低碳钢Q345B大方坯热塑性研究  

Study on the Hot Ductility of Low Carbon Steel Q345B Bloom

作　　者：艾西[1] 孙彦辉[1] 曾亚南[1] 刘瑞宁 刘泳 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]河北钢铁集团石家庄钢铁有限责任公司,河北石家庄050031

出　　处：《钢铁钒钛》2014年第4期103-106,共4页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51274032)资助

摘　　要：采用Gleeble 1500热模拟机对Q345B钢在1×10-4s-1和1×10-3s-1应变速率下的热塑性进行了研究。研究表明:在1×10-4s-1的应变速率下,试样在600～TL℃的温度范围内存在两个脆性区,即高温脆性区,为1 217～TL℃,低温脆性区,为600～930℃;在1×10-3s-1的应变速率下,试样在600～TL℃的温度范围内不存在高温脆性区,仅存在低温脆性区,为600～915℃。影响Q345B钢热塑性的主要因素是S偏析、应变速率、铁素体的析出以及细小的AlN粒子的析出。Hot ductility of low carbon steel Q345 B bloom was tested by Gleeble 1500 thermo-mechanical simulator at the strain rate of 1×10^-4s^-1 and 1×10^-3s^-1 respectively. The results indicated that there were two brittle zones at the temperature ranging from 600 ～ TL℃ when the strain rate was at 1×10^-4s^-1,that is,high temperature brittle zone（ 1 217 ～ TL℃） and low temperature brittle zone（ 600 ～ 930 ℃）. When the strain rate was at 1×10^-3s^-1,however,there was only low temperature brittle zone（ 600～915 ℃） at the temperature ranging from 600 ～ TL℃. The main factors influencing hot ductility of this steel were S segregation,strain rate,proeutectoid ferrite as well as precipitation of fine AlN particles.

关 键 词：低碳钢 热塑性 应变速率 析出物 

分 类 号：TG142.31[一般工业技术—材料科学与工程]