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Method for testing dynamic phase transition of steel

A test method and phase change technology, which is applied in the investigation stage/state change, measuring device, and analysis of materials, etc., can solve the problems of lack of test methods, heavy workload of metallographic and sampling methods, and high cost of resistance methods

Inactive Publication Date: 2011-05-18
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the test accuracy of thermal expansion method and thermal analysis method is not high, the workload of metallographic method and sampling method is large, and the cost of resistance method is relatively high.
[0004] In addition, in many actual thermal processing processes, the phase transition behavior of steel often occurs in the process of continuous deformation and cooling after high temperature, and there is still a lack of effective testing methods for the dynamic phase transition of steel during continuous deformation and cooling after high temperature.

Method used

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  • Method for testing dynamic phase transition of steel
  • Method for testing dynamic phase transition of steel
  • Method for testing dynamic phase transition of steel

Examples

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Embodiment 1

[0022] In the steel material dynamic phase change test method of the present embodiment, the selected size is a steel block of 20mm × 15mm × 10mm as sample one, and the material is Q345C; test equipment such as figure 1 As shown, the specific test steps are:

[0023] 1) Heat the sample to the austenite zone (T εs 1000℃), and keep warm for 5 minutes;

[0024] 2) Then on the thermal simulation test machine with 1×10 -3 / s deformation speed constant speed compression sample 1, the degree of deformation is 20%, the deformation end temperature (T εf ,) is 545°C;

[0025] 3) Stress values ​​and temperature values ​​in the entire compression deformation process in the above-mentioned 2) step are collected on the thermal simulation testing machine, and 310 stress values ​​and temperature value data are collected;

[0026] 4) According to the process data of temperature and stress collected in the above testing process, use Origin data processing software (data analysis and drawin...

Embodiment 2

[0029] The steel dynamic phase change test method of the present embodiment is basically the same as that of the first embodiment, the difference is: 1, the selected size is Φ10mm×15mm round steel as the second sample, and the material is SPA-H; 2, the first) step The heating rate in is 5 ℃ / s, and holding time is 7 minutes; 3, the degree of deformation in the 2nd) step is 50%, and deformation end temperature (T εf ) is 530° C.; 4. There are 350 stress and temperature data collected in step 2).

[0030] The temperature-stress change curve that present embodiment draws is as follows image 3 shown by image 3 It can be clearly seen that the change of stress with temperature deviates from the original linear track when the sample starts at 802.12°C, and when the temperature drops below 628.91°C, the change of stress with temperature tends to be linear again, so it can be determined that the steel The austenite transformation start temperature and the austenite transformation en...

Embodiment 3

[0032] The steel dynamic phase change test method of the present embodiment is basically the same as that of the first embodiment, the difference is: 1. The selected size is Φ8mm×12mm round steel as the third sample, and the material is J55; 2. In the 1st) step The heating rate is 18°C / s, and the holding time is 15 minutes; 3, the degree of deformation in the 2nd) step is 35%, and the deformation end temperature (T εf ) is 540°C; 4. There are 330 stress and temperature data collected in step 2).

[0033] The temperature-stress change curve that present embodiment draws is as follows Figure 4 shown by Figure 4 It can be clearly seen that the change of stress with temperature deviates from the original linear track when the sample starts at 763.95°C, and when the temperature drops below 598.03°C, the change of stress with temperature tends to be linear again, so it can be determined that the steel The starting temperature of austenite transformation and the end temperature o...

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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 isprovided 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 [0001] The invention relates to a steel material dynamic phase change test method, which belongs to the technical field of steel material performance test. Background technique [0002] In the hot rolling of steel, it is necessary to accurately measure the phase transition temperature of the steel in the process of continuous deformation and cooling at high temperature, so as to provide a reference for the setting of the control parameters of the hot rolling of steel. [0003] At present, the methods used in determining the dynamic phase transition of steel at home and abroad mainly include: 1. Thermal expansion method, which uses a thermal processing simulation test machine to thermally deform the sample and then cools it at a constant rate at different cooling rates to measure the temperature of the sample. Temperature-expansion change curve, according to the characteristic points on this curve to determine the phase transition temperature; 2. Thermal analy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02G01N25/20G01N3/00
Inventor 黄绪传韩孝永马植甄
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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