Figure 5
The image displays a set of five microscopic images, labeled from (a) to (e), illustrating microstructures at varying heat treatment temperatures of four hundred twenty-five degrees Celsius, six hundred fifty degrees Celsius, eight hundred seventy degrees Celsius, and one thousand one hundred fifty degrees Celsius. Images (a), (b), (c), and (d) show samples with a scale bar of five micrometres, except for image (e), which has a scale bar of two micrometres and indicates a boundary defect (BD) with an arrow. In the lower right corner, a graph labeled (f) presents the distribution of inclusion sizes in micrometres, with the percentage fraction plotted on the vertical axis and the inclusion size on the horizontal axis, providing a visual comparison across different heat treatment conditions represented by distinct colors.The angular selective backscattered (ASB) images related to samples printed at 175 W laser power and heat treated at (a) 425°C, (b) 650°C, (c) 870°C, (d)–(e) 1,050°C and (f) the inclusion size distribution under selected conditions