有色金属科学与工程Issue(3)：61-66,87,7.DOI:10.13264/j.cnki.ysjskx.2015.03.012
Q345B低碳高强度钢的高温塑性
Hot ductility of low carbon high strength steel Q345B
摘要
Abstract
The hot ductility of low carbon high strength Q345B was determined using thermal analogue machine Gleeble-3500. The precipitates, fracture surface and microstructure of tested samples were observed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and optical microscopy (OM). The fracture mechanisms were analyzed. The results show that there are three regions between 1 350 ℃ and 650 ℃. The temperature range of regionI is from melting point to 1 307 ℃. The fracture mode is intergranular fracture caused by the segregation of S and O. The temperature range of regionII is from 1 307 ℃ to 920 ℃. The occurrence of dynamic recrystallization leads to the intragranular fracture. The temperature range of regionIII is from 920 ℃ to 650 ℃. The fracture mode is intergranular fracture caused by the pinning effect of precipitates and the precipitation of pro-eutectoid ferrite along the austenite grain boundaries. The results provide the theoretical basis for the production of continuous casting.关键词
高温塑性/析出物/沿晶断裂/穿晶断裂/先共析铁素体Key words
hot ductility/precipitates/intergranular fracture/intragranular fracture/pro-eutectoid ferrite分类
矿业与冶金引用本文复制引用
刘伟建,王春苗,余璐,祁永峰..Q345B低碳高强度钢的高温塑性[J].有色金属科学与工程,2015,(3):61-66,87,7.基金项目
国家自然科学基金资助项目 （）
