Separation method of non-metallic inclusions in inconel625 series superalloys

Abstract

The invention discloses a separation method for nonmetallic inclusions in an Inconel625-series high-temperature alloy, and belongs to the technical field of methods for researches on nonmetallic inclusions in metallic materials. A proper electrolyte is selected to electrolyze a high-temperature alloy test sample; a collected extract mixture is separated by virtue of a chemical method after electrolysis, and carbides are dissolved to completely and nondestructively extract fine oxide inclusions in the Inconel625-series high-temperature alloy; the obtained oxide inclusions are observed to have obvious particle shapes under a scanning electron microscope, and are proven to be Al and Mg containing composite oxide inclusions by energy spectrum analysis.

Description

technical field [0001] The invention relates to a research method for non-metallic inclusions in metal materials, in particular to the quantitative extraction of non-metallic inclusions in Inconel625 series superalloys. Background technique [0002] Inconel 625 series superalloy refers to 625 alloy and its derivative materials (718, 706, etc.). It occupies an extremely important position in the field of high-temperature alloys and is widely used in key components in heavy industries such as aerospace, industrial gas turbines, petrochemicals, ships and ships, and nuclear power equipment. Therefore, such materials are required to have extremely high physical and chemical properties, and trace non-metallic inclusions seriously affect their performance indicators. [0003] At present, the research on non-metallic inclusions is mainly concentrated in iron and steel materials, and the research on non-metallic inclusions in steel is quite mature, while the research on non-metallic...

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Problems solved by technology

This method has a serious problem of matrix shedding in the electrolysis of nickel-based superalloys; usually the extract after electrolysis is often a mixture of carbides and non-metallic inclusions, carbides account for the vast majority, and the mixed extraction from carbides and non-metallic inclusions The separation of non-metallic inclusions from solids has not been paid enough attention; and the purity of nickel-based superalloys is much higher than that of ordinary steel, resulting in small non-metallic inclusions in content and size. Non-metallic inclusions often serve as the nucleation center of carbides, and some carbides nucleate and grow on the non-metallic inclusions, forming a coating structure, which seriously affects the observation and analysis of non-metallic inclusions after electrolytic collection

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