基于X射线二维衍射图像的晶粒尺寸在线检测方法

基于近年来发展的X射线面探测器技术 ,提出了一种金属板材晶粒尺寸在线检测方法。在细致分析X射线二维衍射几何关系的基础上 ,通过合理采集衍射数据并对其沿方位角积分 ,统计了衍射峰的数量、每个衍射峰的衍射强度和参加衍射的晶粒数目 ,计算了平均衍射强度 ,建立了X射线平均衍射强度与晶粒尺寸之间的关系。以家电用低碳钢板为例 ,在配备面探测器和三维平移样品台的X射线衍射仪上模拟实际工业生产过程 ,用实时采集的衍射图像计算了X射线平均衍射强度和晶粒尺寸。实验和计算结果表明 ,这种方法简单、快速和准确 ,有希望发展成为家电钢板及其它金属板材在工业生产中的晶粒尺寸在线检测技术

A Method of Online Grain Size Measurement Based on X -ray Two- Dimensional Diffraction Frame

Based on the advanced X-ray area detector technology, a method of online grain size measurement in metal sheets has been proposed in the present study. An X-ray diffractometer that equipped with an area detector and XYZ-sample stage is used for measuring the grain size of the household electric steel sheets. The number of diffraction peaks, the intensity of each diffraction peak and the number of grains that take part in diffraction are calculated statistically on the basis of X-ray two-dimensional diffraction geometry conventions. The relationship between the X-ray diffraction average intensity and the grain size of steel sheets is found. The experimental and computational results show that this new method could be developed for the online grain size measurement technology of household electric steel sheets as well as other metal sheets.