | 2014-04-10 | 2014-07-16 | 北京工业大学 | System and method for thermal fatigue test by induction heating and air cooling |
| JP2018063247A (en) * | 2016-10-07 | 2018-04-19 | 日立金属株式会社 | Material tester and material testing method |
Non-Patent Citations (1)
| Title |
|---|
| LIU-HO CHIU: "thermal fatigue behavior of nitrocarburized and low pressure nitrided modified JIS SKD61 hot work mold steel", 《MATERIALS TRANSACTIONS》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021128138A (en) * | 2020-02-14 | 2021-09-02 | 北京科技大学 | Original position test device and method for reaction behavior of fireproof material under stress |
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| CN110411883B (en) | 2022-07-12 |
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