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Display method of quenched original austenite grain boundaries of low-carbon steel

A technology of austenite grain boundary and display method, which is applied in the direction of measuring devices, instruments, particle size analysis, etc., and can solve the problem that the original austenite grain size cannot be accurately calculated

Inactive Publication Date: 2019-01-29
SHOUGANG CORPORATION
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for displaying the grain boundaries of prior austenite in the quenched state of low carbon steel, which solves the problem that the size of prior austenite grains cannot be accurately calculated in physical testing

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  • Display method of quenched original austenite grain boundaries of low-carbon steel
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  • Display method of quenched original austenite grain boundaries of low-carbon steel

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Embodiment 1

[0015] In this embodiment, the accurate austenite grain size is calculated after the low-carbon Nb-containing steel has a carbon content of 0.88wt%, and the size, shape and distribution characteristics of the quenched prior austenite grains are clearly displayed. The specific technical steps and parameters are:

[0016] 1. Sample preparation: The sample is a low-carbon steel quenched sample. The sample size requires a length of 10mm, a width of 8mm, and a thickness of 2mm. The upper and lower surfaces are guaranteed to be parallel. The residual stress is removed by electrolytic polishing on the surface, and finally a flat, clean and bright surface is obtained. Surface scanning of polished surfaces.

[0017] 2. Electron microscope parameters: In order to obtain a clearer Kikuchi pattern, it is necessary to set the parameters of the electron microscope. According to the EBSD analysis, the parameters of the electron microscope are acceleration voltage 15kV, beam current 5nA, sam...

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Abstract

The invention discloses a display method of quenched original austenite grain boundaries of low-carbon steel, and belongs to the technical field of physical detection of original austenite grain boundaries in steel. The display method comprises the specific steps and parameters that first a sample is prepared, the sample is a quenched sample of the low-carbon steel, C is less than or equal to 0.1wt%, and an obtained polished surface is subjected to surface scanning; parameters of an electron microscope are set such as the acceleration voltage is 15kV-20kV; a setting principle of the step sizein the setting of the scanning parameters is not more than one tenth of an average grain size; and after the surface scanning is finished, data results are processed, the grain boundary orientation difference between martensitic lath and original austenite is analyzed, the value range of the grain boundary orientation difference is 20-50 degrees, and the size of an original austenite grain is calculated. The display method has the advantages that the size of the original austenite grain can be accurately calculated by the method, and an important theoretical basis for studying the microstructure evolution in the phase transition process is provided.

Description

technical field [0001] The invention belongs to the technical field of physical detection of the original austenite grain boundary in steel, in particular to a method for displaying the quenched original austenite grain boundary of low carbon steel. This method uses electron backscattered diffraction EBSD technology to outline the outline of the original austenite grain boundary, and accurately calculates the size of the original austenite grain by clearly showing the size, shape and distribution of the austenite grain . Background technique [0002] The grain size of the original austenite in the steel plays a very important role in the optimization of its mechanical properties such as strength and toughness. It plays an important role in the study of the phase transformation law of the steel structure during the heat treatment process, as well as the relationship between the structure evolution and the mechanical properties. , so the detection of prior austenite grain siz...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N23/203G01N23/20058
CPCG01N15/02G01N23/20058G01N23/203
Inventor 崔桂彬鞠新华尹立新孟杨严春莲
Owner SHOUGANG CORPORATION
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