CN108398336A - A method of obtaining drawing by high temperature fracture surface of sample - Google Patents
A method of obtaining drawing by high temperature fracture surface of sample Download PDFInfo
- Publication number
- CN108398336A CN108398336A CN201710064819.8A CN201710064819A CN108398336A CN 108398336 A CN108398336 A CN 108398336A CN 201710064819 A CN201710064819 A CN 201710064819A CN 108398336 A CN108398336 A CN 108398336A
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- sample
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- temperature
- fracture
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- 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
-
- 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
- G01N2203/0067—Fracture or rupture
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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
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The present invention provides a kind of method obtaining drawing by high temperature fracture surface of sample, by thermocouple welding in the centre of sample to be tested, sample is heated to 1330~1370 DEG C under vacuum conditions, after keeping the temperature 4~5min, it is cooled to 1190~1210 DEG C with the rate of 2.8~3.2 DEG C/S, after keeping the temperature 55~65s, with 2 × 10‑3/ S rates stretch sample；And experiment process is divided into deformation initial stage, deformation mid-term and deformation later stage three phases and is controlled respectively, deformation mid-term is when sample deformation power after peak by dropping to some force value F, the experiment draft temperature of setting is set to zero, force value F=stipulated standard power F0+ plus frictional force f+ sample local environments external and internal pressure difference Fp, work as F=f+FpWhen, the experiment draft temperature of setting is set to zero, it is specified that reference force F0It is set in 20~50 kilograms.The present invention is easy to operate, can effectively avoid the generation of sample fracture melting phenomenon caused by fracture, is conducive to the research for carrying out microstructure and fracture apperance.
Description
Technical field
The invention belongs to materials hot working field, more particularly to a kind of control method obtaining drawing by high temperature fracture surface of sample.
Background technology
Heat simulating tester is that the various heated, loading processes of material are reproduced using small sample, discloses it in hot-working
The changing rule of organization and performance in the process, a kind of experimental rig of the hot deformation behavior for research material.Currently, using compared with
Extensive heat simulating tester is that sample is passed directly into electric current as resistance to make its heating, and the thermoelectricity by being welded on sample
Even measurement and control into trip temperature.However, when carrying out sample high temperature tension test, necking down, phenomenon of rupture will occur for sample,
In the moment of fracture, in the heating of the incision position of sample and unstable, it is in molten condition to often lead to fracture, destroys fracture group
Form is knitted, subsequent fractograph morphological analysis can not be carried out.For the deficiency of technique, there are no specific, effective solutions
Certainly method.Using the prior art, the fracture surface of sample stretched under the conditions of temperature is lower can be usually obtained, and warm with stretching
The success rate of the promotion of degree, experiment can decline.As for the higher situation of draft temperature, then other equipment and other heating sides are used
Formula, e.g., resistance stove heat.However, in order to more make full use of direct-electrifying make sample heat resistance heating manner advantage, need
A kind of method is developed, occurs melting when being stretched to avoid sample, destroy fracture, reach and obtain drawing by high temperature fracture surface of sample
Purpose.
Invention content
It is an object of the invention to propose a kind of method obtaining drawing by high temperature fracture surface of sample, this method can be to avoid sample
Under the conditions of the resistance heating of direct-electrifying heating, in the melting phenomenon that drawing by high temperature fracture moment generates, acquisition can be realized
The fracture of drawing by high temperature sample, in case subsequent microstructure check analysis, is that tissue of the research material in drawing process becomes
Change and fracture apperance provides advantage.
For this purpose, the technical solution that the present invention is taken is：
A method of drawing by high temperature fracture surface of sample is obtained, specific method is,
(1) use platinum rhodium thermocouple that thermocouple into the measurement and control of trip temperature, to be welded to sample by the method for spot welding
It is connected on the centre position of sample to be tested, the distance the solder joint of galvanic couple between is 0.9~1.1mm；
(2) before testing, it will be vacuumized in the cavity where heat simulating tester sample, prevent the oxidation of sample；
(3) test technology process：Sample is heated to 1330~1370 with the rate of 9~11 DEG C/S under vacuum conditions
DEG C, after keeping the temperature 4~5min, 1190~1210 DEG C are cooled to the rate of 2.8~3.2 DEG C/S, after keeping the temperature 55~65s, with 2 ×
10-3/ S rates stretch sample；
(4) Discrete control of process is tested：According to test requirements document work out parameter experiment program, and by sample by stretch until
The whole process of fracture is divided into deformation initial stage, deformation mid-term and deformation later stage three phases, and sample deformation initial stage is sample by original
The long deformation stage that length is 0.06~1mm that has been stretched, the deformation force of deformation initial stage sample increase rapidly with the increase of deflection
Greatly, the section of sample does not have significant change；Sample deformation mid-term is to drop to 20,000 after the deformation force of sample is increased to peak
The deformation force of the process of gram force, sample first increases with the increase of deflection, is reduced rapidly after reaching some value, sample contracts
Diameter phenomenon, and with the increase of deflection, undergauge phenomenon is more apparent；The sample deformation later stage refers to that force value is maintained at 20 kilograms
Process, the deformation force of sample tend to a stationary value, the generation of the stationary value mainly rub or negative pressure caused by, sample at this time
It is pulled off；Draw out the deformation force change curve of sample during the entire stretching process；
(5) in deformation mid-term stage, sample deformation power is monitored, is declined after sample deformation power passes through peak
When to some force value F, the experiment draft temperature of setting is set to zero, testing machine does not heat sample at this time, but stretches and still exist
It carries out, until off-test；Force value F can determine by system friction f and negative pressure, i.e.,：F=F0+f+Fp
Wherein, F0For stipulated standard power, FpExternal and internal pressure for sample local environment is poor；
Work as F=f+FpWhen, the state of breaking has been presented in sample, is not avoided that the melting phenomenon of sample occurs, therefore, in F
It is reduced to before the sum of system friction f+ negative pressure, the experiment draft temperature of setting is set to zero, it is specified that reference force F0Setting
In 20~50 kilograms.
Beneficial effects of the present invention are：
Drawing process of the present invention by Control experiment material at high temperature, and the wink that will be broken unbroken in sample
Between, stopping carries out resistance heating to sample is to effectively prevent the generation of sample fracture melting phenomenon caused by fracture
A kind of effective method for obtaining drawing by high temperature fracture surface of sample, is conducive to the research for carrying out microstructure and fracture apperance.This method
It is easy to operate, fast.
Description of the drawings
Fig. 1 is that force value changes over time curve graph in sample drawing process.
In figure：1 is deformation initial stage, and 2 be deformation mid-term stage, and 3 be the later stage of deformation.
Specific implementation mode
It is 10 × 120mm of Ф to being welded on size, the interposition of the sample of TBE (threaded both ends) 1. using platinum rhodium thermocouple
It sets, the distance the solder joint of galvanic couple between is 1mm.
2. before experiment, it will be vacuumized in the cavity residing for sample, prevent the oxidation of sample.
3. the indicating value that the vacuum degree and testing machine idle condition that are reached according to experiment are exerted oneself determines frictional force and negative pressure
The force value of generation is 20 kilograms.
4. the technical process of experiment is：Sample is heated to 1350 DEG C with the rate of 10 DEG C/S under vacuum conditions, heat preservation
After 5min, 1200 DEG C of temperature is dropped to the rate of 3 DEG C/S, after keeping the temperature 1min at this temperature, with 2 × 10-3/ S rates will be tried
Sample stretches, and is controlled experiment process according to the technique.
5. being divided into three phases by process control is tested according to the changing value of drawing force.When sample is stretched by original length
1mm is initial stage, and the deformation force of sample is increased to drop to the process of 20 kilograms after peak to be mid-term stage, second
After stage, the process that force value is maintained at 20 kilograms is later stage.After stretcher strain enters mid-term stage, Deformation Monitoring
Power with drawing process variation.According to force value versus time curve (see Fig. 1), force value reaches a peak value first, later
It is rapid to decline, judge whether force value reaches desired value, if not reaching desired value, continues to detect force value variation, if reached
To desired value, then it is further processed.In the present embodiment, when force value show value is 50 kilogram, the experiment of setting is drawn
It stretches temperature and is set to zero, thermal test machine does not heat sample at this time, until off-test.After the test, sample is removed, is obtained
The drawing by high temperature fracture of sample, carries out subsequent detection project.
Claims (1)
1. a kind of method obtaining drawing by high temperature fracture surface of sample, which is characterized in that
(1) use platinum rhodium thermocouple that thermocouple welding into the measurement and control of trip temperature, to be existed to sample by the method for spot welding
The centre position of sample to be tested, the distance the solder joint of galvanic couple between are 0.9~1.1mm；
(2) before testing, it will be vacuumized in the cavity where heat simulating tester sample, prevent the oxidation of sample；
(3) test technology process：Sample is heated to 1330~1370 DEG C with the rate of 9~11 DEG C/S under vacuum conditions, is protected
After 4~5min of temperature, 1190~1210 DEG C are cooled to the rate of 2.8~3.2 DEG C/S, after keeping the temperature 55~65s, with 2 × 10-3/S
Rate stretches sample；
(4) Discrete control of process is tested：Parameter experiment program is worked out according to test requirements document, and by sample by stretching until fracture
Whole process be divided into deformation initial stage, deformation mid-term and deformation later stage three phases, deformation initial stage be sample by original length be stretched
Length is the deformation stage of 0.06~1mm, and the deformation force of deformation initial stage sample is increased rapidly with the increase of deflection, sample
Section does not have significant change；Deformation mid-term is increased to drop to the process of 20 kilograms, examination after peak for the deformation force of sample
The deformation force of sample first increases with the increase of deflection, is reduced rapidly after reaching some value, and undergauge phenomenon occurs in sample, and with
The increase of deflection, undergauge phenomenon are more apparent；It refers to the process of that force value is maintained at 20 kilograms, the deformation force of sample to deform the later stage
Tend to a stationary value, caused by the generation mainly friction or negative pressure of the stationary value, sample is pulled off at this time；Draw out sample
Deformation force change curve during the entire stretching process；
(5) in deformation mid-term stage, sample deformation power is monitored, drops to certain after sample deformation power passes through peak
When one force value F, the experiment draft temperature of setting is set to zero, testing machine does not heat sample at this time, but stretches and still carrying out,
Until off-test；Force value F can determine by system friction f and negative pressure, i.e.,：F=F0+f+Fp
Wherein, F0For stipulated standard power, FpExternal and internal pressure for sample local environment is poor；
Work as F=f+FpWhen, the state of breaking has been presented in sample, is not avoided that the melting phenomenon of sample occurs, therefore, is reduced in F
Before the sum of system friction f+ negative pressure, the experiment draft temperature of setting is set to zero, it is specified that reference force F0It is set in 20~
50 kilograms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064819.8A CN108398336B (en) | 2017-02-05 | 2017-02-05 | Method for obtaining fracture of high-temperature tensile sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064819.8A CN108398336B (en) | 2017-02-05 | 2017-02-05 | Method for obtaining fracture of high-temperature tensile sample |
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| CN108398336A true CN108398336A (en) | 2018-08-14 |
| CN108398336B CN108398336B (en) | 2020-10-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174309A (en) * | 2019-06-12 | 2019-08-27 | 宁波大学 | The sample design method of metal material fracture partial melting under fatigue load |
| CN113215489A (en) * | 2021-05-08 | 2021-08-06 | 昆明理工大学 | High-strength-plasticity low-chromium nickel-saving type duplex stainless steel and stretching preparation method thereof |
| CN114527009A (en) * | 2022-02-09 | 2022-05-24 | 南京钢铁股份有限公司 | Melting and solidifying process control method on thermal simulation testing machine |
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| CN1467901A (en) * | 2003-06-18 | 2004-01-14 | 吴震宇 | Flywheel generating, multifunctional system and manufacturing method and important component included in this system |
| CN2757420Y (en) * | 2004-05-12 | 2006-02-08 | 陈天为 | Cylindrical permanent magnet straight synchronous motor |
| CN102121886A (en) * | 2010-12-21 | 2011-07-13 | 河北钢铁股份有限公司唐山分公司 | Experimental method for detecting hot-charging brittleness of steel |
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| CN1467901A (en) * | 2003-06-18 | 2004-01-14 | 吴震宇 | Flywheel generating, multifunctional system and manufacturing method and important component included in this system |
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| CN102121886A (en) * | 2010-12-21 | 2011-07-13 | 河北钢铁股份有限公司唐山分公司 | Experimental method for detecting hot-charging brittleness of steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110174309A (en) * | 2019-06-12 | 2019-08-27 | 宁波大学 | The sample design method of metal material fracture partial melting under fatigue load |
| CN110174309B (en) * | 2019-06-12 | 2022-02-22 | 宁波大学 | Sample design method for local melting of metal material fracture under fatigue load |
| CN113215489A (en) * | 2021-05-08 | 2021-08-06 | 昆明理工大学 | High-strength-plasticity low-chromium nickel-saving type duplex stainless steel and stretching preparation method thereof |
| CN114527009A (en) * | 2022-02-09 | 2022-05-24 | 南京钢铁股份有限公司 | Melting and solidifying process control method on thermal simulation testing machine |
| CN114527009B (en) * | 2022-02-09 | 2023-07-04 | 南京钢铁股份有限公司 | Method for controlling melting and solidifying process on thermal simulation testing machine |
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| CN108398336B (en) | 2020-10-27 |
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