Mechanical properties and microstructural characters of hot--rolled plates of an acicular ferrite steel for line pipe
一种针状铁素体钢热轧板材的结构与力学性能

Mechanical properties and microstructural characters of hot-rolled plates of an aci-cular ferrite steel for line pipe were investigated by transmission electron micrographs (TEM). The experimental results showed that hot-rolled plates of the acicular ferrite steel for line pipe possess excellent strength and toughness behaviors. Moreover, its microstructural characters possess several configurations under TEM, which are (1) ferrite laths with obvious interface, (2) ferrite laths without obvious interface, but the interface can be discerned faintly from the linear arrangment of those directional islands, (3) the coexistence of ferrite laths and non-equiaxed grains. These are somewhat different from those of weld structures, which are generally thought to consist of an assemblage of interwoven ferrite laths.