The results showed that the microstructures in CGHAZ of Ti-treated steel consisted chiefly of grain boundary ferrite,ferrite side plate and intragranular ferrite,but there were only grain boundary ferrite and ferrite side plate in CGHAZ of C-Mn steel.

To decrease the nucleation activation barrier the grain boundary ferrite prefers to nucleate at the prior austenite grain boundaries,which are also potential nucleation sites for the bainite.

The feasibility and prospect for industrialization has been studied for weldable low carbon high strength hot-rolled reinforced bar with grain boundary allotriomorphic ferrite/granular bainite duplex microstruture.

The presence of grain boundary allotriomorphic ferrite can increase the compatible deformation capability of duplex microstructure, improve the crack initiation energy under impact loading; i.

The development of high strength low alloy (HSLA) steel plate is reviewed in this paper, and comments on several typical HSLA steels are presented Based on rolling process and theories of duplex microstructure strengthening and toughening, a new microstructure design for high strength steel plate—grain boundary allotriomorphic ferrite/granular bainite (F GAB /B G ) duplex microstructure is propose

By analyzing the structure of catalyst crystal,the effect of temperature on the lattice structure of catalyst metal and the solubility and diffuse velocity of carbon in catalyst,the effect of other elements added in catalyst metal on the activity of carbon and the effect of separating energy,crystal interface etc.