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Nondestructive detecting method of spring steel decarburized layer deepness

A non-destructive testing and decarburization layer technology, applied in the direction of measuring devices, testing metals, material inspection products, etc., can solve the problems of destructive testing, large errors, and inability to achieve 100% testing, and achieve the effect of simple testing methods

Inactive Publication Date: 2007-10-31
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical method is to measure the depth of the decarburization layer by measuring the carbon content of different layers on the surface. The operation is very complicated and the error is large, so it is not suitable for production inspection
[0005] In addition, the common problem of the above three methods is that the inspection is destructive, and 100% inspection cannot be realized, and on-site inspection cannot be realized

Method used

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  • Nondestructive detecting method of spring steel decarburized layer deepness

Examples

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Effect test

Embodiment 1

[0023] (1) For the same batch of spring steel with a material of 60Si2Mn and a diameter of φ20, 10 samples were prepared, each with a length of 100mm. Carry out quenching (the work piece is hardened during quenching)-tempering treatment, so that the depth of the decarburized layer of these 10 pieces is 0.1mm, and measure and record the diameter difference of each sample before and after quenching-tempering. Cut and inspect each sample, measure the depth of the decarburized layer under a metallographic microscope, select samples with the depth of the decarburized layer in the range of 0.1±0.01mm, and calculate the average of the difference between the diameters of these samples before and after quenching and tempering Value and record.

[0024] (2) Take 10 samples each three times in sequence to make the depth of the decarburized layer of these samples reach 0.2mm, 0.3mm, 0.4mm respectively. Repeat the above test to obtain the relationship between the depth of the decarburized laye...

Embodiment 2

[0027] (1) For the same batch of spring steel with a material of 60Si2Mn and a diameter of φ30, 10 samples were prepared, each with a length of 100mm. Carry out quenching (the workpiece is hardened during quenching)-tempering treatment to make the depth of the decarburized layer of these 10 pieces at 0.1mm, and measure the diameter difference of each sample before and after quenching-tempering and record it. Cut and inspect each sample, measure the depth of the decarburization layer under a metallographic microscope, select the samples with the depth of the decarburization layer within 0.1±0.01mm, and calculate the average of the difference between the diameters of these samples before and after quenching and tempering Value and record.

[0028] (2) Take 10 samples each three times in sequence to make the depth of the decarburized layer of these samples reach 0.2mm, 0.3mm, 0.4mm respectively. Repeat the above test to obtain the relationship between the depth of the decarburized la...

Embodiment 3

[0031] (1) For the same batch of spring steel with a material of 60Si2Mn and a diameter of φ40, 10 specimens were prepared, each with a length of 100mm. Carry out quenching (the work piece is hardened during quenching)-tempering treatment, so that the depth of the decarburized layer of these 10 pieces is 0.1mm, and measure and record the diameter difference of each sample before and after quenching-tempering. Cut and inspect each sample, measure the depth of the decarburization layer under a metallographic microscope, select the samples with the depth of the decarburization layer within 0.1±0.01mm, and calculate the average of the difference between the diameters of these samples before and after quenching and tempering Value and record.

[0032] (2) Take 10 samples each three times in sequence to make the depth of the decarburized layer of these samples reach 0.2mm, 0.3mm, 0.4mm respectively. Repeat the above test to obtain the relationship between the depth of the decarburized l...

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Abstract

This invention discloses one spring steel carbon layer removing depth test method, which belongs to thermal process carbon layer depth lossless test technique field, wherein it uses spring steel part for quenching and annealing organization change to rouse size change to test parts diameter before and after thermal process; its processes the test in the thermal process according to its diameter difference values.

Description

Technical field [0001] The invention relates to a method for detecting the depth of a decarburized layer of spring steel, belonging to the technical field of non-destructive detection of the depth of a decarburized layer of spring steel in a heat treatment process. Background technique [0002] Spring parts usually made of spring steel are used directly after heat treatment without further processing. The surface layer of such parts will inevitably decarburize and soften during the heat treatment process. The so-called decarburization refers to the phenomenon that the steel surface loses all or part of its carbon under the action of the furnace atmosphere during the hot working or heat treatment of the spring steel, which causes the carbon content of the steel surface to decrease compared to the inside. [0003] The surface decarburization of steel parts has a great influence on the final performance of the spring. Decarburization of the steel surface will seriously damage its fa...

Claims

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Application Information

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IPC IPC(8): G01N33/20G01B21/10
Inventor 张励忠邢书明鲍培伟陈文辉
Owner BEIJING JIAOTONG UNIV
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