Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method to reveal the original grain boundary of fe-mn-al-c low density steel

A fe-mn-al-c, low-density steel technology, applied in the field of metallographic detection, can solve the problems of increased difficulty in the original austenite grain size, easy occurrence of mixed crystals, increased corrosion difficulty, etc., to achieve the required The effect of short time, corrosion inhibition and erosion effect is obvious

Active Publication Date: 2020-04-10
UNIV OF SCI & TECH BEIJING
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method to reveal the original grain boundary of fe-mn-al-c low density steel
  • A method to reveal the original grain boundary of fe-mn-al-c low density steel
  • A method to reveal the original grain boundary of fe-mn-al-c low density steel

Examples

Experimental program
Comparison scheme
Effect test

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com