HOU Xiao-ying
,
XU Yun-bo
,
ZHAO Yan-feng
,
WU Di
钢铁研究学报(英文版)
The microstructure characteristics and mechanical properties of a low-silicon TRIP steel containing phosphorus and vanadium at different finish rolling temperatures were studied by laboratory hot rolling experiments. Different ratios of multiphase microstructure (ferrite, granular bainite and retained austenite) are obtained. With a decrease in finish rolling temperature, the volume fractions of ferrite and retained austenite increase. EBSD analysis reveals that most of the ferrite grains are fine, and decreasing of finish rolling temperature leads to an increase in low angle boundaries. Under the joint effects of fine grain strengthening, dislocation strengthening and precipitation strengthening, higher strength is obtained. When the finish rolling temperature is decreased to 800 ℃, the steel has excellent mechanical properties: Rp02=470 MPa; Rm=960 MPa; Rp02/Rm=049; A50=197%; n=025.
关键词:
hot rolling
,
low silicon
,
TRIP steel
,
phosphorus
,
vanadium
,
EBSD
,
precipitation
葛军亮
,
程子建
,
程树森
,
郑跃强
,
李积鹏
,
邹明
钢铁研究
doi:10.13228/j.boyuan.issn1001-0963.20130370
借助于动态显式有限元软件ABAQUS/Explicit,模拟了CSP热轧过程中,板坯厚度方向上不同位置处直径为50μm的Al2O3夹杂物周围孔洞的形成和演变过程.结果表明,对于不同位置处的Al2O3夹杂物,在它们沿轧制方向的前、后部位都形成了孔洞,但前孔洞面积大于后孔洞面积;夹杂物越靠近板坯表面,形成的孔洞越大;热轧过程中,孔洞的演变是一个“愈合—长大—愈合”的动态过程;随着道次的增加,夹杂物前、后孔洞在轧制方向上的投影长度变化与面积变化趋势相一致,而与孔洞尖端夹角的变化趋势恰好相反;孔洞在热轧过程中发生转动,导致前孔洞尖端朝着带钢表面扩展.模拟结果有助于揭示夹杂物周围孔洞与表面缺陷的关系,并为实际生产提供理论指导.
关键词:
热轧
,
夹杂物
,
孔洞
,
显式动力学
,
有限元
陈斌锴，张启富
,
江社明，郝晓东
钢铁
通过TEM和EDS对汽车用热镀锌440MPa级高强IF钢热轧和不同退火工艺条件下的析出物的形貌、分布和成分特征进行研究，并分析了退火工艺参数对析出物的影响。结果表明，热轧和退火得到的析出物主要有TiN、NbC、TiC、Fe(Ti+Nb)P等。退火后的析出物数量都明显多于热轧板中的析出物数量，并且随着退火温度的升高和保温时间的延长，原来粗大析出物细化、分解，而原来细小析出物得以粗化、长大。
关键词:
热轧
,
annealing process
,
precipitation
