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

Method for eliminating residual stress in steel

A residual stress and pulse current technology, applied in the direction of improving process efficiency, can solve problems such as affecting the structure of materials, and achieve the effects of simple and convenient operation, elimination of residual stress and high efficiency

Inactive Publication Date: 2009-01-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have been widely used in modern industry, they each have obvious shortcomings, such as annealing will affect the structure of the material, etc.

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 eliminating residual stress in steel
  • Method for eliminating residual stress in steel
  • Method for eliminating residual stress in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The steel used is 40Cr steel, and the chemical composition (mass fraction, %) of the steel is: C 0.38, Mn 0.69, Si 0.33, Cr 0.93. figure 1 It is a schematic diagram of the device (discharge circuit) of the pulse current processing process (this device is a known technology). It consists of a pulse current generator and an oscilloscope. The pulse current generator includes a current detection coil 4, a capacitor bank 5, a discharge switch 6, a control circuit, a trigger circuit, a charging circuit, etc. The control circuit is used to control the charging circuit and the trigger circuit respectively. Opening and closing; when working, the control circuit sends an instruction to the charging circuit. After the capacitor bank 5 is charged, the control circuit sends an instruction to the trigger circuit to close the discharge switch. The capacitor bank 5 discharges to generate a pulse current, and the sample 1 is processed. The current detection coil 4 is externally connecte...

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 technology for eliminating residual stress in steel, in particular to a pulse current processing method for eliminating the residual stress in the steel, which can effectively eliminate the residual stress in the steel and basically not influence organization structure in the steel simultaneously. The method carries out pulse current processing to the steel (such as quenching) with the residual stress, and the technological parameters of the pulse current comprise that discharge period is 10Mus to 1000Mus, maximum peak value current density is 10<3> to 10<5>A / cm<2>, and the duration of a single pulse is 10 to 10000Mus. The method is characterized in that: simultaneously maintaining the needed micro-structure, part of the material after pulse processing still fully eliminates the residual stress in the material; furthermore, the time of the pulse current processing is short, the efficiency is high, and the operation is convenient.

Description

Technical field: [0001] The invention relates to a technique for eliminating residual stress in steel, in particular to a pulse current treatment method for eliminating residual stress in steel. Background technique: [0002] Residual stress has a very important impact on the mechanical properties of materials, which will reduce the fatigue strength, stress corrosion resistance, dimensional stability and service life of materials. The most important existing methods for eliminating residual stress are: annealing, adding static load and mechanical vibration. Although these methods have been widely used in modern industry, each of them has obvious shortcomings, such as annealing will affect the structure of the material. Finding new and more effective ways to eliminate residual stress has always been the focus of industry and researchers. Invention content: [0003] The purpose of the present invention is to provide a method for eliminating residual stress in steel by puls...

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): C21D10/00
CPCY02P10/20
Inventor 郭敬东王景鹏王宝全
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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