Nickel-aluminum bronze (NAB) is chosen for critical applications like marine propellers, pump components, and offshore structures due to its exceptional mechanical properties and corrosion resistance. Considering the utmost importance of the fatigue performance of NAB in such applications, this study investigates the fatigue performance of wire arc additive manufactured (WAAM) NAB in the annealed (675 °C for 6 h then furnace cooling) condition. To this end, static mechanical properties were evaluated using uniaxial tensile testing, while fatigue properties were assessed through fully reversed tests conducted at ambient temperature. Electron backscatter diffraction (EBSD) was utilized for the examination of the texture, and grain size distribution in annealed WAAM NAB. Additionally, scanning electron microscopy was employed to inspect fatigue-fractured specimens, while the analysis of EBSD was conducted to examine the deformation behavior beneath the crack initiation zone. The results provide insights into the fatigue life, crack initiation, and propagation characteristics of WAAM NAB relative to the cast counter material. The findings of this research provide valuable insights into the mechanical properties, microstructural characteristics, and fatigue response of WAAM NAB, informing the design of fatigue-resistant components and supporting the reliable utilization of WAAM NAB in demanding applications such as the marine and naval industries.

中文翻译：

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退火后条件下电弧增材制造的镍铝青铜 (NAB) 的疲劳响应


镍铝青铜 (NAB) 因其卓越的机械性能和耐腐蚀性而被选用于船用螺旋桨、泵组件和海上结构等关键应用。考虑到 NAB 的疲劳性能在此类应用中至关重要，本研究研究了电弧增材制造 (WAAM) NAB 在退火（675 °C 6 小时，然后炉冷）条件下的疲劳性能。为此，使用单轴拉伸测试评估静态机械性能，而通过在环境温度下进行的完全反向测试评估疲劳性能。电子背散射衍射 (EBSD) 用于检查退火 WAAM NAB 中的织构和晶粒尺寸分布。此外，还采用扫描电子显微镜检查疲劳断裂样本，同时进行 EBSD 分析以检查裂纹萌生区下方的变形行为。结果提供了有关 WAAM NAB 相对于铸造反材料的疲劳寿命、裂纹萌生和扩展特性的见解。这项研究的结果为 WAAM NAB 的机械性能、微观结构特征和疲劳响应提供了宝贵的见解，为抗疲劳部件的设计提供了信息，并支持 WAAM NAB 在船舶和造船工业等要求严苛的应用中的可靠使用。