Method for detecting and analyzing internal defect evolution of metal casting in fatigue process

A technology for internal defects and metal castings, applied in the field of non-destructive testing of industrial CT technology and intelligent characterization of materials, can solve problems such as inability to evolve

Inactive Publication Date: 2015-04-15
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is a destructive test, and cannot intuitively analyze the evolution of early microscopic defects and the initiation of cracks.

Method used

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  • Method for detecting and analyzing internal defect evolution of metal casting in fatigue process
  • Method for detecting and analyzing internal defect evolution of metal casting in fatigue process
  • Method for detecting and analyzing internal defect evolution of metal casting in fatigue process

Examples

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specific Embodiment

[0092] In order to better understand the method of the present invention, examples will be given below for detailed description.

[0093] Taking the cast aluminum alloy material as an example, the sample is processed, and the metal sample before and after fatigue is scanned by 3D industrial CT, and the 3D industrial CT image is intelligently analyzed to obtain the evolution of the internal defects of the metal sample during the fatigue process .

[0094] The first step is metal sample design.

[0095] Sampling the material of the high-speed rail gear box and processing it into a solid cylinder as the metal sample 2. The middle part of the metal sample 2 is thinner, so that in the subsequent fatigue test process, cracks are more likely to occur in the middle of the metal sample 2, which is beneficial to crack detection. The location is predicted. Metal sample 2 size such as Figure 9 As shown, before the test, the middle part of the metal sample was polished to remove the in...

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Abstract

The invention discloses a method for detecting and analyzing internal defect evolution of a metal casting in a fatigue process based on a three-dimensional industrial CT technology, and belongs to the fields of industrial CT nondestructive detection and intelligent material characterization. The method comprises a detection method and an intelligent analysis method, wherein the detection method comprises the steps of performing industrial CT scanning on an original metal sample, performing fatigue loading test after scanning, designing a clamp for fixing the metal sample after the fatigue test and performing industrial CT scanning on the metal sample after the fatigue test; the intelligent analysis method comprises a method for classifying internal defects and a method for correspondingly identifying the defects before and after the fatigue test and analyzing fatigue evolution. According to the method, the three-dimensional industrial CT technology is combined with a conventional fatigue test, a detection result is analyzed by the intelligent analysis method, the evolution characteristics of different defects in a fatigue process are analyzed, a support is provided for component design and structure property analysis of the metal casting, and the application value is wide.

Description

technical field [0001] The invention relates to a detection method and an analysis method for the evolution process of internal defects in the metal casting fatigue process based on the three-dimensional industrial CT technology in the field of non-destructive testing of industrial CT technology and the field of intelligent characterization of materials. Background technique [0002] High-speed railways are developing rapidly in my country, and many lightweight metal materials are used in lightweight design, such as high-strength aluminum alloys, and high-speed railway gearboxes are cast from high-strength aluminum alloys. The service conditions of the high-speed railway gearbox are harsh and the service time is long, so the performance and quality of the castings are strictly required. Due to the complex factors affecting the quality of metal processing, it is difficult to comprehensively control, and the internal defects of processing are unavoidable, but some of these def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 张卫冬艾轶博孙畅王楠
Owner UNIV OF SCI & TECH BEIJING
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