X100管线钢的工艺控制  

Process development of X100 pipe line steel

作　　者：贾书君 刘清友 彭伶俐 曲鹏[2] 

机构地区：[1]中国钢研科技集团公司,北京100081 [2]本溪钢铁集团公司,辽宁本溪117000

出　　处：《材料热处理学报》2011年第11期28-33,共6页Transactions of Materials and Heat Treatment

基　　金：国家"十一五"支撑计划"高品质中厚板生产技术"项目子课题"高品质管线钢的研制"(2006BAE03A15)

摘　　要：利用热模拟、扫描电镜、透射电镜等分析手段研究了控轧工艺和冷却制度等对X100管线钢微观组织和显微硬度的影响。结果表明:在820℃变形时,随变形量增加,试验钢中板条贝氏体比例减少,粒状贝氏体比例增加,组织逐渐细化,显微硬度明显下降;400℃终冷时,随冷却速度的增加,粒状贝氏体组织逐渐细化,马奥岛数量减少,颗粒尺寸减小,显微硬度增加;在600～350℃范围终冷时,随终冷温度降低,贝氏体组织细化,马奥岛体积分数减少,颗粒尺寸减小,终冷温度降低到300℃时,组织中出现了大量硬相的板条贝氏体组织;显微硬度随着终冷温度的降低而增加。Effects of rolling and cooling processes on microstructure and microhardness of X100 pipeline steel were investigated by means of thermal simulation,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The results show that processing parameters have significant influence on both microstructure and mechanical properties of the steel.The volume fraction of bainitic ferrite decreases,whereas that of granular bainite increases with increasing deformation in the range of 20%-40%.At the same time,microstructure is refined and hardness is reduced obviously.When the finish cooling temperature is 400 ℃,granular bainite is refined and microhardness of the steel increases with increasing cooling rate,at the same time the volume fraction of M-A islands decreases and the grain size of M-A islands is refined.Granular bainite and M-A islands are both refined,and the volume fraction of M-A islands is reduced with decreasing finish cooling temperature in the range of 600-350 ℃,a large amount of bainitic ferrites in the steel is observed when the finish cooling temperature is 300 ℃.Hardness increases with the decrease of finish cooling temperature.

关 键 词：变形量 冷却速度 终冷温度 微观组织 显微硬度 

分 类 号：TG142.4[一般工业技术—材料科学与工程]