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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Influence of chemical composition and holding time on austenite (?) - ferrite (á) transformation in ductile iron occurring within the intercritical interval
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Influence of chemical composition and holding time on austenite (?) - ferrite (á) transformation in ductile iron occurring within the intercritical interval

机译：临界区间内球墨铸铁中化学成分和保持时间对奥氏体（α）->铁素体（á）相变的影响

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摘要

This work focuses on the influence exerted by the chemical composition on the characteristics of the ? - > á reaction occurring within the intercritical interval of the Fe-C-Si diagram, in order to produce a new "dual phase ADI" variant. Three ductile iron melts with different chemical compositions were used and several thermal cycles were performed. The results show a strong dependence between the alloy composition and the characteristics of the ? - > á reaction, affecting the amount as well as the morphology of the precipitated allotriomorphic ferrite. Low alloy content promotes ferritic nucleation around graphite nodules and fast growth. Moreover, when the alloy content increases, the ferrite nucleates preferentially at the grain boundaries of the recrystallized austenite, and grows very slowly forming a continuous net. This novel microstructure is expected to enhance the mechanical properties of ductile cast iron.
机译：这项工作着眼于化学成分对α-铁氧化合物特性的影响。 →>在Fe-C-Si图的临界区间内发生反应，以产生新的“双相ADI”变体。使用了三种化学成分不同的球墨铸铁熔体，并进行了几次热循环。结果表明，合金成分与合金的特性之间存在很强的依赖性。 ->á反应，影响沉淀的同素异形铁素体的数量和形态。合金含量低会促进石墨球周围的铁素体形核并快速生长。而且，当合金含量增加时，铁素体优先在再结晶奥氏体的晶界处成核，并且非常缓慢地生长，形成连续的网。这种新颖的微观结构有望增强球墨铸铁的机械性能。

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