A method for measuring the depth of decarburization layer of steel

A measurement method and technology of decarburization layer, which are applied to measurement devices, instruments, and the use of wave/particle radiation, etc. Simple operation and good statistical effect

Active Publication Date: 2019-01-18
SHOUGANG CORPORATION
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for measuring the depth of steel decarburization layer, which solves the problems of limited application range, complicated operation, poor statistical value of measured values, low accuracy and precision of the existing method for measuring the depth of decarburization layer of 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
  • A method for measuring the depth of decarburization layer of steel
  • A method for measuring the depth of decarburization layer of steel
  • A method for measuring the depth of decarburization layer of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 75Cr1 high-carbon steel plate sample is used, and the sample structure is pearlite + a small amount of ferrite. The specific steps and parameters are as follows:

[0023] 1. Sample preparation: first cut out a 75Cr1 block sample, the sample size is: 25mm (board width direction) × 20mm (plate length direction) × 8mm (plate thickness direction), then clean the sample and make a 25× The 8mm cross-section is ground and polished, and then placed in the electronic probe sample chamber for observation and testing.

[0024] 2. Surface analysis: Open the "Mapping" module of the electronic probe analysis software, select C element as the analysis element, set the acceleration voltage to 15KV, the beam current to 50nA, the beam spot size to 1μm, the acquisition time to 5ms / point, and select the surface analysis area to be 600× 450μm, click "Operate" to conduct surface scanning analysis of C element, and obtain the surface distribution map of C element.

[0025] 3. Line analysis p...

Embodiment 2

[0033] Select a 20CrMnTi low carbon steel bar sample, the sample structure is martensite + a small amount of ferrite, the specific steps and parameters are as follows:

[0034] 1. Sample preparation: first cut 20CrMnTi sample, sample size: diameter The height is 20mm, and then the sample is cleaned and the cross-section is ground and polished, and then placed in the electronic probe sample chamber for observation and testing.

[0035] 2. Surface analysis: Open the "Mapping" module of the electronic probe analysis software, select C element as the analysis element, set the acceleration voltage to 15KV, the beam current to 50nA, the beam spot size to 1μm, the acquisition time to 15ms / point, and select the surface analysis area to be 2.5× 1.8mm, click "Operate" to conduct surface scanning analysis of C elements, and obtain the surface distribution map of C elements.

[0036]3. Line analysis processing: Carry out line analysis processing on the surface distribution map of C elem...

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
lengthaaaaaaaaaa
widthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a determining method of steel decarburization depth and belongs to the technical field of metal material detection. The determination method comprises the steps that a sample is cut, cleaned, ground and polished and then put in an electronic probe sample room for analytical testing; the C element is selected for surface analysis, and the analysis depth is 2-5 times of the decarburization depth; a surface distribution diagram of the C element is subjected to line analytical processing; according to a changing curve of the C content, a central axis step method is adopted for determining, measuring and obtaining the decarburization depth value of the steel sample. The determination method has the advantages that the measured value of the decarburization depth is high in accuracy; the method is wide in applicable range and suitable for medium-carbon steel, high-carbon steel and low-carbon steel.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, in particular to a method for measuring the depth of a steel decarburization layer. Background technique [0002] At present, the methods for measuring the depth of decarburization layer of steel include metallographic method, hardness method and method of measuring carbon content. The metallographic method is more commonly used, which is to observe the structural changes of the sample from the surface to the matrix with the change of carbon content under an optical microscope, generally ferrite + pearlite structure. This method requires human eyes to judge the end point of the decarburization layer. For some samples whose structure is martensite or tempered structure, the transition layer and the matrix structure are difficult to distinguish, resulting in measurement failure or large measurement errors. [0003] Hardness methods include Rockwell hardness method and microhardnes...

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): G01B15/00
CPCG01B15/00
Inventor 严春莲鞠新华贾惠平其其格温娟孟杨
Owner SHOUGANG CORPORATION
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap