Unlock instant, AI-driven research and patent intelligence for your innovation.

Tempering method for reducing residual stress

A technology of residual stress and tempering temperature, which is applied in the field of heat treatment, can solve problems such as cracking of parts or materials, reducing the fatigue life of materials or parts, and the ability to resist stress corrosion

Active Publication Date: 2019-12-03
WUHAN UNIV OF SCI & TECH
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, due to the increase of residual stress on the surface of the material, it is easy to cause the stress state of the material surface to be a tensile stress state after tempering treatment, which reduces the fatigue life of the material or part and the ability to resist stress corrosion. to crack

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
  • Tempering method for reducing residual stress
  • Tempering method for reducing residual stress
  • Tempering method for reducing residual stress

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] A method of tempering to reduce residual stress, such as figure 1 As shown, heating, heat preservation and cooling are carried out in sequence. The heating includes two stages. The first stage is a high-speed heating stage. The material or part to be tempered is rapidly heated from room temperature to temperature T1, and the temperature T1 ranges from 300°C to 500°C. The larger the size of the material or part, the higher the temperature T1. The second stage is the low-speed heating stage, and the material or part to be tempered is slowly heated from the temperature T1 to the set tempering temperature for heat preservation.

[0019] One of the main reasons for the limitation of residual stress adjustment ability during tempering and the formation of tensile stress state on the surface after tempering is the temperature stress generated during the...

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 tempering method for reducing the residual stress. The method comprises sequentially heating, preserving the heat and cooling, wherein the heating comprises two stages, the first stage is a high-speed heating stage, a to-be-tempered material or part is rapidly heated to the temperature T1 from the room temperature, the larger the size of the material or part is, the higher the temperature T1 is, and the second stage is a low-speed heating stage, and the to-be-tempered material or part is slowly heated to a set tempering temperature from the temperature T1 for heat preservation. According to the method, the regulation and control effect of the tempering on the residual stress is enhanced, the formation of the new residual stress during the tempering process is inhibited, and meanwhile the strength and toughness of the materials are improved.

Description

technical field [0001] The invention belongs to the field of heat treatment, and in particular relates to a tempering method for reducing residual stress. Background technique [0002] Quenching is the basic process method to improve the strength of materials in the process of metal material preparation. However, while quenching increases the strength, it introduces a high level of residual stress inside the material, which not only greatly reduces the fatigue life and stress corrosion resistance of the material, but also easily causes the shape and size of the material or part to appear during processing and use. change. [0003] Tempering is a process of heating the quenched metal material to a certain temperature below the critical temperature Ac1 (the temperature at which austenite begins to form when the steel is heated), so as to reduce the stress level in the material and control the quenching residual stress. The regulation mechanism of residual stress during tempe...

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): C21D1/18C21D11/00
CPCC21D1/18C21D11/00Y02P10/20
Inventor 丁文红王新东齐建军孙力刘天武吴挺潘进臧之祺
Owner WUHAN UNIV OF SCI & TECH