在透射电镜中进行动态拉伸原位观察珠光体裂纹萌生与扩展的微观过程.结果表明:珠光体裂纹萌生与扩展方式取决于珠光体层片和拉伸轴的位向关系.当珠光体层片平行于拉伸轴时,裂纹在渗碳体和铁素体中交替萌生,垂直于层片扩展;当珠光体层片垂直于拉伸轴时,裂纹在铁素体中萌生,平行于层片扩展;当珠光体层片与拉伸轴斜交时,裂纹通过渗碳体和铁素体交替断裂而扩展;裂纹也可以在珠光体团边界萌生和扩展.
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