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Method for displaying original crystal boundaries of Fe-Mn-Al-C low density steel

A low-density steel and original grain boundary technology, which is applied in the preparation of test samples, measuring devices, and material analysis through optical means, can solve the difficulty of increasing the grain size of original austenite, prone to mixed crystals, Increase the difficulty of corrosion and other problems to achieve the effect of short time required, corrosion inhibition and obvious erosion effect

Active Publication Date: 2017-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the traditional method of eroding the original grain boundary is used for the erosion process, dark black martensite will appear, which will make it more difficult to distinguish the grain size of the original austenite, and at the same time, the δ-ferrite cannot be well reduced. High-temperature microstructure of the body
In addition, in the process of high temperature deformation, mixed crystal phenomenon is easy to appear under certain deformation temperature and strain rate conditions, which increases the difficulty of corrosion.

Method used

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  • Method for displaying original crystal boundaries of Fe-Mn-Al-C low density steel
  • Method for displaying original crystal boundaries of Fe-Mn-Al-C low density steel
  • Method for displaying original crystal boundaries of Fe-Mn-Al-C low density steel

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Embodiment 1

[0033] This embodiment provides a method for displaying the original grain boundaries of Fe-Mn-Al-C low-density steel, such as figure 1 and figure 2 As shown, the method includes: sampling, high temperature deformation, sample preparation, erosion and observation;

[0034] The method operates in the order of sampling-high temperature deformation-sample preparation-erosion-observation;

[0035] The erosion step includes: immersing the metallographic sample obtained in the sample preparation step in an etchant at a temperature T, with the observation surface facing up, and for an erosion time t, when the surface of the observation surface becomes dark, take it out, and put the metallographic sample The surface of the phase sample is wiped clean, and then the metallographic sample is cleaned and dried; the eroded Fe-Mn-Al-C low-density steel corrosion sample is obtained;

[0036] The etching agent formula is: picric acid 1.6g, shampoo 0.26g, hydrochloric acid 0.06ml, anhydrous...

Embodiment 2

[0051] This embodiment provides a method for displaying the original grain boundaries of Fe-Mn-Al-C low-density steel, such as figure 1 and image 3 As shown, the method includes: sampling, high temperature deformation, sample preparation, erosion and observation;

[0052] The method operates in the order of sampling-high temperature deformation-sample preparation-erosion-observation;

[0053] The erosion step includes: immersing the metallographic sample obtained in the sample preparation step in an etchant at a temperature T, with the observation surface facing up, and for an erosion time t, when the surface of the observation surface becomes dark, take it out, and put the metallographic sample The surface of the phase sample is wiped clean, and then the metallographic sample is cleaned and dried; the eroded Fe-Mn-Al-C low-density steel corrosion sample is obtained;

[0054] The etching agent formula is: picric acid 2.0g, shampoo 0.4g, hydrochloric acid 0.08ml, anhydrous c...

Embodiment 3

[0069] This embodiment is basically the same as Embodiment 1, except that:

[0070] In the high-temperature deformation step, the initial sample is cooled to a deformation temperature of 900°C, and the strain rate is 0.1s -1 compressing said initial sample;

[0071] The erosion temperature T in the erosion step is 68°C, and the erosion time t is 50s;

[0072] The etching agent formula is: picric acid 1.5g, shampoo 0.2g, hydrochloric acid 0.05ml, anhydrous copper sulfate 0.5g, deionized water 200ml.

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Abstract

The invention belongs to the technical field of metallographic detection, and concretely relates to a method for displaying the original crystal boundaries of Fe-Mn-Al-C low density steel. The method comprises the steps of sampling, high temperature deformation, sample preparation and erosion. A Fe-Mn-Al-C low density steel initial sample undergoes the high temperature deformation step to obtain a high temperature deformation sample, the high temperature deformation sample is ground and polished to prepare a metallographic sample, the metallographic sample is etched in an etchant at an etching temperature T for an etching time t, and is taken out when the etched surface becomes dark, and the metallographic sample is washed with alcohol, and is blown until the sample is dry in order to obtain an etched sample. The etched sample is placed under a metallographic microscope to observe the clear original crystal boundaries. The method for displaying the original crystal boundaries of Fe-Mn-Al-C low density steel has the advantages of simplicity in operation, short etching time and good etching effect.

Description

technical field [0001] The invention belongs to the technical field of metallographic detection, and in particular relates to a method for displaying the original grain boundary of Fe-Mn-Al-C low-density steel. Background technique [0002] Steel will undergo dynamic recrystallization during high temperature deformation. As an important softening and grain refinement mechanism, dynamic recrystallization is very important for controlling the deformation structure of steel, improving plastic forming ability, and improving the comprehensive mechanical properties of materials such as strength and plasticity. is of great significance. Observing the original grain state of steel at high temperature, as the most intuitive means of characterization, is particularly important for the control of the microstructure and properties of Fe-Mn-Al-C low-density steel hot-rolled steel sheets and the formulation of processing technology. [0003] Fe-Mn-Al-C low-density steel due to the specia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N21/84
CPCG01N1/32G01N21/84
Inventor 宋仁伯李轩周乃鹏李佳佳
Owner UNIV OF SCI & TECH BEIJING
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