采用着色腐蚀技术，金相显示了球墨铸铁缩松区中奥氏体枝晶组织形貌，分析了球铁缩松的形成机制。
The morphology of austenite dendrites in shrinkage porosity in nodular iron is displayed by the color etching technique and the formation mechanism of shrinkage porosity has been analyzed.
钎焊焊缝的枝晶间显微疏松导致的应力集中与微裂纹效应以及近焊缝区母材晶粒长大是导管早期疲劳开裂的主要原因。
The results show that the crack initiates at the outer surface of the weld comer and propagates into the steel base material with a high cycle fatigue mode.
结果表明，激光处理后试样表面熔凝区的组织主要为胞状枝晶组织，经后续热处理可转变为细小的等轴晶粒组织，并形成了良好的超塑连接条件。
The results show that, after laser surface processing, a melt layer with cellular-dendrite structure is formed, which could transform into very fine-grained structure during the annealing treatment.
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