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Method for measuring depth of TRIP steel surface decarburized layer

A decarburization layer and depth testing technology, which is applied in the fields of steel heat treatment and X-ray diffraction analysis, can solve the problem of insufficient boundary between the transition zone of the decarburization layer and the matrix, and achieve the effect of simple operation

Inactive Publication Date: 2020-04-17
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring the depth of the decarburization layer on the surface of TRIP steel, which solves the problem that the current technology needs to manually determine the insufficient boundary between the transition zone of the decarburization layer and the matrix through metallographic measurement.

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  • Method for measuring depth of TRIP steel surface decarburized layer
  • Method for measuring depth of TRIP steel surface decarburized layer

Examples

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Embodiment 1

[0020] A method for measuring the depth of decarburization layer on the surface of TRIP590 steel, the specific steps and parameters are as follows:

[0021] 1. Sample preparation: Process the sample from TRIP590 steel plate, and the sample specification requirements are: length 20mm×width 20mm×thickness 2mm;

[0022] 2. Put the processed sample in alcohol and clean it with ultrasonic waves for 3 minutes;

[0023] 3. Use an X-ray diffractometer to measure the residual austenite content value V on the surface of the sample 1 0.5%; the parameters of the X-ray diffractometer are: the scanning range 2θ is 45~115o, the scanning step is 0.02o, and the scanning speed is 1.5o / min;

[0024] 4. Use P1500 silicon carbide water-resistant sandpaper to grind off the surface of the sample by 0.03mm along the thickness direction, and then use the X-ray diffractometer to measure the residual austenite content value V on the surface of the sample again. 2 1.1%, measure the depth of the sample ...

Embodiment 2

[0032] With the same method of embodiment 1, measure the decarburization depth of other TRIP steel surfaces as shown in table 2:

[0033] Table 2

[0034] steel type TRIP690 TRIP780 TRIP980 Decarburization depth, mm 0.25 0.18 0.21

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Abstract

The invention discloses a method for measuring the depth of a TRIP steel surface decarburized layer, and belongs to the technical field of steel heat treatment and X-ray diffraction analysis. The method comprises the following specific steps and parameters: firstly, preparing a TRIP steel sample; measuring the content value V1 of retained austenite on the surface of the sample by adopting an X-raydiffractometer after cleaning; repeatedly polishing the surface of the sample by using silicon carbide waterproof abrasive paper until the test depth is 1 / 4 of the thickness of the sample, and drawing a change curve graph by taking D as an abscissa and V as an ordinate; measuring and calculating the average value VA on the curve graph; and finally, finding out a point A of which the vertical coordinate is equal to VA on the curve, and taking DA as the horizontal coordinate corresponding to the point A as the decarburization layer depth of the sample surface to finish the test. The method hasthe advantages that operation is easy and convenient, and the defect that in the prior art, a decarburization layer transition area and a matrix boundary need to be judged manually can be overcome.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and X-ray diffraction analysis of steel, in particular to a method for measuring the depth of decarburization layer on the surface of TRIP steel. In particular, it relates to a method for measuring the depth of a decarburization layer on the surface of TRIP steel by using an X-ray diffractometer. Background technique [0002] In a high temperature environment, steel in the oxidizing medium oxygen, CO 2 When heated in water, etc., the carbon in the surface of the steel reacts with it, and the gas generated escapes out of the steel, reducing the carbon concentration in the surface of the steel, which is often referred to as "decarburization". When the decarburization is serious, all the surface layer of the steel can be turned into ferrite, resulting in a decrease in the mechanical properties of the workpiece, or even scrapping. Therefore, in the actual use of steel, a certain margin must b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20G01N23/2005
CPCG01N23/20G01N23/2005
Inventor 崔桂彬贾惠平来萍温娟鞠新华
Owner SHOUGANG CORPORATION