80帘线钢轧后控冷实验研究  

Experimental studies on controlled cooling after rolling of 80 tire cord steel

作　　者：王瑞敏[1] 刘宏玉[1,2] 王洪利[1] 周鹏[1] 

机构地区：[1]武汉科技大学,武汉430065 [2]冶金工业过程系统科学湖北省重点实验室,武汉430065

出　　处：《金属制品》2011年第1期71-76,共6页Metal Products

基　　金：冶金工业过程系统科学湖北省重点实验室(武汉科技大学)开放基金;编号C201017

摘　　要：轧后控冷是80帘线钢盘条关键生产工序,为优化其轧后控冷工艺,利用Gleeble1500D热模拟机进行不同奥氏体加热温度及不同冷速实验,并绘出CCT曲线。结果显示:当冷速为19℃/s时,经815～865℃加热,冷却后的组织均为索氏体+珠光体+极少量铁素体;经940℃加热冷却后马氏体大量增多。冷速为0.5～15.0℃/s时,索氏体体积分数随冷速的提高而增大,冷速超过15.0℃/s时大体保持恒定。冷速在0.5～10.0℃/s时,珠光体组织的片层间距逐渐减小;当冷速超过15.0℃/s后,珠光体组织的片层间距趋于稳定。综合考虑,奥氏体化温度为840℃、风冷速率为20℃/s时,可获得片层间距约69 nm、索氏体体积分数约94%的显微组织。To control cooling after rolling is one of the key production processes of 80 tire cord steel wire rod, for optimi- zing controlled cooling process, a series of experiments involving austenizing temperature and cooling rates after rolling were conducted by using Gleeble 1 500D thermal simulator and CCT curve was plotted. The results show that the metallographic microstructures after cooling are sorbite and pearlite and little ferrite when the heating temperature is between 815 and 865 ℃ and cooling speed is at 19℃/s; the amount of martensite after cooling is increased when temperature is above 940℃. The volume fraction of sorbite is increased with the cooling rate increasing when temperature is above 940℃. The volume fraction of sorbite is increased with the cooling rate increasing between 0.5 and 15.0℃/s, and stays nearly constant when the cooling rate is above 15.0 ℃/s. The interlamellar spacing of pearlite is reduced gradually between 0.5 and 10.0℃/s and keeps stable above 15.0 ℃/s. Considered synthetically, when the austenization temperature is 840℃ and the wind cooling rate is 20℃/s, the microstructures can be obtained that the interlamellar spacing is about 69 nm and the volume fraction of sorbite is about 94%.

关 键 词：帘线钢 CCT曲线 显微组织 控制冷却 

分 类 号：TG356.55[金属学及工艺—金属压力加工]