Metallographic etched process for displaying G Cr15 original austenite grain border

A technology of austenite grain and metallographic corrosion, applied in the field of heat treatment, can solve problems such as difficulties, cumbersome methods, unsatisfactory results, etc., and achieve the effect of good reproducibility and time saving

Inactive Publication Date: 2008-05-28
LUOYANG BEARING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Over the years, heat treatment workers and researchers at home and abroad have done a lot of work on the influence of the original austenite grain size of GCr15 bearing steel on the strength, toughness and fatigue life of the steel, and have also achieved a lot of research results. What kind of metallographic corrosion method to display the original austenite gr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) The sample is subjected to rough grinding, fine grinding, polishing, cleaning and drying in accordance with conventional methods in the quenched and tempered state;

[0036] 2) Immerse the prepared sample in the etchant and corrode for 2 minutes. The corroded surface of the sample should be placed upwards and constantly stirred or wiped with cotton to make the corrosion uniform until the corroded surface turns silver gray;

[0037] 3) Rinse the corroded sample with flowing water, and clean and dry it with 95% alcohol;

[0038] 4) If the sample corrodes excessively, add W0.5-1.0 polishing paste or W0.5-1.0 metallographic polishing agent to the silk polishing cloth for slight polishing by hand, and then use 95% alcohol to clean and blow it. Dry;

[0039] 5) For the determination of grain size, according to the actual situation, the method of picture comparison, grid method, intercept method and quantitative metallurgy can be selected for evaluation according to releva...

Embodiment 2

[0042] 1) The sample is subjected to rough grinding, fine grinding, polishing, cleaning and drying in accordance with conventional methods in the quenched and tempered state;

[0043] 2) Immerse the prepared sample in the etchant and corrode for 3 to 4 minutes. The corroded surface of the sample should be placed upwards and constantly stirred or wiped with cotton to make the corrosion uniform until the corroded surface turns silver gray;

[0044] 3) Rinse the corroded sample with flowing water, and clean and dry it with 95% alcohol;

[0045] 4) If the sample corrodes excessively, add W0.5-1.0 polishing paste or W0.5-1.0 metallographic polishing agent to the silk polishing cloth for slight polishing by hand, and then use 95% alcohol to clean and blow it. Dry;

[0046] 5) For the determination of grain size, according to the actual situation, the method of picture comparison, grid method, intercept method and quantitative metallurgy can be selected for evaluation according to r...

Embodiment 3

[0049] 1) The sample is subjected to rough grinding, fine grinding, polishing, cleaning and drying in accordance with conventional methods in the quenched and tempered state;

[0050] 2) Immerse the prepared sample in the etchant and corrode for 5 minutes. The corroded surface of the sample should be placed upwards and constantly stirred or wiped with cotton to make the corrosion uniform until the corroded surface turns silver gray;

[0051] 3) Rinse the corroded sample with flowing water, and clean and dry it with 95% alcohol;

[0052] 4) If the sample corrodes excessively, add W0.5-1.0 polishing paste or W0.5-1.0 metallographic polishing agent to the silk polishing cloth for slight polishing by hand, and then use 95% alcohol to clean and blow it. Dry;

[0053] 5) For the determination of grain size, according to the actual situation, the method of picture comparison, grid method, intercept method and quantitative metallurgy can be selected for evaluation according to releva...

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PUM

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Abstract

A metallographic corrosion method for displaying a GCr15 original austenitic grain boundary comprises adding picric acid 5g into distilled water100ml and mixing continuously, then adding sodium dodecyl benzene sulfonate 5ml 50% and mixing, finally adding ferric chloride 2g, and using after placing for 24 hours. A sample is grinded roughly, grinded finely, polished, cleared, dried, immersed into caustic erodent for 2-5 minutes according to normal method under a quenching tempering condition until etched surface is changed into silver grey, cleaned up through flowing water, cleaned with alcohol 95%, and dried. If the sample is over-corroded, polishing paste W0.5-1.0 or metallographic polishing egent0.5-1.0 is added on silk polishing cloth, the sample is polished slightly with hands, then cleaned with alcohol 95%, and dried. According to practical condition, grain granularity measurement can adopt methods of picture contrast, grid, intercept, quantitative metallography, and the like, to assess according to relevant standards.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, in particular to a metallographic corrosion method for displaying GCr15 original austenite grain boundaries. Background technique [0002] The austenite grain refinement of steel can effectively improve the strength of steel. The finer the grain, the greater the resistance of the expansion of plastic deformation under the action of the external force by the grain boundary, which is conducive to improving the strength of the steel. As the grain boundary increases, the energy consumed by the crack crossing the grain boundary increases, which slows down the crack propagation speed. At the same time, the size of the austenite grain directly affects the morphology, substructure and toughness of the martensite. The austenite grains are refined, and its toughness is correspondingly improved. [0003] Over the years, heat treatment workers and researchers at home and abroad have done a lot of wo...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N13/10
Inventor 梁华雷建中叶健熠梅亚莉梁林霞仇亚军高元安
Owner LUOYANG BEARING SCI & TECH CO LTD
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