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Method for detecting nonmetallic inclusions in steel

A technology for non-metallic inclusions and detection methods, applied in the field of smelting, can solve problems such as crushing, time-consuming, and complicated extraction process of inclusions, and achieve the effect of avoiding re-precipitation.

Pending Publication Date: 2020-10-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When mechanical grinding and polishing combined with optical microscopy and scanning electron microscopy are used to characterize non-metallic inclusions in steel, in the process of mechanical grinding and polishing, the morphology characteristics of non-metallic inclusions will inevitably be destroyed or relatively complete characterizations will not be possible. Characteristics of non-metallic inclusions
In addition, during the grinding and polishing process, some non-metallic inclusions will fall off or break, seriously affecting the accuracy and validity of the characterization results
Although the method of extracting inclusions to characterize the quantity, composition and appearance of inclusions can completely present the appearance, composition and quantity characteristics of non-metallic inclusions, the extraction process of inclusions is relatively complicated and time-consuming, and different steel materials need to correspond Specific extraction liquid or electrolyte, and the extraction process is sensitive to the temperature environment

Method used

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  • Method for detecting nonmetallic inclusions in steel
  • Method for detecting nonmetallic inclusions in steel
  • Method for detecting nonmetallic inclusions in steel

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The steel detected in this embodiment is CLAM steel, and the method for detecting non-metallic inclusions in the steel comprises the following steps:

[0041] (1) Test sample pretreatment

[0042] The sample is selected from the ingot of CLAM steel, and the diameter d is cut from the slab by wire cutting 1 = 1cm, length l 1 = 10cm round bar sample; place the round bar sample at 1100°C for 1.5h and then water-cool, and dry the sample as soon as possible after cooling; use a lathe to cut out the diameter d in the middle of the sample after cooling 2 = 5mm long l 2 = 5cm round bar sample, clean the round bar sample for use.

[0043] (2) Non-metallic inclusions are peeled off from the matrix

[0044] The pretreated round bar sample was subjected to tensile failure to peel the inclusions from the matrix and expose the inclusions.

[0045] (3) Morphology and composition detection of non-metallic inclusions

[0046] The sample is processed into a size that can be placed in...

Embodiment 2

[0054] The steel detected in this embodiment is SCRAM, and the method for detecting non-metallic inclusions in the steel comprises the following steps:

[0055] (1) Test sample pretreatment

[0056] The sample is selected from the ingot of SCRAM steel, and the diameter d is cut from the billet by wire cutting 1 =1.5cm, length l 1 = 5cm round bar sample; place the round bar sample at 1200°C for 1.5h and then water-cool, and dry the sample as soon as possible after cooling; use a lathe to cut out the diameter d in the middle of the sample after cooling 2 = 3mm long l 2 = 1 for the round bar sample, clean the round bar sample for use.

[0057] (2) Non-metallic inclusions are peeled off from the matrix

[0058] The pretreated round bar sample was subjected to tensile failure to peel the inclusions from the matrix and expose the inclusions.

[0059] (3) Morphology and composition detection of non-metallic inclusions

[0060] The sample is processed into a size that can be pla...

Embodiment 3

[0068] The steel detected in this embodiment is ARAA steel, and the method for detecting non-metallic inclusions in the steel comprises the following steps:

[0069] (1) Test sample pretreatment

[0070] The sample is selected from the steel ARAA ingot, and the diameter d is cut from the ingot by wire cutting 1 =1.25cm, length l 1 = 7.5cm round bar sample; place the round bar sample at 1150°C for 1.25h and then water-cool, and dry the sample as soon as possible after cooling; use a lathe to cut out the diameter d in the middle of the sample after cooling 2 = 4.5mm long l 2 =1.25 for the round bar sample, clean the round bar sample for use.

[0071] (2) Non-metallic inclusions are peeled off from the matrix

[0072] The pretreated round bar sample was subjected to tensile failure to peel the inclusions from the matrix and expose the inclusions.

[0073] (3) Morphology and composition detection of non-metallic inclusions

[0074] The sample is processed into a size that ca...

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Abstract

The invention discloses a method for detecting nonmetallic inclusions in steel. The method comprises the following steps: S1, sampling from an ingot or casting blank of to-be-detected steel, preparinga tensile sample, heating and insulating the tensile sample to carbonize and dissolve the tensile sample, then quickly cooling, and cleaning the surface to obtain a to-be-detected tensile sample; S2,carrying out tensile failure on the to-be-detected tensile sample; and S3, observing the morphology of the non-metallic inclusions in the tensile fracture by adopting SEM, measuring the sizes of thenonmetallic inclusions, carrying out statistics, detecting the components of the nonmetallic inclusions by adopting EDS, and analyzing the components of the inclusions in each size section according to an EDS result so as to realize the detection of the nonmetallic inclusions in the steel. The detection means is simple and convenient, the morphology of the nonmetallic inclusions in the steel is not damaged, and the research of the quality of steel products by the nonmetallic inclusions in the steel is facilitated.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for detecting non-metallic inclusions in steel. Background technique [0002] As an important factor affecting the quality of steel products, non-inclusions often have a profound impact on product performance. From non-metallic inclusions found in steel and considered harmful and should be reduced as much as possible to the use of some inclusions to improve and improve the quality of steel, non-metallic inclusions have always been an important evaluation index for steel products, and are also a research topic in the field of iron and steel smelting. focus. In order to study the characteristics of non-metallic inclusions, that is, the distribution, morphology and composition of inclusions, the following two methods are generally used for characterization at this stage. One is to use mechanical grinding and polishing to make the surface of the steel meet certain requirem...

Claims

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Application Information

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IPC IPC(8): G01N33/2022G01N1/28G01N1/44
CPCG01N33/2022G01N1/286G01N1/44
Inventor 邱国兴刘诗薇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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