Investigation of Cross Section Microstructure of the Steel Bar With Micro Alloying Controlled Rolling and Controlled Cooling Technique
CAO Chong1,ZOU Rong1,WU Guang-yao1,CHEN Wei2
1. Technology and Quality Department of Wukun Xinxing Steel Co., Ltd., Yuxi 653104, Yunnan, China 2. Technology Center of Wukun Steel Co., Ltd., Kunming 650302, Yunnan, China
Abstract:The cross section microstructure of the steel bar with micro alloying controlled rolling and controlled cooling technique as well as the reasons of different compositions to the microstructures were investigated. It is found that the segregation of elements (P,Si and Mn et al.) distributes like stripping which results in the such stripping microstructure for steel 20MnSi and 20MnSiV during rolling. The 20MnSiNb steel can not be recrystallized below 1050℃ for the pinning by Nb and its compound containing C and N elements. The proeutectoid ferrite is formed homogemously in grain boundaries of deformation austenite and interior of deformation zone, then, the pearlite belt is separated out in grain boundaries of deformation austenite (between the grain boundaries proeutectoid ferrite and austenite). The bainite strip is generated in the grain of deformation austenite during last cooling stage. The proper order precipitation of the microstructure of the samples shows as follow: grain boundaries of deformed austenite and deformed band of deformed austenite, segregation of elements, grain boundaries of recrystallization austenite.
收稿日期: 2012-08-17
出版日期: 2013-06-18
引用本文:
曹重,邹荣,吴光耀,陈伟. 微合金化控轧控冷钢筋纵向金相组织研究[J]. 钢铁, 2013, 48(6): 61-66.
CAO Chong,ZOU Rong,WU Guang-yao,CHEN Wei. Investigation of Cross Section Microstructure of the Steel Bar With Micro Alloying Controlled Rolling and Controlled Cooling Technique. Iron and Steel, 2013, 48(6): 61-66.