Tissue quantitative analysis method for TRIP steel

A quantitative analysis and organization technology, applied in material analysis using radiation diffraction, material analysis using measurement of secondary emissions, preparation of samples for testing, etc. The problem of high equipment requirements, to achieve the effect of small human interference factors, low operator requirements, and simple and easy operation

Active Publication Date: 2013-12-11
CHINA WEAPON SCI ACADEMY NINGBO BRANCH +1
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  • Application Information

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Problems solved by technology

First, it requires high equipment, and it needs to be carried out on a scanning electron microscope equipped with a backscattering diffraction device; second, the operation process and data processing are complicated

Method used

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  • Tissue quantitative analysis method for TRIP steel
  • Tissue quantitative analysis method for TRIP steel

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[0019] The present invention will be described in further detail below in conjunction with the embodiments of the drawings.

[0020] The chemical composition (mass fraction, %) of TRIP steel is: C0.31, Si1.86, Mn1.86, Nb0.035 and the rest is Fe. The experimental TRIP steel was kept at 1180°C for 1.5 hours. It was rolled into a 12mm plate in the two-roller reversible hot rolling mill of the National Iron and Steel Rolling Center of University of Science and Technology Beijing through a controlled rolling and controlled cooling process. The sample was taken along a section parallel to the rolling direction and ground After preparation and polishing, the sample was corroded with a weight ratio of 4% nitric acid alcohol solution. The microstructure was observed on the scanning electron microscope S-4300, and the Image-Pro Plus6.0 software was used to analyze and count the metallurgical phase ratios; The experimental TRIP steel was tested by XRD. The experimental conditions were Cu Kα...

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Abstract

The invention discloses a tissue quantitative analysis method for TRIP steel. The tissue quantitative analysis method comprises the following steps: firstly, preparing the TRIP steel into a metallographic specimen; secondly, grinding and polishing the metallographic specimen and then corroding the polished metallographic specimen with 4-8 percent nital solution for 8-30 seconds, observing a polyphase structure of the TRIP steel under a scanning electron microscope, and analyzing and counting to obtain the quantitative ratio of the ferrite content to bainite to residual austenite mixed tissue by using the scanning electron microscope according to a quantitative metallographic method through Image-ProPlus software; thirdly, carrying out XRD (X Ray Diffraction) atlas analysis on the same metallographic specimens to determine the content of residual austenite in the polyphase structure; fourthly, finally determining the phase proportions of various tissues in the TRIP steel by combining the quantitative analysis result of the SEM with the measurement result of the XRD. Compared with the prior art, the tissue quantitative analysis method disclosed by the invention has the advantages of simplicity and convenience in operation and accurate measurement.

Description

technical field [0001] The invention relates to a method for analyzing the contents of various structures in TRIP steel. Background technique [0002] TRIP (Transformation Induced Plasticity—Transformation Induced Plasticity) steel plate was developed in recent years to meet the needs of the automotive industry for new high-strength, high-plasticity steel plates. TRIP steel plate was first discovered and named by V.F. Zackay. Its superior performance mainly comes from the reasonable proportion of multi-phase structure in steel and the principle of phase transformation induced plasticity. The high strength comes from the joint contribution of martensite, bainite and alloying element solid solution strengthening, and the high plasticity depends on the complementary advantages of the three-phase structure of retained austenite, bainite and ferrite. Therefore, this steel has the characteristics of low yield strength, high strain hardening rate, high strength after forming, and ...

Claims

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Application Information

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IPC IPC(8): G01N23/20G01N23/22G01N1/32
Inventor 高永亮胡士廉胡俊吕彦袁书强田雨江陈巍
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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