采用Gleeble-3800热模拟机研究了多相抗变形X100高Nb含量管线钢的焊接性能,利用金相显微技术(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)对模拟焊接热影响区的组织进行了表征,结合示波冲击及微观硬度实验结果分析了影响模拟焊接热影响粗晶区(CGHAZ)的低温韧性及热影响区硬度与组织之间的关系.研究表明,高Nb抗变形X100管线钢单道次焊接热输入小于20kJ/cm时的CGHAZ具有较高韧性,形成大角晶界密度较高的板条贝氏体或针状铁素体；焊接热输入大于等于25kJ/cm会导致CGHAZ晶粒均匀性的恶化,使M/A组元粗化,并形成取向单一的粗大粒状贝氏体；示波冲击实验及SEM断口分析显示,粗大的M/A组元处极容易启裂,高的大角晶界密度可显著提高裂纹扩展功,使材料韧化.同时,为保证焊接热影响区不过度软化,以及高硬度产生抗氢致延迟破坏,单道次的焊接热输入以15-20kJ/cm为宜.
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