From menu down select "Spring steel". On left up will show menu and now choose e.g . first item and from next offer
the second item. On the right will show, in this case, two pictures and choose e.g . second little picture.
From menu for "Mark of materils" choose e.g . first item and onward e.g . item
"Carbon and Alloy Steel of High Carbon Content" and further choose information source.
After activation this little picture show correspondent microstructure with its description.