CN102062743A - Method for testing dynamic phase transition of steel - Google Patents
Method for testing dynamic phase transition of steel Download PDFInfo
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- CN102062743A CN102062743A CN 200910234249 CN200910234249A CN102062743A CN 102062743 A CN102062743 A CN 102062743A CN 200910234249 CN200910234249 CN 200910234249 CN 200910234249 A CN200910234249 A CN 200910234249A CN 102062743 A CN102062743 A CN 102062743A
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Abstract
The invention relates to a method for testing dynamic phase transition of steel, belonging to the technical field of steel tests. The method for testing the dynamic phase transition of steel comprises the steps of: heating a sample to an austenitic area in a vacuum environment by using a hot processing simulating experimental machine and preserving the heat for a period of time; then compressing the sample at a constant deformation speed; acquiring a stress value and a temperature of the whole compressing deformation process; and finally, drawing a temperature-stress change curve for the acquired stress value and the temperature value, and determining the dynamic phase transition temperature of steel on the change curve according to the characteristics points of the stress changing with the temperature. According to the method for testing the dynamic phase transition of the steel, the correspondence between the stress continuous change and the temperature continuous change in the dynamic phase transition of the steel is found through the test, and the dynamic phase transition temperature of the steel is obtained from analyzing the correspondence, therefore, a novel forceful way is provided for researching the phase transition behaviors in the process of rolling the steel and improving the control accuracy of the steel hot rolling.
Description
Technical field
The present invention relates to a kind of steel dynamic phase trasnsition method of testing, belong to the steel performance technical field of measurement and test.
Background technology
In steel hot rolling, need measure the phase transition temperature of steel in high temperature continuous modification cooling procedure exactly, thereby provide reference frame for the setting of steel hot rolling controlled variable.
At present, the method that adopts when measuring the steel dynamic phase trasnsition mainly contains both at home and abroad: 1, dilatometry, be to utilize the hot-working simulation test machine that sample is carried out taking different cooling speed to carry out the constant speed cooling after the thermal deformation, measure the temperature-swell increment change curve of sample, determine each phase transition temperature according to the unique point on this curve; 2, thermal analysis system is after utilizing the hot-working simulation test machine that sample is carried out thermal deformation, and by measuring distortion back sample variation of temperature in cooling procedure, phase transition temperature is determined in the variation of the sample cooling rate that latent heat caused that produces when utilizing phase transformation; 3, metallographic method, be after utilizing the hot-working simulation test machine with the sample thermal deformation, quench after being cooled to a certain temperature continuously with different speed, write down the quenching chilling period simultaneously, utilize the phase-change product of each sample of metallographic observation, thereby judge that the transformation under a certain cooling rate begins temperature and changes end temp; 4, also have methods such as sampling method, electric-resistivity method in addition, differ and carefully state.On the whole, these methods all are that the phase transformation that utilizes the hot-working simulation test machine to carry out behind the deformation of steel is tested, though also there are some defectives simultaneously in each tool advantage.Measuring accuracy as dilatometry and thermal analysis system is not high, and the workload of metallographic method and sampling method is big, and the electric-resistivity method cost is higher.
In addition, in a lot of actual heat processing techniques, the transformation behavior of steel often occurs in behind the high temperature in the continuous modification cooling procedure, to steel dynamic phase trasnsition in the continuous modification cooling procedure behind high temperature, still lacks effective method of testing at present.
Summary of the invention
The technical matters that the present invention solves is: propose a kind of method of testing of utilizing the hot-working simulation test machine can simply accurately measure steel dynamic phase trasnsition in the continuous modification cooling procedure behind high temperature.
In order to solve the problems of the technologies described above, the technical scheme that the present invention proposes is: a kind of steel dynamic phase trasnsition method of testing may further comprise the steps:
1) heating in vacuum is heated to austenitic area with sample with the hot-working simulation test machine in vacuum environment, and is incubated 5-10 minute;
2) compression deformation, with constant rate of deformation compression sample, the rate of deformation scope is 10 with the hot-working simulation test machine
-2/ s～10
-5/ s, the deformation extent scope is 10%～60%, the distortion end temp is below 550 ℃;
3) data acquisition gathers the above-mentioned the 2nd with the hot-working simulation test machine) stress value and temperature value in the whole compression deformation process of step, the data of gathering stress value and temperature value are 300 at least;
4) interpretation of result is to the above-mentioned the 3rd) the step stress value and the temperature value data of gathering draw temperature-stress changing curve, determine the dynamic phase trasnsition transition temperature of steel on this change curve according to the temperature variant unique point of stress.
Steel dynamic phase trasnsition method of testing of the present invention is unexpectedly got in touch STRESS VARIATION in the steel dynamic phase trasnsition and temperature variation, find out that stress continue to change and the corresponding relation of temperature between continuing to change by test, and from analyze this corresponding relation, obtain the dynamic phase trasnsition transition temperature of steel.Theoretical analysis for method of testing of the present invention is as follows: steel progressively are being cooled to the process of normal temperature from the austenitic area temperature, and the tissue of steel generally certain transformation can take place, promptly so-called phase transformation; In addition, the stable phase steel are under certain deformation speed, and resistance of deformation is linear rising the along with decrease of temperature generally.Because the intensity of different phase constitutions is variant, therefore in constant speed compression cooling strain process, it is not linear increasing along with decrease of temperature that the transformation of steel tissue causes resistance of deformation, but individual features appears, such as resistance of deformation descend, the resistance of deformation increase slows down or accelerates, so can determine the generation of steel structural transformation according to these features.
Entire method process of the present invention is simple, and can accurately obtain the dynamic phase trasnsition transition temperature of steel by the mass data analysis, thereby can give security for improving the steel hot rolling control accuracy.In addition, the mensuration that is not both phase transformation of the more existing phase change measuring method maximum of this phase change measuring method is in the process of continuous deformation rather than after distortion finishes, the characteristics of continuous deformation are similar to the hot continuous rolling deformation characteristics of steel reality, so this method of testing will provide a new powerful measure to support for the transformation behavior research of steel in rolling (dynamically) process.
The perfect of above-mentioned steel dynamic phase trasnsition method of testing is: the described the 1st) the firing rate scope in the step is 5 ℃/s～20 ℃/s.
Further improving of above-mentioned steel dynamic phase trasnsition method of testing is: the described the 4th) in the step, described unique point is the point of contact of getting on described change curve, and the dynamic phase trasnsition transition temperature of described steel comprises starting temperature of transformation and phase transformation end temp.
Further improving of above-mentioned steel dynamic phase trasnsition method of testing is: the model of described hot modeling test machine is the gleeble3500 of U.S. DSI company, the described the 4th) adopt the Origin data processing software to draw temperature-stress changing curve in the step.
Description of drawings
Below in conjunction with accompanying drawing steel dynamic phase trasnsition method of testing of the present invention is described further.
Fig. 1 is the technological process curve map of steel dynamic phase trasnsition method of testing of the present invention.
Fig. 2 is that the steel dynamic phase trasnsition method of testing of the embodiment of the invention one is measured temperature-stress curve that draw sample one back;
Fig. 3 is that the steel dynamic phase trasnsition method of testing of the embodiment of the invention two is measured temperature-stress curve that draw sample two backs.
Fig. 4 is that the steel dynamic phase trasnsition method of testing of the embodiment of the invention three is measured temperature-stress curve that draw sample three backs.
Embodiment
Embodiment one
The steel dynamic phase trasnsition method of testing of present embodiment, first selected size be the bloom of 20mm * 15mm * 10mm as sample one, material is Q345C; Selected again hot modeling test machine (model is the gleeble3500 of U.S. DSI company) is as proving installation, and as shown in Figure 1, concrete testing procedure is:
1) on hot modeling test machine, sample is heated to austenitic area (T with the firing rate of 10 ℃/s
ε s1000 ℃), and be incubated 5 minutes;
2) then on hot modeling test machine with 1 * 10
-3The deformation velocity constant speed compression sample one of/s, deformation extent is 20%, distortion end temp (T
ε f) be 545 ℃;
3) collection the above-mentioned the 2nd on hot modeling test machine) stress value and the temperature value in the whole compression deformation process in the step, 310 of the stress value of collection and temperature value data;
4) according to the process data of temperature of gathering in the above test process and stress, utilize Origin data processing software (data analysis and mapping software that U.S. Microcal company is developed) that the stress value and the temperature value data of gathering are drawn temperature-stress changing curve, as shown in Figure 2, on this curve, adopt the method for getting the point of contact to determine starting temperature of transformation Ts and phase transformation end temp T
f
Can find out clearly that by temperature-stress changing curve as shown in Figure 2 the sample one of present embodiment is since 756.52 ℃, stress has departed from original linear track with variation of temperature, when temperature is reduced to below 596.67 ℃, stress is tending towards linear again with variation of temperature, the beginning temperature that can determine this steel grade austenite phase transformation under this test technology condition thus is 756.52 ℃, the austenite phase transformation end temp is 596.67 ℃, it is Ts=756.52 ℃ that austenite phase transformation begins temperature, and the austenite phase transformation end temp is Tf=596.67 ℃.
Embodiment two
The steel dynamic phase trasnsition method of testing and the embodiment one of present embodiment are basic identical, and different is: 1, selected size be Φ 10mm * 15mm round steel as sample two, material is SPA-H; 2, the 1st) firing rate in the step is 5 ℃/s, temperature retention time 7 minutes; 3, the 2nd) deformation extent in the step is 50%, distortion end temp (T
ε f) be 530 ℃; 4, the 2nd) stress value of gathering in the step and temperature value data are 350.
Temperature-stress changing curve that present embodiment is drawn as shown in Figure 3, can find out clearly that by Fig. 3 this sample is 802.12 ℃ of beginnings, stress has departed from original linear track with variation of temperature, when temperature is reduced to below 628.91 ℃, stress is tending towards linear again with variation of temperature, can determine the beginning temperature and the austenite phase transformation end temp of this steel grade austenite phase transformation under this test technology condition thus, it is Ts=802.12 ℃ that austenite phase transformation begins temperature, and the austenite phase transformation end temp is Tf=628.91 ℃.
Embodiment three
The steel dynamic phase trasnsition method of testing and the embodiment one of present embodiment are basic identical, and different is: 1, selected size is that Φ 8mm * conduct of 12mm round steel is as sample three, and material is J55; 2, the 1st) firing rate in the step is 18 ℃/s, temperature retention time 15 minutes; 3, the 2nd) deformation extent in the step is 35%, distortion end temp (T
ε f) be 540 ℃; 4, the 2nd) stress value of gathering in the step and temperature value data are 330.
Temperature-stress changing curve that present embodiment is drawn as shown in Figure 4, can find out clearly that by Fig. 4 this sample is 763.95 ℃ of beginnings, stress has departed from original linear track with variation of temperature, when temperature is reduced to below 598.03 ℃, stress is tending towards linear again with variation of temperature, can determine the beginning temperature and the austenite phase transformation end temp of this steel grade austenite phase transformation under this test technology condition thus, it is T that austenite phase transformation begins temperature
s=763.95 ℃, the austenite phase transformation end temp is T
f=598.03 ℃.
Steel dynamic phase trasnsition method of testing of the present invention is not limited to the described concrete technical scheme of the foregoing description, as: the 1) the 1st) firing rate in the step also can be less than 5 ℃/s or greater than other values of 20 ℃/s; 2) the temperature variant unique point of stress is removed the point of contact of getting temperature-stress changing curve and also can be got this point of inflexion on a curve; 3) hot modeling test machine also can adopt other models; 4) also can utilize other data processing softwares to draw temperature-stress changing curve; Or the like.All employings are equal to the technical scheme of replacing formation and are the protection domain that the present invention requires.
Claims (4)
1. steel dynamic phase trasnsition method of testing is characterized in that: may further comprise the steps:
1) heating in vacuum is heated to austenitic area with sample with the hot-working simulation test machine in vacuum environment, and is incubated 5-10 minute;
2) compression deformation, with constant rate of deformation compression sample, the rate of deformation scope is 10 with the hot-working simulation test machine
-2/ s～10
-5/ s, the deformation extent scope is 10%～60%, the distortion end temp is below 550 ℃;
3) data acquisition gathers the above-mentioned the 2nd with the hot-working simulation test machine) stress value and temperature value in the whole compression deformation process of step, the data of gathering stress value and temperature value are 300 at least;
4) interpretation of result is to the above-mentioned the 3rd) the step stress value and the temperature value data of gathering draw temperature-stress changing curve, determine the dynamic phase trasnsition transition temperature of steel on this change curve according to the temperature variant unique point of stress.
2. according to the described steel dynamic phase trasnsition of claim 1 method of testing, it is characterized in that: the described the 1st) the firing rate scope in the step is 5 ℃/s～20 ℃/s.
3. according to the described steel dynamic phase trasnsition of claim 2 method of testing, it is characterized in that: the described the 4th) in the step, described unique point is the point of contact of getting on described change curve, and the dynamic phase trasnsition transition temperature of described steel comprises starting temperature of transformation and phase transformation end temp.
4. according to the described steel dynamic phase trasnsition of claim 3 method of testing, it is characterized in that: the model of described hot modeling test machine is the gleeble3500 of U.S. DSI company, the described the 4th) adopt the Origin data processing software to draw temperature-stress changing curve in the step.
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|---|---|---|---|
| CN 200910234249 CN102062743B (en) | 2009-11-18 | 2009-11-18 | Method for testing dynamic phase transition of steel |
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|---|---|---|---|
| CN 200910234249 CN102062743B (en) | 2009-11-18 | 2009-11-18 | Method for testing dynamic phase transition of steel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884733A (en) * | 2014-02-25 | 2014-06-25 | 重庆科技学院 | Detection method of structure transformation rule in tempering process |
| CN105548238A (en) * | 2015-12-25 | 2016-05-04 | 江阴法尔胜佩尔新材料科技有限公司 | Non-contact completely-free-recovery part austenite recovery ending temperature measurement system |
| CN105973923A (en) * | 2016-04-30 | 2016-09-28 | 山东大学 | Experiment method of phase transition temperature of copper-based memory alloy micro-area |
| CN106018117A (en) * | 2016-05-16 | 2016-10-12 | 华南理工大学 | Method for measuring isothermal precipitation kinetics curve of carbide |
| CN110320229A (en) * | 2019-07-16 | 2019-10-11 | 东北大学 | A kind of multiphase crystalline grain of steel is grown up and the in-situ characterization experimental method of transformation behavior |
| CN110646461A (en) * | 2018-06-27 | 2020-01-03 | 上海梅山钢铁股份有限公司 | Method for measuring continuous cooling phase transition temperature of ultrathin gauge thickness steel plate |
| CN111157568A (en) * | 2020-01-17 | 2020-05-15 | 江西理工大学 | Method for simply and rapidly measuring volume ratio of two-phase transition of continuous cooling |
| CN112729376A (en) * | 2020-11-27 | 2021-04-30 | 成都先进金属材料产业技术研究院有限公司 | Method for evaluating hot working performance of light high-strength steel |
| CN115372409A (en) * | 2022-08-22 | 2022-11-22 | 中南大学 | Device and method for simultaneously measuring solid-liquid two-phase temperature-change thermal conductivity of phase-change material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5942674A (en) * | 1997-08-04 | 1999-08-24 | Ford Global Technologies, Inc. | Method for detecting oxygen partial pressure using a phase-transformation sensor |
| CN2357329Y (en) * | 1998-08-31 | 2000-01-05 | 唐山钢铁集团有限责任公司 | Tester for phase transformation points |
| CN1100990C (en) * | 1998-09-16 | 2003-02-05 | 中国科学院金属研究所 | High-pressure and high-temperature phase change measuring method |
-
2009
- 2009-11-18 CN CN 200910234249 patent/CN102062743B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884733A (en) * | 2014-02-25 | 2014-06-25 | 重庆科技学院 | Detection method of structure transformation rule in tempering process |
| CN105548238A (en) * | 2015-12-25 | 2016-05-04 | 江阴法尔胜佩尔新材料科技有限公司 | Non-contact completely-free-recovery part austenite recovery ending temperature measurement system |
| CN105973923A (en) * | 2016-04-30 | 2016-09-28 | 山东大学 | Experiment method of phase transition temperature of copper-based memory alloy micro-area |
| CN105973923B (en) * | 2016-04-30 | 2019-04-02 | 山东大学 | A kind of experimental method of copper-based memory alloy microcell phase transition temperature |
| CN106018117A (en) * | 2016-05-16 | 2016-10-12 | 华南理工大学 | Method for measuring isothermal precipitation kinetics curve of carbide |
| 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 |
| CN110646461B (en) * | 2018-06-27 | 2022-05-10 | 上海梅山钢铁股份有限公司 | Method for measuring continuous cooling phase transition temperature of ultrathin gauge thickness steel plate |
| CN110646461A (en) * | 2018-06-27 | 2020-01-03 | 上海梅山钢铁股份有限公司 | Method for measuring continuous cooling phase transition temperature of ultrathin gauge thickness steel plate |
| CN110320229A (en) * | 2019-07-16 | 2019-10-11 | 东北大学 | A kind of multiphase crystalline grain of steel is grown up and the in-situ characterization experimental method of transformation behavior |
| CN111157568A (en) * | 2020-01-17 | 2020-05-15 | 江西理工大学 | Method for simply and rapidly measuring volume ratio of two-phase transition of continuous cooling |
| CN111157568B (en) * | 2020-01-17 | 2022-05-31 | 江西理工大学 | Method for simply and rapidly measuring volume ratio of two-phase transition of continuous cooling |
| CN112729376A (en) * | 2020-11-27 | 2021-04-30 | 成都先进金属材料产业技术研究院有限公司 | Method for evaluating hot working performance of light high-strength steel |
| CN115372409A (en) * | 2022-08-22 | 2022-11-22 | 中南大学 | Device and method for simultaneously measuring solid-liquid two-phase temperature-change thermal conductivity of phase-change material |
| CN115372409B (en) * | 2022-08-22 | 2023-08-25 | 中南大学 | Device and method for simultaneously measuring solid-liquid phase temperature thermal conductivity of phase change material |
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| CN102062743B (en) | 2012-12-12 |
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