采用扫描电镜原位观测的方法,跟踪观察了拉伸载荷作用下X80管线钢中不同尺寸、形态的夹杂物导致裂纹萌生与扩展的微观力学行为。结果表明：在拉伸载荷作用下,夹杂物面积越大,夹杂内萌生的裂纹条数越多,第1条裂纹萌生时的应力越小;夹杂物的形态和面积决定第1条裂纹的萌生位置;当夹杂物呈不规则形态且棱角较多时,裂纹在萌生初始阶段就向基体扩展,但之后继续加载时裂纹不会继续在基体中扩展;夹杂物对X80管线钢的拉伸性能无显著影响。
TONG Ke, WEI Zun-yi, ZHU Li-xia, HE Xiao-dong , ZENG Yan-ping（Abstract： The micro-mechanical behavior of inclusion in X80 pipeline steel under tensile loading was investigated by means of SEM in-situ observation. The influence of shape and size of inclusion on crack initiation and propagation was analyzed. The results show that the larger the size of an inclusion is, the more the number of cracks initiated in the inclusion is, and the lower the initiation stress of the first crack is; the shape and size of inclusion determine the location of the first crack; for the inclusion with irregular shape and many shape corners, firstly cracks generate in inclusion and initiate in the matrix, then no longer propagation; inclusion has little influence on tensile performance of X80 pipeline steel.
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