高碳帘线钢的冷却相变行为  

Phase transformation behavior of high-carbon cord steel during cooling

作　　者：褚峰 沈奎 胡显军 张继明 Chu Feng;Shen Kui;Hu Xianjun;Zhang Jiming(Institute of Research of Iron&Steel,Shasteel,Zhangjiagang Jiangsu 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《金属热处理》2023年第2期79-84,共6页Heat Treatment of Metals

摘　　要：利用热模拟机Gleeble-3800测定了高碳帘线钢的动态CCT和TTT曲线,研究了冷却速度和等温转变温度对组织性能的影响。结果表明,连续冷却时,形成晶界渗碳体的临界冷速为1.5℃/s,形成马氏体组织的临界冷速为11℃/s。等温转变时,珠光体转变的温度区间为600~700℃,当温度为625℃时,转变时间最短。等温温度升高,相变时间延长,等温温度降低则会形成贝氏体等异常组织。实际采用斯太尔摩控冷时,将吐丝温度控制为900℃,开启前5台风机,风量分别为100%/100%/80%/50%/30%,保证相变冷速在5~7℃/s,且在相变前尽快通过网状碳化物形成的区间,可以得到组织性能满足技术要求的高强帘线钢。CCT curves and TTT curves of a high-carbon cord steel were investigated by using the Gleeble-3800 thermal simulator, and the effects of cooling rate and isothermal transformation temperature on microstructure and properties were studied. The results show that during the continuous cooling process, the critical cooling rates for the formation of grain boundary cementite and martensite are 1.5 ℃/s and 11 ℃/s, respectively. For the isothermal transformation, the temperature range of pearlitic transformation is 600-700 ℃, the transformation time is the shortest at 625 ℃. The higher the isothermal temperature, the longer the phase transformation time, but when the isothermal temperature decreases, the abnormal structure bainite forms. By actually using the Stelmor controlled cooling technique, controlling the spinning temperature at 900 ℃, and starting the first five fans with air volume being 100%/100%/80%/50%/30% respectively, so that the phase transformation cooling rate is controlled as 5-7 ℃/s and the network carbide forming interval can be passed through as soon as possible before the phase transformation, then the high-strength cord steel with microstructure and properties meeting the technical requirements can be produced.

关 键 词：帘线钢 连续冷却 等温转变 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]