摘要
采用热模拟试验机、高分辨透射电镜及金相显微镜等设备研究了V-Ti试验钢连续冷却相转变和强化机制。结果表明,低冷速下(0.5~1.5℃/s),组织为铁素体和珠光体;冷速增加(1.5~5℃/s),发生贝氏体相变,且贝氏体比例逐渐增加;高冷速状态(5~25℃/s),马氏体出现并逐渐作为主体组织。V-Ti试验钢强化机制主要为析出沉淀强化和细晶强化,晶粒内部弥散析出10~60 nm圆角矩形的V(C,N)+TiN粒子。优化冷速1.0~1.5℃/s开展25 mm HRB600产线试制,屈服强度≥630 MPa,抗拉强度≥820 MPa,断后伸长率≥20%,最大力总伸长率≥11%,强屈比≥1.25。
Continues cooling phase transformation behavior and strengthening mechanisms of the V-Ti containing rebarsteel were systematically studied by thermal simulation testing machine,HR-TEM and OM.The result showed that the microstructure of used rebar was composed of ferrite and pearlite at 0.5~1.5 ℃/s cooling rate;the bainite transformation occurred and the ratio of bainite increased at 1.5~5 ℃/s cooling rate;the martensite structure appeared and gradually become the main structure at 5~25 ℃/s cooling rate.The strengthening mechanisms of V-Ti containing test steel were mainly precipitation strengthening and fine-grain strengthening,and V(C,N)+TiN mainly precipitated as rounded rectangle fine particles dispersing and its size was 10~60 nm.The V-Ti containing rebar was pilot-manufactured by using cooling rate of 1.0~1.5 ℃/s,which shows yield strength above 630 MPa,tensile strength above 820 MPa,elongation of 20%,maximum gross elongation of 11%,and the ratio of tensile strength and yield strength of 1.25.
作者
杨晓伟
陈焕德
周云
张宇
朱海涛
徐霞
Yang Xiaowei;Chen Huande;Zhou Yun;Zhang Yu;Zhu Haitao;Xu Xia(Institute of Research of Iron&Steel,Shasteel/Jiangsu Province,Zhangjiagang 215625,Jiangsu,China;Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215625,Jiangsu,China)
出处
《钢铁钒钛》
CAS
北大核心
2020年第3期110-115,共6页
Iron Steel Vanadium Titanium
关键词
高强钢筋
HRB600
V-Ti微合金化
微观组织
连续冷却相变
强化机制
high strength steel rebar
HRB600
V-Ti micro-alloyed
microstructure
continuous cooling phase transformation
strengthening mechanisms
