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.
并藉著板厚的改变探讨其对热影响区之金相组织与硬度造成之影响。
Next, consider the effect of the thickness of plates on the microstructure and hardness in HAZ.
通过实验和变形区流线变化、金相组织和显微硬度的变化，对精冲成形的过程、特点、精冲成形机理进行了研究。
On the basis of experiment and change of metal flow line, metallographic structure and micro-hardness in deformation zone, this paper researched process, characteristic and mechanism of fine-blanking.
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