X-ray Scattering for Metal Strip Microstructure Characterization
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Solution Overview
Problem
Current methods for characterizing the structure of metal strips or sheets are either invasive and time-consuming, such as micrograph analysis, or provide only indirect qualitative assessments, like ultrasonic scattering, making them unsuitable for integration into ongoing manufacturing processes.
Innovation Solution
A method and device using expanded X-rays with a continuous spectrum to measure the spatially resolved intensity pattern of X-ray radiation scattered from the metal surface, allowing for the determination of grain size, distribution, and orientation without the need for energy resolution, enabling non-destructive, real-time characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micrograph analysis is used to characterize the structure of metal strip or sheet, then the microstructure can be made directly visible, but the preparation of a micrograph is invasive and time-consuming
Solution Approach 1:
The patent replaces the mechanical preparation process (cutting, mounting, polishing, etching) with a non-contact X-ray scattering measurement system. The X-ray source and detector system directly measures the microstructure without any physical contact or preparation of the sample, eliminating the time-consuming mechanical preparation steps while maintaining measurement capability.
Solution Approach 2:
The patent introduces X-ray radiation as an intermediary to probe the microstructure. Instead of directly observing the sample under a microscope after preparation, the X-rays interact with the sample's microstructure and the scattered radiation carries information about grain size and orientation, which is then detected and analyzed to characterize the microstructure.
2Productivity
If ultrasonic scattering is used to characterize the microstructure, then the method is faster and non-destructive, but only allows indirect or qualitative statements about structural properties
Solution Approach 1:
The patent changes the measurement parameters by using X-ray radiation instead of ultrasonic waves, and by measuring the spatial distribution of scattered radiation intensity at multiple angles. This provides more detailed information about grain size, shape, and orientation through the angular dependence of scattering, transforming the measurement from qualitative to quantitative while maintaining speed and non-destructiveness.
Solution Approach 2:
The patent adds the spatial dimension to the measurement by detecting the angular distribution of scattered X-rays. Instead of a single intensity measurement, the system measures intensity as a function of scattering angle, providing additional information about microstructure characteristics such as grain orientation and shape that cannot be obtained from simple ultrasonic scattering.
3Measurement precision
If X-ray diffraction is used to analyze the structure, then structural transformation can be identified, but the radiation intensity is usually rather low and only examines the strip or sheet selectively
Solution Approach 1:
The patent employs a continuous spectrum X-ray source that emits radiation across a range of energies, allowing continuous measurement without the need for monochromatization. This increases the total radiation intensity available for measurement while maintaining the ability to identify structural transformations through analysis of the scattering pattern across different energy ranges.
Solution Approach 2:
The patent creates a measurement system that can characterize multiple microstructure parameters (grain size, grain size distribution, grain orientation) simultaneously through a single scattering measurement. The spatially resolved intensity pattern contains information about various structural features, making the system universal for different types of microstructural characterization without requiring separate measurements or adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a non-destructive, efficient means to assess the microstructure of metal strips or sheets, improving process control in metal processing by offering detailed, spatially resolved information on grain size and orientation, suitable for integration into industrial processes.
Implementation Method 1
a surface of the strip or sheet is irradiated with expanded X-rays during a measurement
Implementation Method 2
the intensity pattern, which includes forward scattering or transmission of the X-ray radiation, is measured
Data Source
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AI summary
The invention relates to a method for characterizing the microstructure of a strip or sheet (8) of metal. The object of providing an improved method for characterizing the microstructure of a strip or sheet of metal is achieved by a method in which a surface area of the strip or sheet (8) is irradiated with x-radiation, wherein the x-radiation at least partially has a continuous spectrum in which the intensity of the x-radiation scattered by the strip or sheet (8) is measured in a spatially resolved manner so as to obtain a spatially resolved intensity pattern, and in which an output variable dependent on the measured intensity pattern is determined and output. The invention also relates to a device (2) for characterizing the microstructure of a strip or sheet (8) of metal, in particular for use in a method according to the invention, comprising at least one x-ray source (4), which is designed to irradiate a surface area of a strip or sheet (8), wherein the x-radiation has an at least partially continuous spectrum. The invention also relates to a metal processing installation, in particular a rolling train for rolling a strip or sheet (8) of metal.