Grain boundary ferrite,

Polygonal ferrite,

Ferrite with unaligned second phase has no second phase,

Ferrite with a second phase arrangement arranges the second phase,

Ferrite with a second phase, second phase ferrite,

The original austenite grain width is prior to the bulk crystal width.

Ferrite all-welded metal Ferrite is all-welded metal,

Charpy V-notch test is a V-groove test,

Vickers hardness,

Columnar crystallization zone