Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of extraction method of non-metallic inclusions in superalloy

A technology of non-metallic inclusions and superalloys, applied in the field of metal materials, can solve the problems of obstructing the observation and analysis of non-metallic inclusions, and the shedding of nickel-based superalloy substrates, so as to ensure experimental safety, less doping items, and purity. high effect

Active Publication Date: 2021-05-07
UNIV OF SCI & TECH BEIJING
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a method will lead to serious matrix shedding problems in nickel-based superalloys during electrolysis
Since superalloys contain high levels of strong carbide-forming elements such as Ti, Nb, Mo, W, Ta, etc., the extract after electrolysis is often a mixture of carbides and non-metallic inclusions, and carbides account for the vast majority. The surface of non-metallic inclusions is covered by objects, which seriously hinders the observation and analysis of non-metallic inclusions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of extraction method of non-metallic inclusions in superalloy
  • A kind of extraction method of non-metallic inclusions in superalloy
  • A kind of extraction method of non-metallic inclusions in superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] In this embodiment, the nickel-based superalloy GH4169 is taken as an example, and the GH4169 alloy is produced by a vacuum induction melting (VIM) process. The non-metallic inclusions in the GH4169 alloy are separated and extracted by using the method for separating non-metallic inclusions in the nickel-based superalloy provided by the embodiment of the present invention. The specific steps are as follows:

[0068] (1) Sample preparation:

[0069] Process the alloy ingot into a sample of 10×100mm (diameter×height) by machining, put the sample in acetone solution and clean it with ultrasonic vibration for 10 minutes;

[0070] (2) Determination of electrochemical curve

[0071] The polarization curve of GH4169 was measured by the steady-state constant potential method, and the weight ratio of citric acid in the electrolyte was determined to be 5%, and the current density was 30mA / cm 2 .

[0072] (3) Dialysis membrane pretreatment:

[0073] Select a dialysis membrane ...

Embodiment 2

[0087] This embodiment takes the nickel-based superalloy GH4738 as an example, and the GH4738 alloy is produced by vacuum induction melting (VIM) and electroslag remelting (ESR) processes. The non-metallic inclusions in the GH4738 alloy are separated and extracted by using the method for separating non-metallic inclusions in the nickel-based superalloy provided by the embodiment of the present invention. The specific steps are as follows:

[0088] (1) Sample preparation:

[0089] Process the alloy ingot into a sample of 10×100mm (diameter×height) by machining, put the sample in acetone solution and clean it with ultrasonic vibration for 10 minutes;

[0090] (2) Determination of electrochemical curve

[0091] The polarization curve of GH4738 was measured by the steady-state constant potential method, and the weight ratio of citric acid in the electrolyte was determined to be 15%, and the current density was 60mA / cm 2 .

[0092] (3) Dialysis membrane pretreatment:

[0093]Se...

Embodiment 3

[0107] In this embodiment, the cobalt-based superalloy GH159 is taken as an example, and the GH159 alloy is produced by a vacuum induction melting (VIM) process. The non-metallic inclusions in the GH159 alloy are separated and extracted by using the method for separating non-metallic inclusions in the cobalt-based superalloy provided by the embodiment of the present invention. The specific steps are as follows:

[0108] (1) Sample preparation:

[0109] Process the alloy ingot into a sample of 10×100mm (diameter×height) by machining, put the sample in acetone solution and clean it with ultrasonic vibration for 10 minutes;

[0110] (2) Determination of electrochemical curve

[0111] The polarization curve of GH159 was measured by the steady-state constant potential method, and the weight ratio of citric acid in the electrolyte was determined to be 10%, and the current density was 30mA / cm 2 .

[0112] (3) Dialysis membrane pretreatment:

[0113] Select a dialysis membrane wit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
pore sizeaaaaaaaaaa
current densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for extracting non-metallic inclusions in high-temperature alloys, which relates to the technical field of metal materials. The extracted inclusions have high purity and few doping items, and can achieve better qualitative extraction of non-metallic inclusions in high-temperature alloys. effect; the method steps include: according to the polarization curve of the superalloy, determine the proportioning of the electrolyte and the electrolysis system; adopt the electrolyte and the electrolysis system to carry out non-aqueous weak acid solution electrolysis on the superalloy sample; The periphery of the sample is provided with a dialysis membrane for collecting non-metallic inclusions; the solution containing non-metallic inclusions is refluxed and boiled with hydrochloric acid-ethanol solution to remove interference items; non-metallic inclusions are collected by vacuum filtration, Then ethanol solution is used to remove impurity ions that can be dissolved in ethanol to obtain non-metallic inclusions. The technical scheme provided by the invention is suitable for the process of extracting non-metallic inclusions of high-temperature alloys.

Description

【Technical field】 [0001] The invention relates to the technical field of metal materials, in particular to a method for extracting non-metallic inclusions in superalloys. 【Background technique】 [0002] Superalloys have good mechanical properties and comprehensive strength and toughness indicators, as well as good thermal fatigue resistance, thermal corrosion resistance and corrosion resistance. Therefore, it is widely used in key components of heavy industries such as aerospace, industrial gas turbines, petrochemicals, ships and ships, and nuclear power equipment. Superalloys contain more active elements Al and Ti, which are very easy to react with O and N in the alloy melt and smelting atmosphere to form Al 2 o 3 、TiO 2 , TiN and other oxide and nitride inclusions. [0003] With the continuous advancement of research work, many research results have shown that the non-metallic inclusion defects in superalloys can significantly reduce the mechanical properties and proce...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/40G01N1/32G01N1/34
CPCG01N1/32G01N1/34G01N1/40G01N2001/4038
Inventor 曲选辉栾益锋高小勇章林陈晓玮徐浩然
Owner UNIV OF SCI & TECH BEIJING