摘要
采用膨胀法在Gleeble-3500型热模拟试验机上测定了Q420qE桥梁钢以不同冷速连续冷却时的膨胀曲线,并结合显微组织观察和维氏硬度测量,绘制出了试验钢的形变奥氏体连续冷却转变曲线(CCT曲线)。研究表明,随着冷速的增加,试验钢的显微组织由铁素体+珠光体逐步转变为针状铁素体+粒状贝氏体;并初步确定试验钢两阶段变形后的控冷工艺窗口为5~10℃/s。在该冷速范围内,试验钢组织为由针状铁素体、粒状贝氏体和M-A岛构成的多相组织。
By measuring expansion curves of Q420qE bridge steel during continuous cooling at different cooling rates in the Gleeble-3500 thermal simulation testing machine,and combining microstructure observation and Vickers hardness test,the continuous cooling transformation(CCT)curve of deformed austenite of the tested steel was measured.The results showed that with the increase of cooling rates,microstructure gradually changed from ferrite and pearlite to acicular ferrite and granular bainite.In addition,the window of controlled cooling process after the two-stage deformation was 5 to 10℃/s.In this cooling speed range,the microstructure of the tested steel was composed of acicular ferrite,granular bainite and M-A island.
作者
谯明亮
史根豪
王同良
康双双
王青峰
Qiao Mingliang;Shi Genhao;Wang Tongliang;Kang Shuangshuang;Wang Qingfeng(Plate Business Unit,Nanjing Iron and Steel Co.,Ltd.,Nanjing Jiangsu 210035,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao Hebei 066004, China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao Hebei 066004,China)
出处
《上海金属》
CAS
北大核心
2018年第5期28-31,36,共5页
Shanghai Metals
