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本文研究了控轧钢的显微组织、形貌,认为控轧钢理想的组织是:晶粒细小的铁素体加珠光体;珠光体的含量不要过高,微小的碳氮化物起沉淀硬化作用。Nb、V微合金化钢的沉淀析出相是Nb(CN)和(Nb,V)(CN),晶格常数在 4.19A～4.28A之间。一般在—60℃～60℃之间出现的断口“分离”现象,可能是在低于 Ar_3~-两相温度区间进行控扎,使铁素体(001)//[011]结晶织构沿控轧面平行发育,削弱了铁素体晶粒强度,形成了分离的削弱面。
In this paper, the microstructure and morphology of controlled rolling steel are studied. The ideal microstructure of controlled rolling steel is considered as follows: fine grain ferrite plus pearlite; pearlite content should not be too high, and tiny carbonitride will precipitate and harden. The precipitation phases of Nb and V microalloyed steels are Nb (CN) and (Nb, V) (CN) with lattice constants between 4.19A and 4.28A. The phenomenon of “separation” of fractures, which occurs between -60 ℃ and 60 ℃, may be controlled at a temperature lower than the Ar_3 ~ -phase of the two phases so that the texture of the ferrite (001) // [011] Controlled rolling surface parallel development, weakening the ferrite grain strength, the formation of a separate weakened surface.