Abstract In this work we propose a top-down strategy in which an austenitic stainless steel (type AISI 316L) and a ferritic stainless steel (type AISI 430LNb) are mechanically alloyed by Severe Plastic Deformation (SPD) to elaborate an architectured duplex stainless steel. This proposed strategy serves two main objectives: i) enhancing the properties by microstructure refinement down to sub-micron scale, and ii) elaborating a model material for understanding the behavior of Duplex Stainless Steel (DSS) obtained by the conventional metallurgical methods. The Accumulative Drawing and re-Bundling (ADB) technique has been successfully implemented for these specific materials, allowing to obtain multi-scale micro-composites of 316L/430LNb steels. The limits of this process in terms of microstructure refinement, have been identified as due to the complete regression of the micro-scale austenitic phase during annealing.

中文翻译：

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结构化双相不锈钢微复合材料：精细化和微观结构表征

摘要 在这项工作中，我们提出了一种自上而下的策略，其中奥氏体不锈钢（AISI 316L 型）和铁素体不锈钢（AISI 430LNb 型）通过严重塑性变形 (SPD) 进行机械合金化，以制作结构化双相不锈钢。该提议的策略有两个主要目标：i）通过将微观结构细化到亚微米级来增强性能，以及 ii）精心设计一种模型材料，用于了解通过传统冶金方法获得的双相不锈钢 (DSS) 的行为。累积拉伸和重新捆扎 (ADB) 技术已成功应用于这些特定材料，可以获得 316L/430LNb 钢的多尺度微复合材料。该工艺在微观结构细化方面的局限性，