Burbelko Andriy, Wiktor Tomasz, Garbacz-Klempka Aldona, Ziółkowski Eugeniusz
Faculty of Foundry Engineering, AGH University of Krakow, 23 Reymonta Str., 30-059 Krakow, Poland.
Materials (Basel). 2024 May 14;17(10):2322. doi: 10.3390/ma17102322.
To perform quality assessments of both metal alloys and many other engineering materials, measurements of the volume fractions of phases or microstructure components are utilized. For this purpose, quantitative analysis of the evaluated components' distribution on metallographic specimens is often employed. Phases or components of the microstructure are identified based on the variation in signal received in the band of light seen. Problems with the correct identification of measurement results in this spectral band can be caused by the inhomogeneity of the etching when the alloy components are segregated. Additional uncertainty arises when the analyzed image pixel contains a boundary between grains of different phases. This article attempts to use the results of local chemical composition measurements as a source signal for quantitative evaluation of phase composition. For this purpose, quantitative maps of elemental concentration distributions, obtained with a Tescan Mira GMU high-resolution scanning electron microscope in QuantMap mode, were used as input data for the phase composition evaluation of an EN AC 46000 alloy sample. The X-ray microanalysis signal generation area may contain grains of more than one phase. Therefore, evaluation of the phase fractions in areas of individual measurements were calculated by looking for the minimum of the objective function, calculated as the sum of the squares of the deviations of the results of measurements of the concentration of individual elements from the weighted average values of solubilities of these elements in the phases.
为了对金属合金和许多其他工程材料进行质量评估，需要测量相或微观结构组分的体积分数。为此，通常采用对金相试样上评估组分的分布进行定量分析。根据在可见光谱带中接收到的信号变化来识别微观结构的相或组分。当合金成分偏析时，蚀刻的不均匀性可能会导致在该光谱带中正确识别测量结果出现问题。当分析的图像像素包含不同相的晶粒之间的边界时，会产生额外的不确定性。本文试图将局部化学成分测量结果用作相组成定量评估的源信号。为此，使用在QuantMap模式下通过Tescan Mira GMU高分辨率扫描电子显微镜获得的元素浓度分布定量图，作为EN AC 46000合金样品相组成评估的输入数据。X射线微分析信号产生区域可能包含不止一个相的晶粒。因此，通过寻找目标函数的最小值来计算各个测量区域中的相分数，目标函数计算为单个元素浓度测量结果与这些元素在各相中的加权平均溶解度偏差的平方和。
