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在扫描电镜下，对焊接热影响区及一种焊缝金属的低周疲劳裂纹扩展进行了动态原位观察，进一步说明低周疲劳裂纹扩展的形态及方式，以及与材料的疲劳裂纹扩展阻力之间存在着一定的关系，其形态与方式是材料微观组织与特定循环载荷之间相互作用的某种反映．
Under the scanning electron microscope, the dynamic in-situ observation of the low-cycle fatigue crack growth in the weld heat-affected zone and a weld metal was carried out to further illustrate the morphology and mode of low-cycle fatigue crack growth and the fatigue crack growth resistance There is a certain relationship between the shape and mode of the material microstructure and a specific cycle of interaction between a certain reflection.