应该是"粗大铁素体". % D4 t- x, Y2 F4 M* B" oAluminum oxide and Titanium nitride could not promote the formation of acicular ferrite. Microstructure of coarse-grain HAZ of Al treated steels consists of heavy ferrite in grain boundaries and ferrite id plat.(Ai的氧化物和TiN不能促进晶内铁素体的形成,焊接粗晶区主要由粗大的晶界铁素体和平行排列的侧板条铁素体组成)。# ?. ?" j# m( t9 L$ `) O
不知是否同意???