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Heating and vibrating stress removing method for metal material

A metal material and stress relief technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of limited residual stress reduction, material self-cracking, material deterioration, etc., to achieve simple implementation and reduce residual The effect of stress, working principle mature

Inactive Publication Date: 2006-03-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main advantages of the conventional vibration stress relief method are no environmental pollution, low energy consumption, simple process and suitable for on-site operation, etc., which can properly reduce or homogenize the residual stress in the material; the disadvantage is that due to the vibration of the material at room temperature, the residual stress The reduction range is very limited, in fact, the effect of fully reducing the residual stress in the material is often not achieved, and the cyclic stress in the elimination process may sometimes lead to material self-cracking or material degradation, etc.

Method used

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  • Heating and vibrating stress removing method for metal material
  • Heating and vibrating stress removing method for metal material
  • Heating and vibrating stress removing method for metal material

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Embodiment Construction

[0017] Provide following embodiment in conjunction with content of the present invention:

[0018] (1) Experimental materials

[0019] Ordinary low-carbon steel plate with a thickness of 10 mm was welded with a V-shaped groove. A total of 4 experimental materials were welded with the same process, numbered 1-4, and the 1st weld was not subjected to stress relief treatment.

[0020] (2) Heating annealing

[0021] Heat the No. 2 weld seam to 400°C for a short-time heat annealing treatment at medium temperature, and the heat annealing time is 20 minutes.

[0022] (3) Conventional vibration treatment

[0023] Using the conventional room temperature vibration stress relief method, the No. 3 weld was subjected to stress relief vibration treatment, and the vibration time was selected as 20 minutes.

[0024] (4) Joint treatment of heating and vibration

[0025] Heat the No. 4 weld seam to 400°C, and carry out combined heating and vibration stress relief treatment at the same time,...

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Abstract

A method for removing the residual stress from material by the combination of vibration and heating includes such steps as choosing the heating temp and manner, choosing the resonance frequency and amplitude of metallic material, choosing the heating-vibrating time, heating the metallic material or the pare of large member at a temp lower than 500 deg.C while cyclically applying the vibration load to make the load greater than the yield strength of metallic material.

Description

technical field [0001] The invention relates to a method in the technical field of metal heat treatment, in particular to a method for stress relief combined with heating and vibration of metal materials. Background technique [0002] It is inevitable that there will be residual stress in the material, which may lead to dimensional instability and cracking damage, etc., which has always been regarded as a defect. Therefore, the elimination of residual stress is a very important task in the machining industry. The traditional stress relief method is to heat and anneal the material, that is, to heat the material to a high temperature state below the phase transition temperature, resulting in the release of residual stress in the material. During the heating and annealing process of materials, the stress thermal relaxation process usually occurs, and the reduction of residual stress follows the law of thermodynamics, and the degree of reduction is mainly related to factors suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D11/00
Inventor 姜传海洪波叶雅萍
Owner SHANGHAI JIAO TONG UNIV