CN108107069A - A kind of test method of hot modeling test machine supplement heat rejecter - Google Patents
A kind of test method of hot modeling test machine supplement heat rejecter Download PDFInfo
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- CN108107069A CN108107069A CN201711169570.3A CN201711169570A CN108107069A CN 108107069 A CN108107069 A CN 108107069A CN 201711169570 A CN201711169570 A CN 201711169570A CN 108107069 A CN108107069 A CN 108107069A
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- test machine
- hot modeling
- modeling test
- sample
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
Abstract
The present invention relates to metal material heat processing physical analogy fields.A kind of test method of hot modeling test machine supplement heat rejecter, sample is handled, the head that exposes that high-temperature ceramic is sleeved on to thermocouple is divided, then the positive and negative anodes of thermocouple are connected on to the middle part of sample uniform temperature zone by spot welding machine, two solder joints radially arrange by isothermal level, spot pitch is 1mm, and high-temperature cement is smeared on two solder joints and reinforces solder joint；Radiator cooler is installed in the vacuum cavity of hot modeling test machine；The control program of hot modeling test machine is opened, is modified to the control program of hot modeling test machine；Hot modeling test machine vacuum cavity is opened, the copper fixture of the both ends insertion hot modeling test machine of sample tests sample using the control program of amended hot modeling test machine.
Description
Technical field
The present invention relates to metal material heat processing physical analogy fields.
Background technology
Steel material is a kind of alloy with phase transformation, high temperature microstructure（Austenite）And its transmutation product（Ferrite, pearl
Body of light, bainite and martensite etc.）With different specific volume and the coefficient of expansion, bulk effect is superimposed upon swollen caused by phase transformation
On swollen curve, the linear relationship between swell increment and temperature is destroyed, so as to according to variation shown on thermal dilatometry
It puts to determine phase transition temperature.Transformation temperature is measured using dilatometry on hot modeling test machine, is the CCT songs for establishing steel material
Line（The continuous transition curve of overcooling austenite）Basis, in the expansion curve in measuring overcooling austenite continuous cooling process,
No matter high temperature, low temperature phase change, all with bulk effect, be just present on " temperature-swell increment " curve that dilatometer is measured turn
Break can accurately make the start temperature and end temp of certain phase transition accordingly, by these temperature be depicted in " temperature-when
Between " in the coordinate system of axis, the continuous transition curve of overcooling austenite can be obtained respectively by linking up（CCT curves）.Each
The drafting of " temperature-swell increment " curve all corresponds to the constant cooling speed from austenitizing temperature continuous coo1ing to room temperature
Degree.The detailed drafting of general CCT curve needs be quickly cooled down from the continuous of permanent cooling rate that continuously slowly cool to of permanent cooling rate
The experiment of nearly 20 cooling velocities " temperature-swell increment " curve, process route chart are shown in Fig. 1.Martensitic structure transformation needs depth
Supercooling, therefore MsPoint（Martensitic structure phase transformation starting point）And MfPoint（Martensitic structure phase transformation end point）Test need it is continuous fast
Quickly cooling but obtains.
Hot modeling test machine producer is equipped with high-precision and is radially expanded instrument, and provides specimen size pattern and match
Copper fixture, sample type is dumbbell shaped pole, overall length 75mm, left and right ends head long 34.5mm, diameter of phi 10mm respectively；
The long 6mm in warm area part, diameter of phi 6mm.The L-type quartz pushrod being radially expanded on instrument is clamped in the diametric(al) of Φ 6mm, to measure
The length change amount of continuous coo1ing under radially different cooling rate, finds the phase transformation starting point of each temperature range and phase transformation end point.
The M of steel material under normal circumstancessPoint temperature range is 400 DEG C ~ 200 DEG C, MfPoint temperature is below 300 DEG C.Lead to
Overtesting is tested to find MsPoint and MfIt puts in the range of the temperature test of 400 DEG C ~ room temperature, to be tried with different cooling speed
It tests.It is known that cooling velocity can be reduced with the reduction of temperature during metal material natural cooling, hot modeling test machine passes through
The cooling velocity that copper fixture provides is limited, and the cooling rate of 15 DEG C/below s can be realized from austenitizing temperature continuous coo1ing to room
Temperature, when cooling rate is in 15 DEG C/more than s, for being less than the M of a certain temperaturesPoint or/and MfPoint, only with hot modeling test machine copper fixture
Cooling velocity is unable to reach test request.Such as shown in Fig. 2, the prior art conducted heat using copper fixture can not measure cooling speed
It spends for the M of 40 DEG C/sfPoint（No inflection point occurs）, reason is as shown in figure 3, program presets cooling velocity as 40 DEG C/s, from austenite
When change temperature is cooled to 200 DEG C of temperature sections, actual cooling velocity can also reach default cooling velocity（See it is to overlap on curve）,
Subsequent 200 DEG C of temperature descending sections to room temperature again measure actual temperature lowering curve in Fig. 3 and default cooling song are begun to deviate from 200 DEG C
Line can not keep the constant cooling velocity of 40 DEG C/s at 200 DEG C to room temperature section, this method for just needing to apply supplement heat rejecter makes reality
The cooling velocity on border is consistent with default cooling velocity, to determine MsPoint or/and MfPoint.
The content of the invention
The technical problems to be solved by the invention are：How solving existing hot modeling test machine cannot complete to be more than 15
DEG C/the constant cooling velocities of s from austenitizing temperature continuous coo1ing to room temperature, to measure MsPoint and MfThe problem of point.
The technical solution adopted in the present invention is：A kind of test method of hot modeling test machine supplement heat rejecter, according to as follows
The step of carry out
Step 1: handling sample, the head that exposes that high-temperature ceramic is sleeved on to thermocouple is divided, then by thermocouple
Positive and negative anodes are connected on the middle part of sample uniform temperature zone by spot welding machine, and two solder joints radially arrange by isothermal level, and spot pitch is
1mm smears high-temperature cement reinforcing solder joint on two solder joints；
Step 2: installing radiator cooler in the vacuum cavity of hot modeling test machine, which passes through compression
Inert gas supplement heat rejecter is carried out to sample uniform temperature zone, the inert gas of compression depressurized first by pressure reducing valve, then
Control solenoid valve unlatching makes compressed inert blow to sample uniform temperature zone, controls pressure reducing valve manually to adjust compressed inert
Flow, the valve electric signal of solenoid valve control are connected in the Host Control Interface of hot modeling test machine；
Step 3: opening the control program of hot modeling test machine, modify, cooling down to the control program of hot modeling test machine
Addition makes the control program that solenoid valve is opened in program, makes solenoid valve Open valve in cooling；
Step 4: hot modeling test machine vacuum cavity is opened, by the copper fixture of the both ends insertion hot modeling test machine of sample, and will
The thermocouple being welded on sample is connected on the corresponding thermometric interface of testing machine, is closed vacuum cavity, is vacuumized, use is amended
The control program of hot modeling test machine tests sample.
As a kind of preferred embodiment：In step 1, thermocouple uses K-type thermocouple, and the internal diameter of high-temperature ceramic is
0.3mm。
As a kind of preferred embodiment：Radiator cooler includes inert gas source, is connected to inert gas source outlet
25MPa × 1MPa gas pressure reducers, bi-bit bi-pass 24VDC normal-closed electromagnetic valves, U-shaped gas-guide pipeline, U-shaped gas-guide pipeline go out
Face sample uniform temperature zone, inert gas source are high pure nitrogen or high-purity argon gas to mouth vertically upward.
As a kind of preferred embodiment：The model Gleeble3800 that hot modeling test machine is.
As a kind of preferred embodiment：The air pressure of the outlet of pressure reducing valve is 0.1-0.2MPa.
The beneficial effects of the invention are as follows：The heating function that the present invention has using hot modeling test machine adds an auxiliary
Cooling device, will heat and two kinds of functions of cooling are combined together, and realizes and is cooled down with setting more than 15 DEG C/s cooling rates, has been come
Into in 15 DEG C/more than s cooling rates from austenitizing temperature（High temperature section）The overall process of continuous coo1ing to room temperature cools down, and is achieved Ms
Point and MfThe measure of point.After installing radiator cooler, the action of hardware need to be only manipulated by software program setting, you can
The uniform temperature zone of sample is carried out with whole-process control of the very fast cooling rate from austenitizing temperature continuous coo1ing to room temperature, is greatly met
The requirement of experiment and the promotion of efficiency.
Description of the drawings
Fig. 1 is the process route chart of temperature-swelling capacity test；
Temperature of the Fig. 2 without radiator cooler-swell increment graph；
Fig. 3 cooling velocities are the observed temperature graph of 40 DEG C/s；
Fig. 4 radiator cooler mounting structure schematic diagrams；
Fig. 5 applies temperature-swell increment graph of radiator cooler.
Wherein, in Fig. 1：Ordinate represents temperature, and abscissa represents the time, and ascending diagonal line represents heating rate, horizontal line
It represents soaking time during austenitizing temperature, declines the cooling velocity that oblique line represents different, X represents corresponding cooling speed
Degree.In Fig. 2：Abscissa expression temperature/DEG C, ordinate represents swell increment/mm, expansion when curve represents heating, keeps the temperature, cools down
Measure curve.In Fig. 4：1st, copper fixture, 2, dumbbell shaped pole sample head, 3, copper fixture pairing hole, 4, pagoda connector, 5, electromagnetism
Valve, 6, straight-through nut, 7, gas circuit quick connector, 8, U-shaped gas-guide pipeline, 9, dumbbell shaped pole sample uniform temperature zone, 10, vacuum chamber
Body.In Fig. 5：Abscissa expression temperature/DEG C, ordinate represents swell increment/mm, expansion when curve represents heating, keeps the temperature, cools down
Measure curve.
Specific embodiment
The present invention is further described below in conjunction with specific embodiment, but the present invention is not limited to choose in example below
Steel grade.
Requirement of experiment：Testing material is axle steel EA1N, it is desirable that from austenitizing temperature continuous coo1ing to room temperature, i.e., from 900
DEG C with 40 DEG C/s speed continuous coo1ing to 30 DEG C.
Implementation carries out according to the following steps：
Axle steel EA1N is processed into overall length 75mm dumbbell shaped poles（Left and right ends head long 34.5mm, diameter of phi 10mm respectively；
The long 6mm in uniform temperature zone part, diameter of phi 6mm）；
The high-temperature ceramic of two internal diameter 0.3mm is respectively fitted over the red of K-type thermocouple, on yellow thermocouple, to obstruct thermoelectricity
Contact of the thermo wires exposed part with surrounding metal, then K-type thermocouple is respectively welded to the residence of sample uniform temperature zone by mash welder
Middle position, and radially isothermal level is arranged, and high-temperature cement is smeared to reinforce solder joint in solder joint root.
Start Gleeble3800 hot modeling test machines, the dumbbell shaped pole sample that thermocouple is welded is packed into copper fixture
In, adjustment machine places the position of copper fixture, and the related sample of copper fixture is assemblied in vacuum cavity together, thermocouple is accessed
On thermometric passage TC1.
Radiator cooler is installed on internal thread diameter M40 endoporus at the top of the vacuum cavity：24VDC- Parker solenoid valves
Air inlet end interface mating pagoda connector, by sebific duct and nitrogen decompression valve air gate be connected；24VDC- Parker solenoid valves
Outlet end interface passes through diameter 1/2 ' ' to Threaded Connector Coupling, be connected with straight-through nut；The opposite side of the straight-through nut has outer simultaneously
Screw thread and internal thread, external screw thread M40 are connected from vacuum cavity top outer with its endoporus, internal thread 1/2 ' ', with
PC1204 gas circuits lead directly to quick connector and are connected；The straight-through nut is fixed on 24VDC- Parker solenoid valves at the top of vacuum cavity
On endoporus.Inside vacuum cavity, gas circuit leads directly to quick connector end and the modeling of one section of long 180mm, outer diameter 12mm, wall thickness 2mm
Expect hose connection；Long 480mm, the copper tube of outer diameter 8mm are intercepted, is converted into U-shaped shape, one end is made to access plastic flexible pipe, the other end pair
Quasi- sample samming zone position, and it is fixed on vacuum cavity bottom surface.Above-mentioned plastic flexible pipe forms U-shaped gas-guide pipeline with copper tube.Extremely
This, radiator cooler is ready, as shown in Figure 4.
Drawing 24VDC control signals QUENCH4, QUENCH4 by LOUP-2 interfaces on thermal modeling test machine host can be in heat
It is arbitrarily called in simulation test machine test procedure.QUENCH4 signal wires are connected with 24VDC- Parker solenoid valves, to control
The unlatching of radiator cooler.
This example selects 99.99% high pure nitrogen to select the nitrogen pressure reducing valve of 25 MPa × 1MPa as source of the gas, be mounted on
It is adjusted on High Purity Nitrogen gas cylinder and by nitrogen decompression valve outlet pressure to 0.18MPa.
Vacuum cavity is closed, is evacuated to 1.8 × 10-2torr；Editor's thermal modeling test program, 5 DEG C of heating rate of setting/
S, 900 DEG C of austenitizing temperature, soaking time 10min, the continuous coo1ing cooling rate of austenitizing temperature to room temperature are 40 DEG C/s,
After austenitizing temperature heat preservation program（I.e. continuous coo1ing to room temperature starting point）The program command that QUENCH4 is opened is added, is made
24VDC- Parker solenoid valves are opened, and are realized that high pure nitrogen blows to sample uniform temperature zone, are achieved the purpose that supplement heat rejecter.
Start thermal modeling test program.
After the test, the swell increment parameter of acquisition and temperature are depicted as " temperature-swell increment " curve as shown in figure 5,
It can be clearly seen that from curve, start temperature, that is, M of martensitic structure transformationSPoint is 296 DEG C, martensitic structure transformation
End temp, that is, MfPoint is 184 DEG C；Measured data shows that the method for the invention easily can carry out geneva with very fast cooling rate
The test of body structural transformation temperature spot.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (5)
1. a kind of test method of hot modeling test machine supplement heat rejecter, carries out according to the steps
Step 1: handling sample, the head that exposes that high-temperature ceramic is sleeved on to thermocouple is divided, then by thermocouple
Positive and negative anodes are connected on the middle part of sample uniform temperature zone by spot welding machine, and two solder joint samples radially arrange by isothermal level, spot pitch
For 1mm, high-temperature cement reinforcing solder joint is smeared on two solder joints；
Step 2: installing radiator cooler in the vacuum cavity of hot modeling test machine, which passes through compression
Inert gas supplement heat rejecter is carried out to sample uniform temperature zone, the inert gas of compression depressurized first by pressure reducing valve, then
Control solenoid valve unlatching makes compressed inert blow to sample uniform temperature zone, controls pressure reducing valve manually to adjust compressed inert
Flow, the valve electric signal of solenoid valve control are connected in the Host Control Interface of hot modeling test machine；
Step 3: opening the control program of hot modeling test machine, modify, cooling down to the control program of hot modeling test machine
Addition makes the control program that solenoid valve is opened in program, makes solenoid valve opens solenoid valve in cooling；
Step 4: hot modeling test machine vacuum cavity is opened, by the copper fixture of the both ends insertion hot modeling test machine of sample, and will
The thermocouple being welded on sample is connected on the corresponding thermometric interface of testing machine, is closed vacuum cavity, is vacuumized, use is amended
The control program of hot modeling test machine tests sample.
2. a kind of test method of hot modeling test machine supplement heat rejecter according to claim 1, it is characterised in that：Step 1
In, thermocouple uses K-type thermocouple, and the internal diameter of high-temperature ceramic is 0.3mm.
3. a kind of test method of hot modeling test machine supplement heat rejecter according to claim 1, it is characterised in that：It aids in cold
But device includes inert gas source, the 25MPa × 1MPa gas pressure reducers for being connected to inert gas source outlet, bi-bit bi-pass
24VDC solenoid valves, U-shaped gas-guide pipeline, the upward face sample uniform temperature zone of exit normal of U-shaped gas-guide pipeline, inert gas source are
Nitrogen or argon gas.
4. a kind of test method of hot modeling test machine supplement heat rejecter according to claim 1, it is characterised in that：Thermal simulation
The model Gleeble3800 that testing machine is.
5. a kind of test method of hot modeling test machine supplement heat rejecter according to claim 1, it is characterised in that：Pressure reducing valve
Outlet air pressure be 0.1-0.2MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711169570.3A CN108107069A (en) | 2017-11-22 | 2017-11-22 | A kind of test method of hot modeling test machine supplement heat rejecter |
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| CN201711169570.3A CN108107069A (en) | 2017-11-22 | 2017-11-22 | A kind of test method of hot modeling test machine supplement heat rejecter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305012A (en) * | 2020-06-10 | 2021-02-02 | 上海航空材料结构检测股份有限公司 | Method for measuring titanium/titanium alloy beta phase transition temperature based on dynamic thermal simulator |
| CN112729978A (en) * | 2020-11-24 | 2021-04-30 | 河钢股份有限公司 | Rapid cooling method for compression experiment of Gleeble thermal simulation testing machine |
| CN115821182A (en) * | 2022-12-29 | 2023-03-21 | 北京钢研高纳科技股份有限公司 | Method for determining cooling process window after high-temperature alloy solution heat treatment |
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| CN115821182B (en) * | 2022-12-29 | 2024-04-12 | 北京钢研高纳科技股份有限公司 | Determination method for cooling process window after solution heat treatment of high-temperature alloy |
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Application publication date: 20180601 |