A notable discrepancy in tensile ductility was observed between two 2205 duplex stainless steels (DSS) containing layered and island-like austenite microstructures. The deformation behavior of both DSS 2205 was compared through in-situ Electron Backscatter Diffraction (EBSD) and Scanning Electron Microscope (SEM) techniques. The results indicated that the microscopic deformation mechanism for both DSS 2205 was governed by dislocation slip. The observed tensile ductility disparity was attributed to differences in dislocation slip behavior. In DSS 2205 with island austenite, slip transfer and blocking across grain boundaries occurred simultaneously, which was determined by the geometrical compatibility factor (m') calculations of adjacent ferrite and austenite grains. This intensified plastic inhomogeneities and promoted non-Schmid dislocation slip behavior. While in layered austenite of DSS 2205, the activation of slip system strictly adhered to the principle of maximizing the Schmid factor. Multiple slip systems in the ferrite on {110} and {112} planes were activated, inducing cross-slip, which enhanced ductility. The better ductility of DSS 2205 featuring layered austenite compared to the counterpart was further explained by quantitative analysis of geometrically necessary dislocations (GND) distribution in both phases and kernel average misorientation (KAM) values during deformation.

中文翻译：

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通过原位实验揭示两种层状和岛状奥氏体2205双相不锈钢塑性差异的机制

在两种含有层状和岛状奥氏体微观结构的 2205 双相不锈钢 (DSS) 之间观察到拉伸延展性存在显着差异。通过原位电子背散射衍射 (EBSD) 和扫描电子显微镜 (SEM) 技术比较了两种 DSS 2205 的变形行为。结果表明，两种 DSS 2205 的微观变形机制均受位错滑移控制。观察到的拉伸延展性差异归因于位错滑移行为的差异。在具有岛状奥氏体的 DSS 2205 中，滑移传递和跨晶界的阻塞同时发生，这是由相邻铁素体和奥氏体晶粒的几何相容系数 (m') 计算确定的。这加剧了塑性不均匀性并促进了非施密德位错滑移行为。而在DSS 2205层状奥氏体中，滑移系的激活严格遵循最大化Schmid因子的原则。铁素体中{110}和{112}平面上的多个滑移系统被激活，诱导交叉滑移，从而增强延展性。通过对变形过程中两个相中几何必要位错 (GND) 分布和形核平均取向误差 (KAM) 值的定量分析，进一步解释了具有层状奥氏体的 DSS 2205 比对应材料具有更好的延展性。