High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process
SU Cheng1,2,DONG Fang2
（1. Technical Center, Baotou Iron and Steel Group Corporation, Baotou 014010, Nei Monggol, China 2. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Monggol, China）
Abstract：The high temperature plasticity of micro-alloyed Q345B structural steel containing V, Ti and Nb was investigated. The tensile test was carried out by Gleeble-1500D thermal simulation testing machine, and fracture strength and reduction of area with temperature was analyzed under the condition of strain rate 1.5×10－3s-1 and deformation temperature 700-1300℃(Δt=100℃). The results show that Q345B structural steel exists two brittle zones, the first temperature area (Ⅰ) of brittless is solidification temperature about 1300℃, the third temperature area (Ⅲ) of brittless is 850-740℃. Through observation of fracture morphology and microstructure by scanning electron microscopy and optical microscopy, the cause of fracture was cleared to provide the theoretical guidance for the actual continuous casting process.
收稿日期: 2011-05-06
出版日期: 2012-09-05
引用本文:
宿成,,董方. 微合金Q345B板坯连铸的高温塑性[J]. 钢铁, 2012, 47(8): 65-69.
SU Cheng1,2,DONG Fang2. High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process. Iron and Steel, 2012, 47(8): 65-69.
2012, Vol. 47 
