Method for detecting pearlite content of ductile cast iron

A technology of ductile iron and detection method, applied in the direction of material resistance, etc., can solve the problems of damage to products, time-consuming and laborious, unable to meet the requirements of fast, accurate and economical detection, etc., and achieve the effect of fast detection speed and slow detection speed.

Inactive Publication Date: 2013-10-09
武汉华铁国昇检测技术有限公司
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Problems solved by technology

[0002] The traditional detection method of pearlite content in ductile iron is metallographic detection, which is time-consuming, laborious, and damages the product. It belongs to sampling detection, and the detection results are affected by randomness, which has been unable to meet the fast, accurate and economical detection requirements of modern production.

Method used

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  • Method for detecting pearlite content of ductile cast iron
  • Method for detecting pearlite content of ductile cast iron
  • Method for detecting pearlite content of ductile cast iron

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Experimental program
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Embodiment

[0027] 1. First, introduce the test principle of the eddy current testing method.

[0028] Eddy current testing is a non-destructive testing method based on the principle of electromagnetic induction, which is suitable for conductive materials. Due to electromagnetic induction, when the conductor is in a changing magnetic field or moves relative to the magnetic field, there is an induced current in the conductor. The characteristics of these currents are that they form a closed loop inside the conductor and flow in a vortex shape, so they are called eddy currents. . Due to the change of various factors of the conductor itself, the induced current changes. The detection method that uses this phenomenon to judge the nature and state of the conductor is the eddy current detection method.

[0029] The basic principle of eddy current testing is as follows: figure 1 As shown, when the test piece is placed near the coil with alternating current, the alternating magnetic field enter...

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Abstract

The invention relates to a method for detecting the pearlite content of ductile cast iron. N representative ductile cast iron samples (200-300*phi24) are prepared and are heat-treated by using different heat treatment processes to obtain the ductile cast iron with different matrix structures; the pearlite content of each sample is detected by using the traditional metallographic detection method, and then is detected by an eddy current detection method. The detection results show that the pearlite content of the ductile cast iron and eddy current values have a linear relationship, and the error values of the two detection methods are within 3%, and can meet the accuracy requirements of industrial application.

Description

technical field [0001] The invention relates to a method for detecting pearlite content, in particular to a method for detecting pearlite content in ductile iron. Background technique [0002] The traditional detection method of pearlite content in ductile iron is metallographic detection. This method is time-consuming, labor-intensive, and damages the product. It belongs to sampling detection. The detection results are affected by randomness and cannot meet the rapid, accurate and economical detection requirements of modern production. Ductile iron is mainly composed of pearlite, ferrite and spherical graphite, among which ferrite is a solid solution with extremely low carbon content, and its electromagnetic properties are close to pure iron, while pearlite is ferrite and cementite mechanical mixture. Contents of the invention [0003] Above-mentioned technical problem of the present invention is mainly solved by following technical scheme: [0004] A method for detecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 田代才张鹤武
Owner 武汉华铁国昇检测技术有限公司
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