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Copper and its effects on microstructure and correlated tensile properties of super duplex stainless steels

机译：铜及其对超双工不锈钢微观结构和相关拉伸性能的影响

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摘要

In the last few years, Cu is handled as a promising element to improve the corrosion resistance of duplex steels. Although there is a very limited number of studies in the literature describing the influence of Cu on the microstructure of duplex steels in the aged condition, to the authors' knowledge, no comprehensive study has been presented so far that describes in detail its influence on the microstructure and correlated mechanical properties in the solution-annealed condition. Consequently, this work is intended to fill that gap to provide a fundamental base for material design of novel duplex steels. Microstructural investigations showed a preferred formation of austenite combined with an elemental redistribution of Cr and Mo. Especially at the highest Cu content investigations revealed precipitation of Cu particles causing - so far unknown - an intragranular austenite in ferrite. It is proposed that the enrichment of austenite forming elements, i.e. Ni, at their phase boundaries as well as a low misfit between Cu particles and the intragranular austenite nuclei play a significant role during its nucleation. Due to the identified microstructural changes triggered by Cu an increased imbalance of the flow stress between ferrite and austenite, and thus a decrease of the macroscopic yield strength can be proposed. In turn an increased work hardening with Cu addition causes an unaffected ultimate tensile strength.
机译：在过去几年中，Cu被处理为有希望的元素，以提高双工钢的耐腐蚀性。虽然在文献中有一个非常有限数量的研究，但是描述了Cu对老年条件的双工钢的微观结构的影响，迄今为止没有综合研究，以详细描述其对其的影响溶液退火条件下的微观结构和相关机械性能。因此，这项工作旨在填补该差距，为新型双工钢的材料设计提供基础。微观结构研究表明，奥氏体的优选形成与Cr和Mo的元素再分布结合。特别是在最高的Cu含量调查中，揭示了Cu颗粒的沉淀导致 - 到目前为止，奥氏体颗粒 - 铁素体中的鞘内奥氏体。提出，富含奥氏体形成元素，即Cu颗粒和鞘内奥氏体核在其相界中的芳酸酯形成元素，即Ni在其相界和腔内奥氏体核之间发挥着重要作用。由于Cu触发的鉴定的微观结构变化，即铁氧体和奥氏体之间的流量应力的增加，因此可以提出宏观屈服强度的降低。反过来，随着Cu的增加，加入的加工使得不受影响的最终拉伸强度。

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