Method for measuring interval of continuous casting blank dendritic crystal with manganese steel

A technology of dendrite spacing and measurement method, which is applied in the direction of measuring devices, instruments, and wave/particle radiation, can solve the problems of complex experimental process, time-consuming and laborious, and insufficient selection of etching methods, and achieve simple operation , the effect of high accuracy

Inactive Publication Date: 2014-05-14
SHOUGANG CORPORATION
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Problems solved by technology

However, this method has certain difficulties in displaying the solidification structure of continuous casting slabs. Although some commonly used dendrite corrosion methods are recommended in the GB / T226 "Steel Low-magnification Structure and Defect Acid Etching Inspection Method", due to the carbon content, Factors such as alloying elements and rolling reduction have different effects on the display of dendrites. Therefore, for specific continuous casting slabs, a specific etching method is required to better display the dendrite structure. However, the current etching method The selection is not comprehensive and perfect, and analysts are required to conduct multiple tests to determine the specific parameters such as the optimal etching solution ratio, etching time, and etching temperature for the analyzed steel grades. Therefore, the experimental process is complicated and time-consuming.

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  • Method for measuring interval of continuous casting blank dendritic crystal with manganese steel
  • Method for measuring interval of continuous casting blank dendritic crystal with manganese steel
  • Method for measuring interval of continuous casting blank dendritic crystal with manganese steel

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Embodiment Construction

[0018] The specific implementation manner of the present invention will be described below with reference to the accompanying drawings, taking the continuous casting slab of X80 pipeline steel as an example.

[0019] The test process is as follows:

[0020] (1) Sample preparation

[0021] Firstly, a block sample is cut from the center area of ​​the X80 slab cross section ( figure 1 ), the sample size is: length 30mm, width 18mm, thickness 20mm, then the sample is cleaned, ground and polished, and then put into the electronic probe sample chamber for observation and testing.

[0022] (2) Electron probe surface analysis

[0023] Step 1: Open the "Mapping" module of the electron probe analysis software, select the Mn element as the analysis element, set the accelerating voltage to 20KV, the beam current to 500nA, the beam spot size to 1μm, select the analysis area of ​​4mm×2.9mm, and click "Operate" to proceed. Surface scan analysis of Mn element.

[0024] Step 2: After the a...

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Abstract

The invention discloses a method for measuring an interval of a continuous casting blank dendritic crystal with manganese steel and belongs to the technical field of metal material detection. According to the technical scheme, the method comprises the steps that firstly, sample grinding and polishing are conducted; secondly, facial analysis is conducted on manganese in a casting blank through an electronic probe; finally, the interval of the dendritic crystal is measured through a facial distribution map of the manganese. The method has the advantages that the interval between the primary dendritic crystal and the second primary dendritic crystal of the continuous casting blank can be accurately measured and the measuring method is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, and in particular relates to a method for measuring the dendrite spacing of manganese-containing steel continuous casting slabs. technical background [0002] During the solidification process of molten steel, the growth in the form of dendrites is a main method, which can be divided into primary dendrites and secondary dendrites according to the order of crystal growth during solidification. The trunk of dendrites that grow first along the direction of heat transfer is called primary dendrites, and the distance between the trunks of dendrites (primary dendrites) that first precipitate along the direction of heat flow and grow parallel to each other is called primary dendrite spacing. On the primary dendrite trunk, the distance between the secondary dendrites growing perpendicular to the trunk growth direction is called the secondary dendrite spacing. The dendrite spacing is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/00
Inventor 严春莲鞠新华温娟史学星
Owner SHOUGANG CORPORATION
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