Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for detecting distribution and content of residual austenite in low alloy structure steel

A technology for retained austenite and structural steel, applied in the field of detection of residual austenite distribution and content in low-alloy structural steel, can solve the problems of long test period, complicated process, complicated sample preparation process, etc., and achieve short polishing and corrosion time , simple operation, beautiful image effect

Active Publication Date: 2019-01-04
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF15 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used analysis methods in the laboratory include X-ray diffraction technology and EBSD analysis technology. When using X-ray diffraction technology to analyze the residual austenite content, it is necessary to make a standard sample. The process is complicated, and it cannot reflect the residual austenite in low-alloy structural steel. Distribution characteristics
Although the distribution of retained austenite in low-alloy structural steel can be displayed using EBSD technology, the sample preparation process is complicated, the cost is high, the test period is long, and the display effect is greatly affected by the internal stress of the sample.
[0004] Some existing metallographic display technologies are mainly for corrosion of M / A island, which has many interference phases, and mainly for pipeline steel

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
  • Method for detecting distribution and content of residual austenite in low alloy structure steel
  • Method for detecting distribution and content of residual austenite in low alloy structure steel
  • Method for detecting distribution and content of residual austenite in low alloy structure steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] The present invention provides a method for detecting the distribution and content of retained austenite in low-alloy structural steels, and is able to quickly and clearly display the low-alloy structure in view of the complicated operation of the existing method and the inability to accurately reflect the content and distribution of retained austenite The retained austenite structure in structural steel can be quantitatively analyzed accurately.

[0034] The present invention is a method for detecting the distribution and content of retained austenite in low alloy structural steel, including the following steps:

[0035] S1, sample preparation

[0036] Use metallographic water sandpaper for rough grinding and fine grinding on the test surface of the sample. After replacing the fine sandpaper, the grinding direction should be 90° with the direction of the upper track until the upper track wear marks are worn away; the above process needs to keep a constant flow of water As a ...

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

The invention discloses a method for detecting distribution and the content of residual austenite in low alloy structure steel. Water is used as cooling liquid, metallographic waterproof abrasive paper is used for rough grinding and fine grinding of a test surface of a sample, the sample subjected to fine grinding is polished, sodium metabisulfite, picric acid, sodium hydroxide, distilled water, hydrochloric acid and absolute ethyl alcohol are mixed, stirred and heated to prepare a corrosion reagent, the polished sample is subjected to electrolytic polishing treatment, the sample subjected toelectrolytic polishing treatment is placed into prepared corrosion solvents to remove interference phases, and distribution and the content of the residual austenite of the sample are detected by metallographic observation and representation. The method is simple in operation and short in polishing corrosion time. After the low alloy structure steel is corroded, a residual austenite structure in the low alloy structure steel can be clearly displayed. Characteristic parameters such as the content, the size, the shape and distribution of the residual austenite can be rapidly, accurately and quantitatively analyzed by metallographic software.

Description

Technical field [0001] The invention belongs to the technical field of metallographic structure display and quantification, and specifically relates to a method for detecting the distribution and content of retained austenite in low alloy structural steel. Background technique [0002] The strength and toughness of steel is closely related to its microstructure. Characteristic parameters such as the content, size, shape and distribution of retained austenite have an important effect on the strength and toughness of low-alloy structural steels. Therefore, the quantitative analysis of the distribution and content of retained austenite is of great significance to the structural design of low-alloy structural steels and the improvement of material properties, and has become an indispensable testing item in low-alloy structural steels. [0003] At present, the analysis methods commonly used in laboratories include X-ray diffraction technology and EBSD analysis technology. When using X-...

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 Applications(China)
IPC IPC(8): G01N1/32G01N21/84
CPCG01N1/32G01N21/84
Inventor 李鹤谢萍杨坤邹斌刘剑伍奕杨明尚臣
Owner BC P INC CHINA NAT PETROLEUM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products