[当前]。

J. K. Haneveld
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引用次数: 0

摘要

在含有替代溶质的钢中,铁素体的扩散控制生长理论在大过饱和状态下的转变中充满了困难,在这种情况下,铁素体和奥氏体的体成分相差不大,但在转变前沿仍然保持局部平衡。这就要求在界面处的奥氏体中存在一个取代溶质含量的小变化(所谓的“浓度峰”),这个小变化没有物理意义。根据spinodal反应的理论,这里证明了与这种成分急剧变化的产生有关的实质性惩罚。因此,峰值在实践中永远不会出现。溶质的实际分布距离将比目前计算的要大几个数量级,从而导致增长率比目前预测的要慢。这一结论的结果使人们怀疑从局部到准平衡的过渡,以及后一种状态是否存在于重建变换中。
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[Current].
The theory for the diffusion-controlled growth of ferrite in steels that also contain substitutional solutes is fraught with difficulties when it comes to transformation at large supersaturations, where the bulk compositions of the ferrite and austenite do not differ much, but where local-equilibrium is nevertheless maintained at the transformation front. This requires the existence of a narrow variation in substitutional solute content in the austenite at the interface (so-called ‘concentration spike’) so narrow that it has no physical meaning. Drawing on the theory for spinodal reactions, it is demonstrated here that there is a substantial penalty associated with the creation of such sharp changes in composition. Therefore, the spikes would never occur in practice. The actual distribution of solute would be over distances orders of magnitude larger than currently calculated, leading to slower growth rates than are predicted currently. The consequences of this conclusion place doubt both on the transition from local to paraequilibrium, and whether the latter state exists at all for reconstructive transformations.
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来源期刊
Tijdschrift Voor Diergeneeskunde
Tijdschrift Voor Diergeneeskunde 农林科学-兽医学
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审稿时长
12-24 weeks
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