Method for detecting micro defect inside metal material

A technology of metal materials and detection methods, which is applied in the direction of analyzing materials, using stable tension/pressure to test the strength of materials, measuring devices, etc., can solve the problems of time-consuming and cost, and improve the efficiency, accuracy and reliability of flaw detection , high detection range and high precision
CN106644718AInactive Publication Date: 2017-05-10武汉钢铁有限公司
5 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武汉钢铁有限公司
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for detecting a micro defect inside a metal material. The method comprises the following steps: (1) designing a variable-section ultrasonic fatigue test sample having a circular cross section and containing a constant-section segment according to an elastic modulus and a density value of a metal material to be detected, wherein the size of the test sample is designed according to a following formula: (as shown in the specification); (2) installing the test sample on an ultrasonic fatigue test machine to perform a fatigue test until the test sample is broken; and (3) observing a fracture of the broken test sample, measuring a defect size on the fracture of the test sample, that is a maximum defect size of the metal material. The method can rapidly, intuitively and quantitatively determine the defect in the metal material and can determine the micro defects which are 0.1 mm or smaller and even 10 micrometers or smaller inside the metal material.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a metal material quality inspection technology, in particular to a method for detecting tiny defects inside a metal material. Background technique

[0002] If the size of the internal defects introduced by the metal material in the smelting process is too large, its fatigue performance will be greatly reduced, which will also seriously shorten its service life, and even cause serious safety accidents due to premature failure of the material. Therefore, for metal materials, such as 3D printed metal materials or welded structures, flaw detection after leaving the factory is of great significance to ensure the safe application of materials. Traditional metal material flaw detection methods include X-ray flaw detection method and ultrasonic flaw detection method, and these methods have their own shortcomings. Among them, the x-ray flaw detection method is sensitive to volume defects, but it is difficult to find linear defects, esp...

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