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Method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test

A thermal simulation and performance technology, applied in the field of iron and steel materials, can solve the problems of difficult control of process parameters, inability to collect key data, and inability to accurately realize, and achieve the effect of saving R&D costs and shortening the R&D cycle.

Inactive Publication Date: 2011-03-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the manual operation of this kind of test, various process parameters are not easy to control, especially the parameters that are more important to deformation, such as temperature and time, cannot be accurately realized at all, and it is impossible to collect key data in the process of heating, deformation and cooling

Method used

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  • Method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test
  • Method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test
  • Method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test

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Embodiment 1

[0018] A method for analyzing the structure and performance of a sample after thermal simulation according to the present invention, the main chemical components are: C: 0.13%, Si: 0.25%, Mn: 1.45%, P: 0.018%, S: 0.002 %, Nb: 0.04%, V: 0.050% of the microalloyed steel, the research on the properties of different final rolling temperatures is carried out according to the following steps:

[0019] 1) Process the experimental steel into such as figure 1 In the shape shown, the sample size is Φ10mm×85mm, and it is installed in the sample cavity with the special fixture of the thermal simulation testing machine;

[0020] 2) Raise the sample to 1200°C at a heating rate of 5°C / s on the thermal simulation testing machine, so that various microalloying elements are solid-dissolved into the austenite, and carry out two-stage controlled rolling after holding for 5 minutes;

[0021] 3) First drop to 1050°C at a rate of 5°C / s, and at a strain rate of 1s -1 , Compress the sample with 45% ...

Embodiment 2

[0029] Another method of the present invention that directly uses the sample after thermal simulation to analyze the structure and performance, the main chemical composition is: the main chemical composition is: C: 0.08%, Si: 0.25%, Mn: 1.48%, P : 0.015%, S: 0.003%, Nb: 0.056%, Ti: 0.01%, Ni: 0.22%, Mo: 0.24%, B: 0.001% of low-alloy high-strength steel, the research on the performance of different relaxation time after rolling , proceed as follows:

[0030] 1) Process the experimental steel into such as figure 1 In the shape shown, the sample size is Φ10mm×85mm, and it is installed in the sample cavity with the special fixture of the thermal simulation testing machine;

[0031] 2) Raise the sample to 1250°C at a heating rate of 5°C / s on the thermal simulation testing machine, so that various microalloying elements are solid-dissolved into the austenite, and carry out two-stage controlled rolling after holding for 8 minutes;

[0032] 3) First drop to 1050°C at a rate of 5°C / s...

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Abstract

The invention discloses a method of analyzing product structure and properties by the utilization of samples prepared with thermo-stimulated test. Test steel is heated to 1200-1250 DEG C. in a thermo-simulator system and is kept at the above temperature for 5-10 minutes. Then the test steel is subject to two-stage controlled rolling. The test steel is cooled to 1050-1150 DEG C. at the speed of 3-15 DEG C. / s and is compressed to make the deformation degree thereof reach 20-60% at the strain rate of 1 to 15s<-1>.Then the test steel is cooled to 800-950 DEG C. at the speed of 3-15 DEG C. / s and is recompressed to make the deformation degree thereof reach 20-60% at the strain rate of 1 to 15s<-1>.After that, the test steel is cooled to 200-700 DEG C. at the speed of 1-30 DEG C. / s. The result of the above method is in accord with that of field tests. The method is applicable to the study of the effect of technological parameters such as press quantity, rolling temperature, deformation rate, starting cooling temperature, relaxation time and cooling speed on product properties.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, in particular to a method for directly analyzing the structure and performance of a thermally simulated sample. Background technique [0002] In the field of iron and steel metallurgy, the quality of iron and steel products is mainly reflected by their mechanical properties, and the quality of their properties is determined by the microstructure. These indicators are not only closely related to chemical composition, but also related to heating, rolling and cooling. The stress state in the process has a great relationship with the temperature system, especially factors such as reduction, temperature and cooling stage in the rolling process are crucial, and it is necessary to study the complex relationship between these parameters and the finished product. It is not advisable to test the relationship on the field rolling mill, only to develop a more suitable simulation method. At present, t...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N1/44G01N1/28
Inventor 邱红雷楚觉非赵亚娟范益王端军车马俊王从道刘朝霞
Owner NANJING IRON & STEEL CO LTD
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