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在扫描电镜下对铁素体-珠光体钢及焊接热影响区的低周疲劳裂纹扩展进行了动态原位观察，材料的微观组织对裂纹的扩展存在着明显的影响。提出疲劳裂纹扩展的形态及方式与材料的疲劳裂纹扩展阻力之间存在着一定的关系，值得进一步研究。
The dynamic in-situ observation of low-cycle fatigue crack propagation in ferrite-pearlite steel and HAZ under the scanning electron microscope (TEM) showed that the microstructure of the material has a significant effect on the crack growth. It is proposed that there is a certain relationship between the form and mode of fatigue crack growth and the fatigue crack growth resistance of the material, which deserves further study.