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Detection method for non-metal foreign substances in high speed steel powder

A technology for non-metallic inclusions and detection methods, applied in the field of powder high-speed steel, can solve the problems of controlling the content of large inclusions and high-speed steel powder without detection methods, achieving low cost, improving research and application level, and improving toughness Effect

Inactive Publication Date: 2012-06-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these methods are only for bulk powder high-speed steel samples, and there is no corresponding detection method for high-speed steel powder, and it is impossible to control the content of inclusions, especially large inclusions, from the source

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Take 10 g of high-speed steel T15 alloy powder, chemical composition (wt.%): C1.6, Cr4.0, V4.9, W12, Co5.0, Fe-based. Add the powder into a beaker filled with 400mL of 50% phosphoric acid aqueous solution;

[0017] (2) Put the beaker into an ultrasonic cleaner and perform ultrasonic stirring for 10 minutes every half hour;

[0018] (3) After the reaction was carried out for 2 hours, the mixed solution was passed through a test sieve with a mesh size of 10 μm;

[0019] (4) Dry the inclusions on the sieve surface after cleaning with pure water and alcohol;

[0020] (5) Weighing inclusions on a precision balance can quantitatively analyze their content levels;

[0021] (6) Qualitative analysis of inclusions under scanning electron microscope.

Embodiment 2

[0023] (1) Take 50 g of high-speed steel 2060 alloy powder, chemical composition (wt.%): C2.3, Cr4.0, V6.5, W6.5, Mo7.0, Co10.5, Fe-based. Add the powder into a beaker containing 2L of 40% phosphoric acid aqueous solution;

[0024] (2) Put the beaker into an ultrasonic cleaner and perform ultrasonic stirring for 10 minutes every half hour;

[0025] (3) After the reaction was carried out for 4 hours, the mixed solution was passed through a test sieve with a mesh size of 10 μm;

[0026] (4) Dry the inclusions on the sieve surface after cleaning with pure water and alcohol;

[0027] (5) Weighing inclusions on a precision balance can quantitatively analyze their content levels;

[0028] (6) Qualitative analysis of inclusions under scanning electron microscope.

Embodiment 3

[0030] (1) Take 100g high-speed steel 10V alloy powder, chemical composition (wt.%): C2.4, Cr5.0, V10.0, Mo1.2, Fe-based. Add the powder into a beaker filled with 4L 70% phosphoric acid aqueous solution;

[0031] (2) Put the beaker into an ultrasonic cleaner and perform ultrasonic stirring for 10 minutes every half hour;

[0032] (3) After the reaction was carried out for 8 hours, the mixed solution was passed through a test sieve with a mesh size of 10 μm;

[0033] (4) Dry the inclusions on the sieve surface after cleaning with pure water and alcohol;

[0034] (5) Weighing inclusions on a precision balance can quantitatively analyze their content levels;

[0035] (6) Qualitative analysis of inclusions under scanning electron microscope.

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Abstract

The invention belongs to the field of powder high speed steel, and relates to a detection method for non-metal foreign substances in high speed steel powder. According to the method, the high speed steel powder is taken; a phosphoric acid aqueous solution is added as a chemical corrosive agent, wherein a mass ratio of the high speed steel powder to the phosphoric acid aqueous solution is 1:40; a discontinuous stirring treatment is performed for 2-8 hours at a room temperature; the resulting mixing solution passes through a test sieve to carry out screening for the powder-containing phosphoric acid aqueous solution, and the resulting substances on the sieve (the non-metal foreign substances) are repeatedly washed and dried; quantitative analysis and qualitative analysis of the non-metal foreign substances are performed through a precision balance and a scanning electron microscopy. According to the present invention, the weak acid chemical corrosion method is adopted to dissolve the high speed steel powder matrix in the chemical solution to separate the foreign substances from the high speed steel powder, and finally the quantitative analysis and the qualitative analysis are performed on the non-metal foreign substances; the method has advantages of rapidness and high efficiency, low cost, accurate analysis, and the like, and the quantitative analysis and the qualitative analysis can be performed on the non-metal foreign substances with the method of the present invention.

Description

technical field [0001] The invention belongs to the field of powder high-speed steel, and relates to a method for detecting non-metallic inclusions in high-speed steel powder. Background technique [0002] It is well known that non-metallic inclusions in steel have a decisive influence on the properties of materials. Therefore, non-metallic inclusions are highly valued in material quality inspection, product control and material research. Inclusion inspection has become one of the important technical indicators for judging the quality of materials. Since the flexural strength of powder high-speed steel is inversely proportional to the square root of the limit defect diameter, eliminating large inclusions is one of the fundamental ways to improve the strength and quality of powder high-speed steel. For this reason, the second-generation and third-generation powder high-speed steels in foreign countries emphasize the reduction of the number of inclusions, especially large in...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N23/22
Inventor 许文勇张国庆李周袁华张勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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