Method for repairing micro-defects inside metal materials

A technology of metal materials and microscopic defects, which is applied in the field of material engineering to achieve the effects of increasing strength and wear resistance, ensuring the accuracy of external dimensions, and improving fatigue life

Active Publication Date: 2016-11-30
WUHAN JINGTAI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a repair method for internal microscopic defects of metal materials that ca

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take the YG6 grade cemented carbide produced in the factory, and sinter it to prepare a cemented carbide rod with a diameter of 10mm. The cemented carbide rod is a ferromagnetic material and the microscopic defect configuration inside the matrix mainly consists of stacking faults, subgrain boundaries, The isoplane defects at the phase interface constitute the microcrack initiation nucleus. The cemented carbide rod is placed in an external physical field excitation device capable of generating pulsed magnetic fields and pulsed electric fields. Specifically, the two ends of the cemented carbide rod are connected to the electrodes of the pulse power supply and placed in a multi-turn excitation coil In the magnetic field formed with the iron core; choose the external field treatment process of item b to repair internal microscopic defects, turn on the excitation power supply and pulse power supply, and apply magnetic pulse and electric pulse at the same time; the magnetic fi...

Embodiment 2

[0044] Take the YG8 grade cemented carbide produced in the factory, and sinter it to prepare a cemented carbide rod with a diameter of 10mm. The cemented carbide rod is a ferromagnetic material and the microscopic defect configuration inside the matrix mainly consists of stacking faults, subgrain boundaries, The isoplane defects at the phase interface constitute the microcrack initiation nucleus. The cemented carbide rod is placed in an external physical field excitation device capable of generating pulsed magnetic fields and pulsed electric fields. Specifically, the two ends of the cemented carbide rod are connected to the electrodes of the pulse power supply and placed in a multi-turn excitation coil In the magnetic field formed with the iron core; choose the external field treatment process of item b to repair internal microscopic defects, turn on the excitation power supply and pulse power supply, and apply magnetic pulse and electric pulse at the same time; the magnetic fi...

Embodiment 3

[0046] Take the YG15 grade cemented carbide produced in the factory, and sinter it to prepare a cemented carbide rod with a diameter of 10mm. The cemented carbide rod is a ferromagnetic material and the microscopic defect configuration inside the matrix mainly consists of stacking faults, subgrain boundaries, The isoplane defects at the phase interface constitute the microcrack initiation nucleus. The cemented carbide rod is placed in an external physical field excitation device capable of generating pulsed magnetic fields and pulsed electric fields. Specifically, the two ends of the cemented carbide rod are connected to the electrodes of the pulse power supply and placed in a multi-turn excitation coil In the magnetic field formed with the iron core; choose the external field treatment process of item b to repair internal microscopic defects, turn on the excitation power supply and pulse power supply, and apply magnetic pulse and electric pulse at the same time; the magnetic f...

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PUM

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Abstract

The invention discloses a method for repairing micro-defects inside metal materials which can repair the micro-defects inside the metal materials so as to improve the performance of the metal materials without affecting the thermal deformation of the metal materials. The method comprises the following steps: putting the metal material to be repaired in an external physical field excitation device capable of generating a pulsed magnetic field and a pulsed electric field, and selecting the appropriate field treatment process for processing according to the magnetic property of the metal material and the configuration type of the microscopic defect inside the substrate. In this way, the in-situ repair of internal defects of metal materials can be realized by pulsed magnetic field and pulsed electric field induction. Therefore, the plastic toughness of metal materials is improved, the strength of materials can be increased, the abrasion resistance of materials can be greatly improved, the initiation of microcracks can be restrained and expansion of the microcracks can be delayed, and the fatigue life of the materials can be significantly prolonged. In addition, the whole repair process will not cause significant temperature rise and thermal deformation of the metal material.

Description

technical field [0001] The invention belongs to the field of material engineering, and in particular relates to a method for repairing internal microscopic defects of metal materials. Background technique [0002] The internal atomic structure of metal materials is periodically arranged in the form of crystals, and there are inevitably a large number of internal defects, such as atomic vacancies, lattice dislocations, twins, and microcracks. The existence of defects destroys the periodicity of the internal atomic structure and energy potential field of the metal material, causing local micro-area distortion. The distorted area of ​​atomic arrangement tends to have higher energy than the regular area, which affects the preparation, processing, and Performance during service, etc. Among them, the internal lattice dislocation defects of metal materials are the essential reasons that affect the mechanical properties such as strength, plasticity and toughness of metal materials....

Claims

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Application Information

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IPC IPC(8): C22F3/00C21D10/00
CPCC21D10/00C22F3/00
Inventor 王明道杨屹刁爱民王丽平杨刚
Owner WUHAN JINGTAI TECH CO LTD
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