Unlock instant, AI-driven research and patent intelligence for your innovation.

Measuring method of austenitic grain size of high-carbon steel

A technology of austenite grains and determination methods, applied in particle size analysis, measuring device, particle and sedimentation analysis, etc., can solve the problems of incomplete application, unsatisfactory etching effect, etc. Effect

Inactive Publication Date: 2018-07-06
MAANSHAN IRON & STEEL CO LTD
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for metal materials of different materials, the chemical etching method is not completely applicable, and sometimes a satisfactory etching effect cannot be obtained.

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
  • Measuring method of austenitic grain size of high-carbon steel
  • Measuring method of austenitic grain size of high-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, the sample is 82B wire, and the test equipment is a VL2000DX-SVF17SP ultra-high temperature laser confocal microscope. The vacuum degree of the ultra-high temperature laser confocal microscope is 10-2Pa, the heating temperature can reach 1700°C, the temperature control accuracy is 0.1°C, the maximum heating rate can reach 1000°C / min, and the maximum cooling rate can reach 100°C / s (He gas cool down).

[0028] The sample is made of 82B wire. The sample is a cylindrical structure with a diameter of 8 mm and a height of 3 mm. One side of the sample is ground and polished, and it is placed in a special crucible for an ultra-high temperature laser confocal microscope. Argon protective atmosphere. Heat the sample to around the austenitizing temperature of 850°C, keep it warm for ten minutes, the grain boundaries gradually become clear, and after the grain boundaries are completely displayed, add a ruler and keep the photo of the sample. Finally, the grain si...

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

No PUM Login to View More

Abstract

The invention discloses a measuring method of the austenitic grain size of high-carbon steel. The measuring method comprises the following steps: S1, putting a sample into a crucible of an ultra-temperature laser confocal microscope, performing vacuumizing, and then, filling inert gas; S2, heating the sample, and performing thermal insulation when the sample is heated to the set temperature untilthe thermal insulation time reaches the set value; and S3, observing the austenitic grain size of the high-carbon steel through the ultra-temperature laser confocal microscope, and measuring the magnitude of the austenitic grain size of the high-carbon steel. The measuring method of the austenitic grain size of the high-carbon steel, disclosed by the invention, has the advantages that the austenitic grain size of the high-carbon steel is directly obtained and observed under high temperature conditions through a high-temperature metallography mode so as to quantitatively evaluate the magnitudeof the grain size, and the accuracy of the evaluation result is high.

Description

technical field [0001] The invention belongs to the technical field of metal material microstructure detection, in particular, the invention relates to a method for measuring the austenite grain size of high carbon steel. Background technique [0002] Austenite is a kind of microstructure in steel, which is generally equiaxed polygonal grains. The size of austenite grains will affect the size and structure of the subsequent microstructure transformation, and then affect the mechanical properties of the material. Austenite in the iron-carbon phase diagram is a high-temperature phase, which exists above the critical point A1 temperature. At room temperature, only the structure after phase transformation during the cooling process of austenite can be observed. The austenite is sufficiently precipitated and ferrite distributed in a network, so the austenite grain size cannot be directly observed at room temperature. Generally, the sample is re-austenitized and rapidly cooled to ...

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 Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/0205
Inventor 杨峥牟祖茂王德宝徐辉
Owner MAANSHAN IRON & STEEL CO LTD