为了研究含V、Ti、Nb微合金Q345B结构钢的高温塑性,利用Gleeble-1500D热模拟试验机对其进行热拉伸试验,分析了在应变速率为1.5×10-3s-1、变形温度700～1 300℃（Δt=100℃）变形条件下的断裂强度和断面收缩率随温度的变化情况。确定Q345B结构钢存在两个脆性区间,即第Ⅰ脆性温度区间为熔点温度1 300℃,第Ⅲ脆性温度区间为850～740℃。通过扫描电镜和光学显微镜对断口形貌及其组织进行了观察,明确了断裂原因,为连铸生产提供一定的理论指导。
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 700-1 300 ℃（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.
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