Abstract The present work was conducted to establish an initial understanding of the processing-microstructure-property relations for γ-TiAl manufactured by electron beam powder bed fusion. The investigation included microstructure characterization at different length scales of near-γ titanium aluminide Ti-48Al-2Cr-2Nb (in atom pct) in addition to evaluating the compressive strength, microstructures, fracture toughness, and fatigue crack growth behavior. Micro-CT revealed significant variations in the spatial distribution of internal defects along the build of the as-deposited sample, while HIP reduced these defects. However, inhomogeneous microstructures were exhibited in both the as-deposited and HIP materials while HIP processing reduced both the yield strength and amount of scatter in mechanical properties. Despite these observations, fracture toughness and fatigue crack growth results were in the range of those reported for conventionally cast material. The use of cloud computing provided an efficient means for data management, microstructure analytics, and collaboration among various contributors to the work.

中文翻译：

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HIP对增材制造EBM Ti-48Al-2Cr-2Nb显微组织异质性、缺陷分布和力学性能的影响

摘要 本工作旨在初步了解电子束粉末床熔融制造γ-TiAl 的加工-显微组织-性能关系。除了评估抗压强度、微观结构、断裂韧性和疲劳裂纹扩展行为之外，调查还包括近γ铝化钛Ti-48Al-2Cr-2Nb（原子%）在不同长度尺度上的微观结构表征。Micro-CT 显示内部缺陷的空间分布随着沉积样品的构造发生显着变化，而 HIP 减少了这些缺陷。然而，在沉积态和 HIP 材料中都表现出不均匀的微观结构，而 HIP 加工降低了屈服强度和机械性能的分散量。尽管有这些观察，断裂韧性和疲劳裂纹扩展结果在报告的常规铸造材料的范围内。云计算的使用为数据管理、微观结构分析以及不同工作贡献者之间的协作提供了一种有效的手段。