CN101793644B - Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode - Google Patents
Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode Download PDFInfo
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- CN101793644B CN101793644B CN2010100179992A CN201010017999A CN101793644B CN 101793644 B CN101793644 B CN 101793644B CN 2010100179992 A CN2010100179992 A CN 2010100179992A CN 201010017999 A CN201010017999 A CN 201010017999A CN 101793644 B CN101793644 B CN 101793644B
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Abstract
The invention discloses a method for carrying out a stress relaxation test on a Gleeble3800 hydraulic wedge unit in a Jaw control mode, which comprises the following steps: welding a thermocouple onto a sample, adopting a K-shaped thermocouple when the heating temperature of the sample is below 1200 DEG C, and adopting an S-shaped thermocouple when the heating temperature of the sample is above 1250 DEG C; respectively spreading a lubricant on a pressure head and the sample to reduce the friction force in compression, and isolating the pressure head and the sample through a tantalum sheet to prevent the pressure head and the sample to react in a high temperature state; opening an air hammer, compacting the sample, controlling the pressure to be about 100Kg, then opening a Gleeble3800 thermal simulation tester and leftwards moving the pressure head to a proper position; carrying out vacuum pumping, and charging Ar gas for protection when the vacuum degree is up to 2.4*10 to 1tau; carrying out compression by adopting the Jaw control mode; and after equipment operation is finished, reserving a high temperature organization state by adopting a direct quenching method, verifying precipitation and recrystallization conditions, and finishing the stress relaxation test. The invention has low cost and high precision and can be used for researching the precipitation behavior of various strain induced precipitates.
Description
Technical field
The present invention relates to a kind of thermal modeling test method, a kind of specifically method with Jaw control model test stress relaxation curve on Gleeble3800 hydraulic wedge unit.
Background technology
In recent years, along with the controlled rolling of Aldecor and the development of control cooling (TMCP) technology, the research of the solid molten and precipitation of microalloy in the thermal deformation austenite being separated out rule just seems all the more important.The method that is used to study deformation induced precipitation process generally includes: (1) transmission electron microscope observation film sample; (2) transmission electron microscope observation extraction replica sample; (3) resistance method of temperature measurement; (4) microhardness method; (5) galvanochemistry extraction etc.All these methods all must keep the condition of high temperature through quenching.Not only workload is big, and measuring accuracy is low, and the stress relaxation method is based on the analysis to stress relaxation data after being out of shape, crystallization kinetics and deformation induced precipitation are separated out behavior again to study static state, have little, the highly sensitive advantage of tested number, and can observe the answer of relaxation and crystallization behavior again.
Stress relaxation test carries out on the common unit of Gleeble hot modeling test machine usually, adopts compilation TAB file executive routine.In compression process, adopt L-GAUGE control model, the sensitivity that can improve data greatly.But on common unit, do stress relaxation test and need process or buy corresponding pressure head and Wedge gripping separately, cost an arm and a leg.Though and there are corresponding pressure head and anchor clamps in the hydraulic wedge unit, because control program is the HDS file, only can use the Stroke control model during compression, thereby precision is relatively poor, be not easy to observe and separate out platform.
Summary of the invention
In order to improve control accuracy, and reduction testing cost, the purpose of this invention is to provide a kind of method of on Gleeble3800 hydraulic wedge unit, carrying out stress relaxation test with the Jaw control model, this method is directly finished the stress relaxation curve test on Gleeble hot modeling test machine hydraulic wedge unit, do not need to buy other accessory again, cost is low; Simultaneously, utilize the Jaw control model to test, improved precision.
The objective of the invention is to be achieved through the following technical solutions:
A kind ofly on Gleeble3800 hydraulic wedge unit, carry out the method for stress relaxation test, it is characterized in that this method directly finishes stress relaxation test on the hydraulic wedge unit, specifically may further comprise the steps with the Jaw control model:
1) thermopair is soldered on the sample, the sample heating-up temperature is adopting K type thermopair below 1200 ℃, adopt S type thermopair more than 1250 ℃;
2) on pressure head and sample, smear lubricant respectively, reduce friction force in compression, and isolate with tantalum piece between pressure head and the sample, prevent that condition of high temperature push-down head and sample from reacting;
3) open air forging hammer, compress sample, Stress Control is opened the Gleeble3800 hot modeling test machine then about 100Kg, pressure head is moved to correct position left;
4) vacuumize, when vacuum tightness reaches 2.4 * 10
-1During τ, fill the Ar gas shiled;
5) adopt the Jaw control model to compress;
6) after the DE device end, adopt direct quenching method to keep high temperature organization state, checking is separated out and crystallization situation again, finishes stress relaxation test.
The present invention directly carries out stress relaxation test with the Jaw control model on Gleeble3800 hydraulic wedge unit, finish the stress relaxation curve test, does not need to buy other accessory again, ten thousand yuan of escapable cost 20-30, and cost is low; Simultaneously, compare common Stroke control model, utilize the Jaw control model to test, improved precision.The present invention can be used for studying various strain inducing precipitates and separates out behavior.
Description of drawings
Fig. 1 is a stress relaxation curve test technology synoptic diagram;
Fig. 2 is that material is the stress relaxation curve figure of Q550D in the embodiment of the invention 1;
Fig. 3 is the softening score curve figure of Q550D among the embodiment 1;
Fig. 4 a is the Jaw change curve that the Jaw control model records among the embodiment 1;
Fig. 4 b is the Jaw change curve that the Stroke control model records among the embodiment 1;
Fig. 5 is that material is the stress relaxation curve figure of E36-T in the embodiment of the invention 2;
Fig. 6 is the softening score curve figure of E36-T among the embodiment 2;
Fig. 7 a is the Jaw change curve that the Jaw control model records among the embodiment 2;
Fig. 7 b is the Jaw change curve that the Stroke control model records among the embodiment 2.
Embodiment
A kind ofly carry out the method for stress relaxation test with the Jaw control model on Gleeble3800 hydraulic wedge unit, stress relaxation test directly carries out on the hydraulic wedge unit.The material that present embodiment is selected for use is Q550D, and deflection is 0.2e, and deformation velocity is 0.1e/s.Specifically may further comprise the steps:
1) thermopair is soldered on the sample, the sample heating-up temperature is adopting K type thermopair below 1200 ℃, adopt S type thermopair more than 1250 ℃;
2) on pressure head and sample, smear lubricant respectively, reduce friction force in compression, and isolate with tantalum piece between pressure head and the sample, prevent that condition of high temperature push-down head and sample from reacting;
3) open air forging hammer, compress sample, Stress Control is opened the Gleeble3800 hot modeling test machine then about 100Kg, pressure head is moved to correct position left;
4) vacuumize, when vacuum tightness reaches 2.4 * 10
-1During τ, fill the Ar gas shiled;
5) adopt the Jaw control model to compress;
6) after the DE device end, adopt direct quenching method to keep high temperature organization state, checking is separated out and crystallization situation again, finishes stress relaxation test.
The stress relaxation that records as shown in Figure 2.Pass through stress relaxation test, as can be seen, separate out the start time all in 10s at 800-900 ℃, and the concluding time is also all in 100s, precipitation is separated out effective the carrying out of crystallization again that stoped, this result with the softening mark of double compression test test is corresponding fully, and the method that the curve that this kind test stress is lax is described is fully feasible.Fig. 3 is the softening score curve figure of Q550D.
The data represented sample that Jaw measures is the axially variation of size in the stress relaxation process, and the stability of Jaw directly influences the accuracy of stress data, and Fig. 4 a is the Jaw change curve that the Jaw control model records; Fig. 4 b is the Jaw change curve that the Stroke control model records.The Jaw situation of change that records by different control models as can be seen, with Jaw control record obviously than stable many of the Jaw that records with Stroke control, its both jitter amplitude is respectively:
The Jaw variation range that obtains by Jaw control is 2.1830-2.1746=0.0084mm;
The Jaw variation range that obtains by Stroke control is 2.2984-2.2818=0.0166mm;
Its precision rises to original 0.0166/0.0084=1.9762 doubly.
Embodiment 2
Another carries out the method for stress relaxation test with the Jaw control model on Gleeble3800 hydraulic wedge unit, stress relaxation test directly carries out on the hydraulic wedge unit.The material that present embodiment is selected for use is E36-T, and deflection is 0.2e, and deformation velocity is 0.1e/s.Concrete steps are identical with embodiment 1.
The stress relaxation that records as shown in Figure 5.Pass through stress relaxation test, as can be seen, separate out the start time all in 10s at 800-900 ℃, and the concluding time is also all in 100s, precipitation is separated out effective the carrying out of crystallization again that stoped, and when arriving 950 ℃, at preceding 20s, separate out and to play the good restraining recrystallization, but As time goes on, that separates out insufficiently causes suppressing weakening of crystallization effect again, and this result with the softening mark of double compression test test is corresponding fully, and the method that the curve that this kind test stress is lax is described again is complete feasible.Fig. 6 is the softening score curve figure of E36-T;
The data represented sample that Jaw measures is the axially variation of size in the stress relaxation process, and the stability of Jaw directly influences the accuracy of stress data, and Fig. 7 a is the Jaw change curve that the Jaw control model records; Fig. 7 b is the Jaw change curve that the Stroke control model records.The Jaw situation of change that records according to different control models as can be seen, the change curve that records with Jaw control is obviously stable many than what record with Stroke control, its both jitter amplitude is respectively:
The Jaw variation range that obtains by Jaw control is 2.1817-2.1762=0.0055mm;
The Jaw variation range that obtains by Stroke control is 2.3879-2.3708=0.0171mm;
Its precision rises to original 0.0171/0.0055=3.1091 doubly.
The present invention directly carries out stress relaxation test with the Jaw control model on Gleeble3800 hydraulic wedge unit, finish the stress relaxation curve test, compares common Stroke control model, utilizes the Jaw control model to test, and has improved precision.
Claims (1)
1. one kind is carried out the method for stress relaxation test with the Jaw control model on Gleeble3800 hydraulic wedge unit, it is characterized in that this method directly finishes stress relaxation test on the hydraulic wedge unit, specifically may further comprise the steps:
1) thermopair is soldered on the sample, the sample heating-up temperature is adopting K type thermopair below 1200 ℃, adopt S type thermopair more than 1250 ℃;
2) on pressure head and sample, smear lubricant respectively, and isolate with tantalum piece between pressure head and the sample, prevent that condition of high temperature push-down head and sample from reacting;
3) open air forging hammer, compress sample, open the Gleeble3800 hot modeling test machine then, pressure head is moved to correct position left;
4) vacuumize, when vacuum tightness reaches 2.4 * 10
-1During τ, fill the Ar gas shiled;
5) adopt the Jaw control model to compress;
6) after the DE device end, adopt direct quenching method to keep high temperature organization state, checking is separated out and crystallization situation again, finishes stress relaxation test.
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| CN2010100179992A CN101793644B (en) | 2010-01-19 | 2010-01-19 | Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode |
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| CN2010100179992A CN101793644B (en) | 2010-01-19 | 2010-01-19 | Method for carrying out stress relaxation test on Gleeble3800 hydraulic wedge unit in Jaw control mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106353178A (en) * | 2016-09-28 | 2017-01-25 | 攀钢集团研究院有限公司 | Gleeble sample loading tool |
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| CN103196939B (en) * | 2013-04-01 | 2015-06-10 | 北京航空航天大学 | Method for measuring critical temperature of high temperature creep crack growth of material |
| CN103604671B (en) * | 2013-11-18 | 2015-07-22 | 内蒙古科技大学 | Sample treatment method for preventing adhesion between sample and pressure head in thermal simulated test machine compression test |
| CN104198671B (en) * | 2014-07-30 | 2016-02-10 | 山西太钢不锈钢股份有限公司 | One realizes multi-pass tandem rolling test method |
| CN106018117B (en) * | 2016-05-16 | 2018-09-14 | 华南理工大学 | A kind of carbide isothermal precipitation kinetic curve method for measuring |
| CN107389445B (en) * | 2017-06-02 | 2020-01-24 | 江阴兴澄特种钢铁有限公司 | Method for evaluating reheat crack sensitivity of material through stress relaxation test |
| CN109580376B (en) * | 2017-09-28 | 2021-05-07 | 上海梅山钢铁股份有限公司 | Method for performing thermal compression test by using thermal simulation testing machine |
| CN112964568B (en) * | 2021-01-18 | 2022-09-30 | 江阴兴澄特种钢铁有限公司 | Method for carrying out high strain rate uniaxial compression test by using L-gauge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068677U (en) * | 1990-02-23 | 1991-01-02 | 大连理工大学 | Cast alloy cold crack stress analyzer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068677U (en) * | 1990-02-23 | 1991-01-02 | 大连理工大学 | Cast alloy cold crack stress analyzer |
Non-Patent Citations (3)
| Title |
|---|
| 杨常春.Gleeble3800热/力学模拟试验机整体设备特性研究.《物理测试》.2007,第25卷(第6期),20-23. * |
| 王昭东等.松弛法研究微合金钢碳氮化物的应变诱导析出行为.《金属学报》.2000,第36卷(第6期),618-621. * |
| 郑芳等.Gleeble3800热模拟试验机在宝钢的典型应用与功能开发.《宝钢技术》.2003,(第5期),29-32，59. * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353178A (en) * | 2016-09-28 | 2017-01-25 | 攀钢集团研究院有限公司 | Gleeble sample loading tool |
| CN106353178B (en) * | 2016-09-28 | 2019-02-15 | 攀钢集团研究院有限公司 | A kind of Gleeble loading tool being less than graphite flake and tantalum piece radius suitable for radius of specimen |
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