Detection method of austenite stainless steel plastic deformation

A technology of austenitic stainless steel and plastic deformation, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of low detection efficiency, long detection time, large excitation current, etc., achieve high detection efficiency, no need The effect of surface treatment and simple operation

Inactive Publication Date: 2013-04-24
BEIFANG UNIV OF NATITIES
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this detection equipment requires a large excitation current for detection, and can only be detected point by point, so that each detection point is excited once, the detection takes a long time, consumes a large current, and the detection efficiency is low.
More importantly, it only realizes the determination of the ferrite phase content in austenitic stainless steel, and does not correlate the ferrite phase content with the degree of plastic deformation in the material

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
  • Detection method of austenite stainless steel plastic deformation
  • Detection method of austenite stainless steel plastic deformation
  • Detection method of austenite stainless steel plastic deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step: the plastic deformation of austenitic stainless steel - the establishment method of the calibration curve of the DC magnetization residual magnetic field strength, the specific steps include:

[0028] 1) Refer to figure 2 , making austenitic stainless steel 304 series test pieces, stretching them with a stretching machine, and introducing different degrees of plastic deformationε 1 , ε 2 , ε 3 …ε N , that is, 0.5%, 1%, 2%...30%, and the degree of plastic deformation ε of different specimens is measured by optical strain detection equipment 6 1 , ε 2 , ε 3 …ε N .

[0029] 2) Refer to image 3 , using a DC magnetization device 2 with a strength of 200mT to conduct DC magnetization perpendicular to the surface of the test object for all test pieces.

[0030] 3) Refer to Figure 4 , using the fluxgate magnetic field measuring device 4 to measure the residual magnetic field intensity B of all test pieces after DC magnetization and perpendicular to ...

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 relates to a detection method of austenite stainless steel plastic deformation. The detection method of the austenite stainless steel plastic deformation is characterized by comprising the following steps: (1) series of specimens are manufactured for different austenite stainless steel materials; (2) the series of specimens are damaged in different degrees of plastic deformation, and meanwhile the plastic deformation is detected; (3) the damaged specimens are direct current magnetized; (4) a magnetic field measurement device is adopted to determine intensity of residual magnetic field of different specimens; (5) the austenite stainless steel plastic deformation and standardization relation curve (5) of the residual magnetic field are got; (6) the austenite stainless steel detected object is direct current magnetized; (7) the standardization relation curve (5) is compared according to the detected intensity of residual magnetic field to get actual plastic deformation of the corresponding detected object. The nondestructive detection method can nondestructively and quantitatively detect the plastic deformation degree of low-magnetic austenite stainless steel materials before macroscopic defects are produced, and fill a vacancy of the detection method of the field.

Description

technical field [0001] The invention relates to a non-destructive testing method by means of artificial direct current magnetization, in particular to a testing method for plastic deformation of austenitic stainless steel. Background technique [0002] Austenitic stainless steel is widely used to manufacture components of nuclear power equipment because of its superior mechanical properties, corrosion resistance, and weak magnetic properties. In order to ensure the safe operation of nuclear power equipment, it is very important to detect the damage state before the macroscopic cracks occur. The plastic deformation caused by force is the key factor in inducing and advancing material damage, so the detection of the degree of plastic deformation becomes the key point of the damage state detection before the macro cracks of austenitic stainless steel. [0003] For weakly magnetic austenitic stainless steel under normal conditions, plastic deformation can lead to the generation ...

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): G01B7/16
Inventor 李红梅
Owner BEIFANG UNIV OF NATITIES
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