Method for detecting residual austenite in steel plate on line

Abstract

The invention provides a method for detecting residual austenite in a steel plate on line. An X-ray diffraction method is adopted and the method comprises the following steps of: firstly, placing an X-ray tube, an X-ray probe and an angular instrument at a position close to a tension wheel in a production line where a steel band passes; arranging the X-ray tube and the X-ray probe on the same angular instrument, and keeping the focal point of the X-ray tube, the surface of the steel band and a receiving gap on the same diffraction focal circle so that the surface of the steel band and the central line of the angular instrument are coplanar, wherein the X-ray tube and the X-ray probe which are relative to the surface of the steel band rotate at the same angular speed, and the surface of the steel band is always tangent with the diffraction focal circle; and recording the diffraction intensity of an X-ray by using a computer and calculating the quantity of the residual austenite and the carbon content in the residual austenite. By the method, the quantity of the residual austenite and the carbon content in the residual austenite in high-intensity steel plates such as TRIP, Q&P and the line can be detected in real time on line; and guarantee can be provided for correctly regulating and controlling the quantity of the residual austenite and the carbon content in the residual austenite in the high-intensity steel plates.

Description

technical field [0001] The invention relates to detection technology, in particular to an online detection method for residual austenite in steel plates. Background technique [0002] As the world's energy tensions intensify, it is becoming more and more urgent to develop lightweight automobiles. One of the main measures for lightweight automobiles is to use high-strength steel plates. Among them, TRIP steel and Q&P steel are one of the high-strength steel plates for automobiles that are vigorously developed. Japan and other industrialized countries in the world attach great importance to it and conduct research and development one after another. [0003] TRIP (Transformation Induced Plasticity) is phase change induced plasticity steel, which has high tensile strength and ductility, which can reduce the weight of the car and reduce fuel consumption. It also has strong energy absorption capacity and can resist plastic deformation during impact, improving car safety. TRIP st...

AI Technical Summary

Problems solved by technology

[0013] The above-mentioned metallographic structure analysis method, magnetic measurement method and Rockwell and Leeb hardness comparison method can measure the amount of retained austenite, but they cannot measure the carbon content in retained austenite

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