Metallographic sample outer mold structure

Abstract

The invention provides a metallographic sample outer mold structure comprising a column body. The structure is characterized in that the shape of the column body is a rat-tail round-table structure formed with the extension of a cylinder tapered outer circle contour. A metallurgical testing position is that: a metallurgical testing thick-wall position is at a central area at a column cross-section when the column is cut along a central cross-section. Therefore, the thick-wall position is positioned at a round-table structure central area of the rat-tail round-table structure, and a thin-wall position is at a rat-tail structure of the rat-tail round-table structure. According to the invention, the metallographic sample structure provided by the invention matches the solidification rate of the solid heat-resistant alloy nodular cast iron, such that defect detection rate of heat-resistant alloy nodular cast iron is improved, and manufacturing cost of heat-resistant alloy nodular cast iron is reduced.

Description

technical field [0001] The invention relates to a mould, in particular to an outer mold structure of a metallographic sample used for heat-resistant alloy nodular cast iron material control in the pouring control process. It belongs to the field of mechanical casting. Background technique [0002] In the production process of heat-resistant alloy ductile iron, the shell mold of the special metallographic testing sample that is sampled and cast with the molten metal is called the metallographic sample mold. The main function of the metallographic sample mold is to detect whether the spheroidization rate of molten metal is qualified. After the poured metallographic sample is formed and cooled, the sample is cut, ground, and polished at a fixed position, and finally the spheroidization rate of the designated position is determined with a microscope. [0003] In order to improve the detection rate of poor spheroidization of heat-resistant alloy ductile iron, it is often consid...

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Problems solved by technology

[0005] Existing metallographic samples, because the shape is relatively single, often do not match the graphite quantity and graphite form of the main inspection area of ​​the entity, so the detection rate of its poor spheroidization is low; on the other hand, due to the The material of the sample mold is coated sand material, which has no thermal insulation performance. Therefore, when the molten iron contacts the sand mold, it will solidify quickly. Moreover, the shape and quantity of graphite on the entire metallographic test surface cannot match the entity. Therefore, using The detection rate of poor nodularity of heat-resistant alloy ductile iron is low, and at the same time, the manufacturing cost of heat-resistant alloy ductile iron is increased

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