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

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...