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On the Formation of Micro-Shrinkage Porosities in Ductile Iron Cast Components

机译：球墨铸铁件微缩孔隙的形成

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A combination of direct austempering after solidification (DAAS) treatment and electron backscatter diffraction (EBSD) method was used to study the formation of micro-shrinkage porosities in ductile iron. Analyzing the aus-ferritic microstructure revealed that most of micro-shrinkage porosities are formed at the retained austenite grain boundaries. There was no obvious correlation between the ferrite grains or graphite nodules and micro-shrinkage porosities. Due to the absolute pressure change at the (purely) shrinkage porosities, the dendrite fragmentation rate during the DAAS process would be altered locally, which caused a relatively finer parent-austenite grain structure near such porosities.
机译：采用凝固后直接回火（DAAS）处理和电子背散射衍射（EBSD）方法相结合的方法研究了球墨铸铁中微缩孔隙的形成。对奥氏体铁素体组织进行分析后发现，大多数微缩孔隙是在残留奥氏体晶界处形成的。铁素体晶粒或石墨结节与微缩孔隙率之间无明显相关性。由于在（纯）收缩孔隙中的绝对压力变化，DAAS过程中的枝晶碎裂率会局部改变，从而在这样的孔隙附近形成相对较细的母奥氏体晶粒结构。

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