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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。
The microscopic mechanical behavior of inclusions with different sizes and shapes in X80 pipeline steel caused by initiation and propagation of cracks under tensile load was observed and observed by scanning electron microscope in situ observation. The results show that under the tensile load, the larger the area of inclusions, the more the number of crack initiation inclusions in the inclusions, the smaller the stress at the initiation of the first crack initiation. The shape and area of the inclusions determine the initiation of the first crack Position. When the inclusions were irregular in shape and the edges and corners were large, the crack spreads to the matrix in the initial stage of initiation, but then the crack will not continue to expand in the matrix after further loading. The inclusion has no significant effect on the tensile properties of X80 pipeline steel influences.