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Method for simultaneously displaying bearing steel austenite grain boundary and transgranular martensite

A technique for simultaneous display of austenite grain boundaries, applied in the field of metallographic preparation, can solve the problems of difficult and cumbersome erosion operations of austenite grain boundaries

Inactive Publication Date: 2014-12-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems that the austenite grain boundary is difficult to corrode and the operation is cumbersome in the study of GCr15SiMn high-carbon chromium bearing steel grain growth experiment, and while showing the austenite grain boundary simply, clearly and accurately, it also shows the The orientation of the tenite and the thickness of the martensite needles provide convenience for solving the relationship between the austenite grain size and the martensite in the austenite grain

Method used

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  • Method for simultaneously displaying bearing steel austenite grain boundary and transgranular martensite
  • Method for simultaneously displaying bearing steel austenite grain boundary and transgranular martensite
  • Method for simultaneously displaying bearing steel austenite grain boundary and transgranular martensite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The GCr15SiMn steel rolling material with pearlite form is selected as the sample. The chemical composition of the GCr15SiMn steel is: C: 1.02%, Si: 0.55%, Mn: 1.07%, Cr: 1.49%, and the treatment method includes the following steps:

[0022] 1. Cut a 10mm×10mm×10mm block sample, set the heating temperature of the grain growth experiment to 1000℃, keep it for 15min, then cool it to 690℃ at 0.5℃ / s, and then quench it.

[0023] 2. Cut the sample in the middle, at 240#, 400#, 600#, 800#, 1000#, 1200# (that is, the particle size is 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh) Coarse grinding on the metallographic sandpaper from coarse to fine. Before replacing the sandpaper, make sure that there is no scratch on the surface of the sample perpendicular to the polishing direction. When replacing the sandpaper, the sample is rotated at an angle of 90°, and finally polished with 1000# sandpaper. After rough grinding, the polished surface of the sample is water-mille...

Embodiment 2

[0028] The GCr15SiMn steel rolling material with pearlite form is selected as the sample. The chemical composition of the GCr15SiMn steel is: C: 1.02%, Si: 0.55%, Mn: 1.07%, Cr: 1.49%, and the treatment method includes the following steps:

[0029] 1. Cut a 15mm×15mm×15mm block sample, set the heating temperature of the grain growth experiment to 1000℃, keep it for 15min, then cool it to 710℃ at 0.5℃ / s, and then quench it.

[0030] 2. Cut the sample in the middle, at 240#, 400#, 600#, 800#, 1000#, 1200# (that is, the particle size is 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh) Coarse grinding on the metallographic sandpaper from coarse to fine. Before replacing the sandpaper, make sure that there is no scratch on the surface of the sample perpendicular to the polishing direction. When replacing the sandpaper, the sample is rotated at an angle of 90°, and finally polished with 1000# sandpaper. After rough grinding, the polished surface of the sample is water-mille...

Embodiment 3

[0035] The GCr15SiMn steel rolling material with pearlite morphology is selected as the sample. The chemical composition of the GCr15SiMn steel is: C: 1.02%, Si: 0.55%, Mn: 1.07%, and Cr: 1.49%. The treatment method includes the following steps:

[0036] 1. Cut a 20mm×20mm×20mm block sample, set the heating temperature of the grain growth experiment to 1100℃, keep it for 15min, then cool it to 710℃ at 0.5℃ / s, and then quench it.

[0037] 2. Cut the sample in the middle, at 240#, 400#, 600#, 800#, 1000#, 1200# (that is, the particle size is 240 mesh, 400 mesh, 600 mesh, 800 mesh, 1000 mesh, 1200 mesh) Coarse grinding on metallographic sandpaper from coarse to fine. Before changing the sandpaper each time, ensure that there is no scratch on the surface of the sample perpendicular to the polishing direction. When replacing the sandpaper, the sample is rotated at an angle of 90°, and finally polished with 1000# sandpaper. After rough grinding, the polished surface of the sample is wat...

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Abstract

The invention discloses a method for simultaneously displaying bearing steel austenite grain boundary and transgranular martensite, and belongs to the technical field of metallographic preparation. The method comprises the steps of firstly, machining steel into block samples with the side length being 10 to 20 mm, raising the temperature of a heating furnace to 1000 to 1100 DEG C, feeding the samples into the heating furnace, keeping the temperature for 5 to 20 min, cooling the heating furnace to 690 to 730 DEG C at the speed of 0.1 to 0.5 DEG C / s after heat preservation, and then performing quenching treatment, secondly, performing rough grinding, fine grinding and polishing treatment on the samples, and finally, preparing 2 to 4 percent nitric acid alcohol solution at normal temperature, dipping polished surfaces of the samples into the nitric acid alcohol solution for 10 to 20 s, washing the samples with water after surfaces of the samples becomes gray white, cleaning the water through alcohol solution, and then drying the surfaces of the samples through a blower. Clear network carbide can be observed through a microscope to be distributed in an initial austenite grain boundary, and meanwhile, martensite in the austenite grain can also be clearly displayed. The method is simple in corrosion process steps, easy to operate, high in stability and clear in eroded effect, and provides convenience for solving the relation between the size of the austenite grain boundary and the transgranular martensite.

Description

Technical field [0001] The invention belongs to the technical field of metallographic preparation, and particularly relates to a method for displaying the austenite grain boundaries of high-carbon chromium bearing steel by using a heat treatment method to prepare a proeutectoid network carbide. Background technique [0002] The austenite grain size and uniformity have an important influence on the mechanical properties of steel. For high-carbon chromium bearing steel, the small original austenite grain size can effectively improve the mechanical properties and fatigue life of the bearing steel. Fine grains can provide more grain boundaries, and the strength of the bearing steel is improved due to grain boundary strengthening; at the same time, bearing steels with uniform and fine austenite grains will get more uniform and fine slab martensite, which can Effectively improve the toughness of bearing steel. In addition, the arrangement of atoms at the grain boundaries is irregular...

Claims

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Application Information

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IPC IPC(8): G01N1/44G01N1/32
Inventor 刘雅政张丹周乐育张朝磊黄超
Owner UNIV OF SCI & TECH BEIJING
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