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借助电子背散射衍射(EBSD)技术、扫描电镜(SEM)及透射电镜(TEM)技术,分析新型含V的ULC-BH钢在750℃不同退火时间后的微观织构演变及析出行为。结果表明:在750℃退火2 min后,ULC-BH钢织构主要为{111}//ND取向。随着退火时间的增加,{111}<110>织构强度逐渐减弱,而{111}<112>织构强度不断提高,γ织构均匀性变差,{111}面织构整体强度先增大后减弱。研究表明,对于Ti含量较低添加V的高强ULC-BH钢,析出物较少,再结晶退火后不会产生Fe Ti P不利析出物,主要为Ti N、Mn S及二者复合析出物,大部分弥散分布在晶内,极少数析出物在晶界上析出且尺寸相对较大。
The microstructure evolution and precipitation behavior of the new V-containing ULC-BH steel after different annealing time at 750 ℃ were analyzed by EBSD, SEM and TEM. The results show that the texture of ULC-BH steel is mainly {111} // ND after annealed at 750 ℃ for 2 min. With the increase of annealing time, the texture intensity of {111} <110> gradually decreases, while the texture intensity of {111} <112> increases continuously, the uniformity of γ texture becomes worse. The overall intensity of {111} After the big weakening. The results show that there are fewer precipitates for high strength ULC-BH steels with lower Ti content and no unfavorable Fe Ti P precipitates after recrystallization annealing, mainly including Ti N, Mn S and their composite precipitates. Most of the dispersed in the crystal, a very small number of precipitates in the grain boundary precipitation and relatively large size.