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700~1300℃（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1300℃，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 700-1300℃(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.
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