Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-stage corrosion process for observing original-state and solid-solution-state metallographic structures of high-temperature alloy

A technology of superalloy and metallographic structure, applied in the field of superalloy sample preparation, can solve the problems of reduced work efficiency, unsatisfactory corrosion effect of solid solution structure, poor corrosion effect of solid solution strengthened alloy, etc. uniform, easy to corrode the sample, and the effect of reducing the corrosion rate

Pending Publication Date: 2022-03-01
HUANENG POWER INTERNATIONAL +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current alloy corrosives often have poor corrosion effects on solid-solution-strengthened alloys, and the corrosion effect on solid-solution structures of precipitation-strengthened alloys is not ideal. Technical requirements, but also reduce work efficiency

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
  • Multi-stage corrosion process for observing original-state and solid-solution-state metallographic structures of high-temperature alloy
  • Multi-stage corrosion process for observing original-state and solid-solution-state metallographic structures of high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The superalloy used in this embodiment includes: C: 0.03%, Cr: 15%, Mo: 0.9%, W: 0.5%, Nb: 1.5%, Al: 1.3%, Ti: 2.5%, Ni: 40%, Co: 20%, Mn: 0.2%, P: 0.01%, S: 0.01%, B: 0.001%, and the balance is Fe.

[0040] Grinding and cleaning are carried out before the alloy is corroded, and the sample to be observed is polished to the metallographic grade by multiple passes before corroding, and the last two polishing processes do not exceed 1 min and 30 s respectively. After polishing, use an optical microscope to observe the surface of the sample at 100 times to confirm that there are no obvious scratches, pits and other defects on the surface. After completion, soak the surface of the sample in acetone or alcohol solution for ultrasonic cleaning for 10 minutes, and finally dry the surface;

[0041] Sample corrosion is carried out in two steps, including:

[0042] Pre-corrosion: using 0.5% CuSO 4 +30% hydrochloric acid +35% CH 3 OH + 34.5% distilled water mixed solution was ti...

Embodiment 2

[0049] The high-temperature alloy used in this embodiment includes: C: 0.08%, Cr: 16%, Mo: 0.5%, W: 8.5%, Nb: 1%, Al: 2%, Ti: 1%, Ni: 30%, Co: 2%, Si: 0.3%, Mn: 0.1%, P: 0.02%, S: 0.01%, Zr: 0.01%, B: 0.005%, and the balance is Fe.

[0050] 1) Pretreatment: Polish the high-temperature alloy to the metallographic grade through multiple passes. When polishing for multiple passes, the last two polishing times should not exceed 1min and 30s respectively, then soak in acetone or alcohol solution for ultrasonic cleaning for 5min, and dry .

[0051] The surface roughness Ra of the superalloy after pretreatment is not higher than 0.15.

[0052] 2) Corrode the pretreated superalloy with a pre-etching solution for 5 minutes, rinse and dry; wherein, the pre-etching solution is obtained by the following process: by mass percentage, 1.0% CuSO 4 , 25% hydrochloric acid and 35% methanol were added to 39% distilled water and mixed uniformly.

[0053] A corrosion passivation layer not highe...

Embodiment 3

[0057] The superalloy used in this embodiment includes, by mass percentage, C: 0.05%, Cr: 17%, Mo: 0.1%, W: 3%, Nb: 0.5%, Al: 3%, Ti: 1.5%, Ni: 49%, Co: 10%, Si: 0.1%, Mn: 0.3%, B: 0.002%, and the balance is Fe.

[0058] 1) Pretreatment: Polish the high-temperature alloy to the metallographic grade through multiple passes. When polishing for multiple passes, the last two polishing times should not exceed 1min and 30s respectively, then soak in acetone or alcohol solution for ultrasonic cleaning for 10min, and dry .

[0059] The surface roughness Ra of the superalloy after pretreatment is not higher than 0.15.

[0060] 2) Corrode the pretreated superalloy with pre-corrosion solution for 2 minutes, rinse and dry; wherein, the pre-corrosion solution is obtained through the following process: by mass percentage, 1.0% CuSO 4 , 35% hydrochloric acid and 25% methanol were added to 39% distilled water, and mixed uniformly.

[0061] A corrosion passivation layer not higher than 150n...

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

No PUM Login to View More

Abstract

A multi-stage corrosion process for observing the original-state and solid-solution-state metallographic structures of a high-temperature alloy comprises the following steps that the pretreated high-temperature alloy is corroded for 0.5-5 min through a pre-corrosion solution, and washing and drying are conducted; and then soaking and corroding the high-temperature alloy in the corrosive liquid for 5-30 seconds, then washing with the washing liquid, and drying. Through the multi-stage corrosion technology, a compact protection layer is formed on the surface of the sample at the initial stage, the corrosion rate in the metallographic corrosion process is reduced, and the problems of uneven corrosion, corrosion pits and the like caused by flowing of a corrosive agent and the like are solved; the problems of uneven corrosion, corrosion pits and the like easily caused by slight carelessness due to the fact that the solid solution state sample is sensitive to the uniformity, flowability and the like of the corrosive in the corrosion process are solved.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy sample preparation, and in particular relates to a multi-stage corrosion process for observing the metallographic structure of the original state and solid solution state of the high-temperature alloy. Background technique [0002] Due to its excellent high-temperature performance, superalloys are expected to be popularized and applied in industries such as electric power and petrochemicals. Among them, polycrystalline superalloys have become one of the most potential candidate materials due to their low cost and relatively recommended forming and preparation processes. The service performance of polycrystalline superalloys is closely related to its own microstructure, and the grain size and grain boundary precipitation will have a significant impact on the performance of the material. Therefore, complete material design, preparation and molding, and failure analysis are required. Grasp the s...

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
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 严靖博谷月峰袁勇杨征张醒兴
Owner HUANENG POWER INTERNATIONAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com