采用裂纹尖端张开位移(CTOD)实验对X100高强管线钢焊接接头母材、焊缝和热影响区(HAZ)进行了断裂韧性测试研究,并使用SEM和TEM对CTOD试样近断口区组织及夹杂物进行了观察.结果表明,温度对X100高强管线钢焊接接头断裂韧性有显著影响.在同一温度下,条件启裂值δ0.2和δ0.2BL均呈现母材最大、热影响区次之、焊缝最小,即母材低温断裂韧性最优、热影响区次之、焊缝最差,但随温度降低,其断裂韧性均下降.母材试样近断口区显微组织为粒状贝氏体(GB)和少量准多边形铁素体(QF)及板条贝氏体铁素体(BF),细小粒状M-A组元弥散分布于贝氏体铁素体板条界处；焊缝试样近断口区组织为针状铁素体(AF),M-A组元形态多样,尖角明显；热影响区粗晶区近断口组织为粒状贝氏体和平行排列的板条状贝氏体铁素体,M-A组元呈方形、楔形、条形分布于晶内、晶界和板条界处.大尺寸尖角型M-A组元是导致焊缝和热影响区粗晶区断裂韧性差的主要原因之一,而较高的夹杂物分布则使焊缝具有较低的断裂韧性.
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