抗粘扣不锈钢中滑移带相互作用和GND潜在硬化
Slip band interactions and GND latent hardening in a galling resistant stainless steel
摘要：
在晶粒长度尺度上，采用高分辨率数字图像相关和高角分辨率电子背散射衍射的小规模力学测试，对铁基耐磨损合金Nitronic 60的滑移激活、滑移带相互作用和GND密度进行了表征。通过将这两种测量技术相关联，提供了对滑移带相互作用、晶格曲率的产生和几何必要位错（GNDs）的相应积累的新见解。多个离散的滑移带通常在单个晶粒内活动，导致显著的滑移带相互作用。交叉滑移带被发现产生累积的GNDs。滑移带阻挡其他滑移带的区域与最高的GND密度相关，超过交叉滑移带密度的三倍。有代表性的晶体塑性建模研究表明，离散的滑移阻塞事件是负责局部升高GND密度。这种行为是合理的晶格曲率与交叉或阻塞型行为提供的不同程度的约束。铁素体晶粒也被发现有助于GND的产生。总之，这两种效应提供了重要的加工硬化机制，可能是未来铁基硬面合金发展的关键。
英文摘要：
Slip activation, slip band interactions, and GND densities in iron-base, galling resistant alloy Nitronic 60 have been characterised at the grain length scale using small-scale mechanical testing with high resolution digital image correlation and high-angular resolution electron backscatter diffraction. By correlating the two measurement techniques, new insight into slip band interactions, the generation of lattice curvature and the corresponding accumulation of geometrically necessary dislocations (GNDs) is provided. Multiple discrete slip bands are typically active within single grains, resulting in significant slip band interactions. Crossing slip bands were found to generate accumulations of GNDs. Regions where slip bands block other slip bands were associated with the highest GND densities, in excess of three time the densities of crossing slip bands. Representative crystal plasticity modelling investigations have demonstrated that discrete slip blocking events are responsible for locally elevated GND density. This behaviour is rationalised in terms of lattice curvature associated with the differing levels of constraint provided by the crossing or blocking-type behaviours. Ferrite grains are also found to contribute to the generation of GNDs. Together, these two effects provide significant work hardening mechanisms, likely to be key to the development of future iron-base hard facing alloys.
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