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Quantitative analysis method for volume content of each phase in QP steel

A volume content, martensite technology, applied in the analysis of materials, material analysis through optical means, material analysis using wave/particle radiation, etc., can solve the problems of insufficient contrast and difficult quantitative analysis, etc., to achieve formula Simple, promote product research and development, and stable performance

Active Publication Date: 2022-01-07
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

There are also patents that try to avoid picric acid in advanced high-strength steel color metallographic technology. Chinese patent ZL201810068253.0 discloses a metallographic etchant for the staining of advanced high-strength steel residual austenite and its use. The etchant used is sulfuric acid 3.5 -15%, hydrochloric acid 12-15%, FeCl 3 7-10%, the balance is absolute alcohol, but for complex metallographic structures, the contrast between the phases of this method is usually not obvious enough, it is difficult to carry out accurate quantitative analysis, especially the retained austenite in QP steel Usually relatively small, many distributed between martensitic laths, it is difficult to identify by metallography

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  • Quantitative analysis method for volume content of each phase in QP steel
  • Quantitative analysis method for volume content of each phase in QP steel

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Embodiment 1

[0021] Use the following steps to detect the volume content of each phase of QP steel:

[0022] (1) Preparation of colored metallographic etchant: mix 50mL water and 50mL ethanol, add 3mL concentrated hydrochloric acid, and finally add 5g sodium metabisulfite powder into the mixture, then stir rapidly with a glass rod to completely dissolve the sodium metabisulfite powder, and then add Stand in the fume hood for 2-5min;

[0023] (2) Sample pretreatment: select QP980 steel produced in large industries (martensite volume content is about 60%, ferrite volume content is about 30%, and retained austenite volume content is about 10%) as the research object, and the QP Cut the steel into pieces and cold mount, then grind and polish; use the color metallographic etchant prepared in step (1) to corrode the sample for 10-30 seconds, observe while corroding, when the surface of the sample changes from bright to dark, Then rinse the surface of the sample with plenty of water, and wipe it...

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Abstract

The invention discloses a quantitative analysis method for the volume content of each phase in QP steel, which is characterized in that the volume content of ferrite in the QP steel can be obtained by subtracting the volume content of martensite of the QP steel obtained by a color metallographic method by 100% and then subtracting the volume content of retained austenite of the QP steel obtained by an X-ray diffraction method, and further the volume content of each phase in the QP steel is obtained. The novel coloring agent used in the method does not contain picric acid, is stable in solution performance, high in safety, simple in formula and easy to operate, has a very good dyeing effect on the martensite phase in the QP steel, can enable the martensite phase in the QP steel with a complex metallographic structure and relatively small retained austenite to have relatively obvious contrast with other phases, is clear in outline and easy to recognize, and furthermore, the volume content of each phase in the QP steel can be accurately and quantitatively analyzed according to a color metallographic method and an X-ray diffraction method, finally, a guarantee is provided for identification and quantitative detection of microstructures in the QP steel, research and development of products are promoted, and remarkable economic benefits and social benefits are obtained.

Description

technical field [0001] The invention belongs to the field of quantitative analysis of metallographic microstructures, in particular to a quantitative analysis method for the volume content of each phase in QP steel. Background technique [0002] QP (Quenching and Partitioning, quenching and partitioning) steel is a new type of steel plate developed in recent years to meet the high strength, high plasticity and high formability of the automotive industry. The superior performance of QP steel is mainly due to the phase transformation of retained austenite in the structure during the strain process, which transforms into martensite to produce phase transformation strengthening and plasticity improvement (deformation-induced phase transformation, QP effect), and its microstructure is generally It is composed of ferrite, martensite and retained austenite. [0003] At present, the corrosive agents used for color metallography of advanced high-strength steel are mainly Lepera reag...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/30G01N1/32G01N21/84G01N23/207
CPCG01N1/28G01N1/30G01N1/32G01N21/84G01N23/207G01N2001/302Y02P10/20
Inventor 汪水泽王胜伟毛新平吴桂林杨明岳
Owner UNIV OF SCI & TECH BEIJING
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