CN102269668B - Testing method for performing rapid water quenching on compression test sample - Google Patents
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Abstract
The invention discloses a testing method for performing rapid water quenching on a compression test sample, which comprises the following steps: before testing, dismounting a protection device on a test chamber door and inserting into a corresponding slot; after finishing mounting the test sample, repeatedly performing the vacuumizing and filling process on a test chamber, and filling inert gas to ensure that the pressure of the finally filled gas is -5inHg; in the programming process, enabling a pressure head of a thermal simulation testing machine to retreat 2-4mm after the end of the conventional test, and determining the total operation time t; starting the thermal simulation testing machine, and when the operation time reaches (t-10)s, opening a deflation valve on the test chamber for deflation to normal pressure; and opening the test chamber door and immediately putting the test sample into a beaker containing water, thereby completing the quenching test. The testing method is low in testing cost and simple to operate, and can not damage the equipment, and the accuracy of the test result and the working efficiency of the operator are high. The testing method is suitable for performing the rapid water quenching test on the Gleeble3800 thermal simulation testing machine.
Description
Technical field
The invention belongs to thermal simulation physical test field, more specifically, the present invention relates to a kind of test method of on the Gleeble3800 hot modeling test machine, the compression sample being carried out rapidly shrend.
Background technology
Along with continually developing of hot modeling test machine function, the Physical Metallurgy process of most materials is able to be reproduced at hot modeling test machine, and can provide a large amount of required test figures for the researchist.But for some special test, be inadequate with test figure analysis only, also need to understand the relevant informations such as tissue morphology of material under the high temperature.At present, quenching rapidly is effective, the most the most frequently used a kind of method.Although hot modeling test machine provides corresponding quenching apparatus, equipment operating is miscellaneous, and cooling velocity slow (during the 800-500 ℃ of left and right sides maximum cooling rate be 50 ℃/s), can't obtain the marquench tissue of testing requirements fully, affect test result analysis.If directly water spray cooling, on the one hand easy hardening crack hammering block cause damage of equipment, (greater than 4 hours) are used for the clearness test chamber need to spend the plenty of time on the other hand, and the as easy as rolling off a log vacuum system that causes is malfunctioning, affects the normal use of equipment.If by simple scrap build, the Optimum Experiment process just can be finished rapidly shrend under the prerequisite of damage equipment not, and this will greatly improve hot modeling test machine operator's work efficiency.
Summary of the invention
The problem that exists in order to overcome prior art, the purpose of this invention is to provide a kind of test method that the compression sample is carried out rapidly shrend, the method is not increase on the basis of any equipment, carry out the test of rapidly shrend at the Gleeble3800 testing machine, experimentation cost is low, simple to operate, can not cause any harm to equipment the accuracy of test findings and operator's high efficiency.
The objective of the invention is to be achieved through the following technical solutions:
A kind of test method that the compression sample is carried out rapidly shrend is characterized in that the method comprises following operation steps:
(1) protective device on the test hatch door under the test front dump inserts in the corresponding slot; After test is finished, when opening the test hatch door, can in time open hatch door like this, guarantee within the shortest time, to finish quenching, improve the accuracy of test figure.
(2) install sample after, experimental cabin repeats to vacuumize, stowing operation, the filling inert gas guarantees that final pressure of gas sealed in electric is-5inHg;
When (3) working out test routine, after finishing, conventional test make the thermal modeling test compressing head retreat 2-4mm, and definite total run time t; Increasing pressure head and retreat 2-4mm, mainly is to be easy to open experimental cabin behind the door, and nose pliers takes off sample from pressure head.
(4) start hot modeling test machine, treat to proceed to working time (t-t
0) during s, open the air release on the experimental cabin, exit to normal pressure; t
0For experimental cabin is exitted to the time of normal pressure from-5inHg; Proceed to (t-t in working time
0) during s, open the air release on the experimental cabin, mainly be in order to open hatch door, t
0Be 10s, exit to the time of normal pressure from-5inHg and 10s is experimental cabin.
(5) open the test hatch door, immediately sample is put to the beaker that fills water, finish quenching test, when guaranteeing the quenching quality, experimental cabin is not polluted by hardening media.
Repeating in the setting steps of the present invention (2) vacuumize-and filling mainly is to guarantee that sample is not oxidized, and the poor balance of experimental cabin external and internal pressure simultaneously also is conducive to improve the accuracy of test figure.Final pressure of gas sealed in electric is set to-5mmHg about, mainly can prolong the deflation time of step (4) because arrange excessively, cause sample excessively oxidated; Too small, then cause easily sample hatch door insufficient pressure, cause gas leakage.
The present invention has following advantage:
When (1) utilizing test method of the present invention to test, do not need to add other accessory, experimentation cost is low.
(2) test method of the present invention is simple to operate, can not cause any harm to equipment, and save experimental cabin cleaning link, and work efficiency improves more than 5 times.
When (3) utilizing test method of the present invention to test, the sample mean cooling velocity can reach 250 ℃/s above (1000 ℃ to room temperature), and the test findings accuracy is high.
The present invention just can finish the rapidly shrend test of compression sample under the prerequisite of damage equipment not, can not cause any harm to equipment, work efficiency can improve more than 5 times, and the sample mean cooling velocity can reach 250 ℃/s above (1000 ℃ to room temperature), test findings accuracy height.The present invention is applicable to carry out at the Gleeble3800 hot modeling test machine test of rapidly shrend.
Description of drawings
Fig. 1 is the austenite crystal figure that embodiment 1 obtains.
Fig. 2 is the austenite crystal figure that embodiment 2 obtains.
Fig. 3 is the austenite crystal figure that embodiment 3 obtains.
Embodiment
Below in conjunction with specific embodiment a kind of test method of carrying out rapidly shrend on the Gleeble3800 hot modeling test machine to compressing sample that the present invention relates to is described in further detail.
Testing requirements judges that by observing autstenitic grain size deformation temperature is on the impact of Austenite Dynamic Recrystallization.Want to observe comparatively clearly austenite crystal, must adopt the method for rapidly shrend.The test steel grade is E36, specimen size is Φ 10 * 15mm right cylinder sample, simulation process is: the speed with 10 ℃/s is heated to 1250 ℃ first, insulation 600s makes the abundant solid solution of alloying element, and then the speed with 2 ℃/s is cooled to (1000 ℃ respectively of test temperatures, 950 ℃ and 900 ℃), compress behind the insulation 30s (mainly being in order to make temperature even), predeformation amount is 0.8, and rate of deformation is respectively 1s
-1, rapidly shrend after being out of shape.After utilizing TAB program that Gleeble3800 equipment carries by the technics institution test routine, carry out following steps:
(1) then the protective device on the test hatch door under the test front dump inserts in the corresponding slot;
(2) after sample installed, experimental cabin repeated to vacuumize-stowing operation three times, and filling gas is inert gas, and guarantees that final pressure of gas sealed in electric is-5inHg;
(3) add a statement that makes pressure head retreat 3mm at the procedure epilogue that sets, and calculation procedure total run time t, such as table 1.
(4) starting outfit, working procedure when proceeding to (t-10) s working time to be treated, is opened the air release on the experimental cabin, exits to normal pressure; t
0For experimental cabin is exitted to the time of normal pressure from-5inHg; t
0Get 10s.
(5) open the test hatch door, after the EOP (end of program) to be tested, immediately with the direct clamping sample of nose pliers to the beaker that water is housed, finish quenching test.
By opening the air valve time in special messenger's minute book invention implementation, quenching begins temperature in the process of the test, and the data such as T.T. that cool time and single test are finished see Table 1.
Table 1
| Embodiment | Quenching temperature, ℃ | Program operation T.T., s | Open the air valve time, s | Quenching begins temperature, ℃ | Sample is quenched to room temperature required time, s | Average cooling rate, ℃/s | The test deadline, min |
| 1 | 1000 | 881 | 871 | 973 | 3.3 | 289 | 31 |
| 2 | 950 | 906 | 896 | 928 | 3.1 | 293 | 33 |
| 3 | 900 | 931 | 921 | 887 | 3.1 | 280 | 28 |
As can be seen from the above table, embodiment carries out according to step of the present invention fully, and average cooling rate has reached the rapidly purpose of shrend greater than 280 ℃/s.Single test is finished required time and is about 30min, is far smaller than the required 4h of traditional quenching test, and work efficiency has improved 7 times.
Sample is carried out metallographic observation, and its microstructure is typical quenching structure-lath martensite, with can be observed obvious austenite grain boundary after the picric acid corrosion, sees Fig. 1, and Fig. 2 and Fig. 3, Fig. 1 are the austenite crystal figure that embodiment 1 obtains.Fig. 2 is the austenite crystal figure that embodiment 2 obtains.Fig. 3 is the austenite crystal figure that embodiment 3 obtains.
Experimentation cost of the present invention is low, simple to operate, can not cause any harm to equipment the accuracy of test findings and operator's high efficiency.
Claims (2)
1. one kind to the compression sample test method of carrying out rapidly shrend, it is characterized in that the method comprises following operation steps:
(1) protective device on the test hatch door under the test front dump inserts in the corresponding slot;
(2) install sample after, experimental cabin repeats to vacuumize, stowing operation, the filling inert gas guarantees that final pressure of gas sealed in electric is 5inHg;
When (3) working out test routine, after finishing, conventional test make the thermal modeling test compressing head retreat 2-4mm, and definite total run time t;
(4) start hot modeling test machine, treat to proceed to working time (t-t
0) during s, open the air release on the experimental cabin, exit to normal pressure; t
0For experimental cabin is exitted to the time of normal pressure from 5inHg;
(5) open the test hatch door, immediately sample is put to the beaker that fills water, finish quenching test.
2. the test method that the compression sample is carried out rapidly shrend according to claim 1 is characterized in that: t
0Be 10s.
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| CN102269668B true CN102269668B (en) | 2013-01-02 |
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| CN104237480A (en) * | 2014-08-27 | 2014-12-24 | 南京钢铁股份有限公司 | Test method for obtaining center porosity press-fit critical conditions |
| 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 |
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| CN102851468A (en) * | 2005-04-12 | 2013-01-02 | 新日本制铁株式会社 | Water-cooling method of steel material and steel material obtained by that water-cooling method |
| KR101227213B1 (en) * | 2008-02-27 | 2013-01-28 | 신닛테츠스미킨 카부시키카이샤 | Cooling system and cooling method of rolling steel |
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