通过Gleeble热模拟方法研究了Ti和B对耐候焊丝钢的CCT行为影响规律.组织分析表明:在冷却速度为0.1～1℃/s时,将Ti质量分数从0.05％增加到0.10％后,相转变的开始和结束温度分别降低12和37℃,同时组织中TiN颗粒数量增加,也将产生M-A组元的临界冷却速度从0.5℃/s降低到0.2℃/s；继续添加0.002％B会进一步将相转变的开始和结束温度分别降低约26和60℃,同时增加相转变组织中的M-A组元的体积含量和尺寸,也将产生M-A组元的临界冷却速度从0.2℃/s降低到0.1℃/s.硬度数据表明:把Ti质量分数从0.05％增加到0.10％后,盘条强度增加约56 MPa;继续添加质量分数0.002％的B后,盘条强度将再增加78MPa.
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