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首页> 外文期刊>Materials Science and Engineering >Dynamic fracture behavior of additively manufactured Scalmalloy®: Effects of build orientation, heat-treatment and loading-rate
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Dynamic fracture behavior of additively manufactured Scalmalloy®: Effects of build orientation, heat-treatment and loading-rate

机译：碱性制造的动态断裂行为：建立方向，热处理和装载率的影响

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摘要

Scalmalloy® specimens are fabricated using Laser Beam Powder Bed Fusion to investigate the role of build orientation, loading-rate, and heat-treatment on critical energy release rate and crack growth resistance behaviors. Four build orientations - horizontal, vertical, flat, and diagonal - are assessed under dynamic loading conditions. The experiments are carried out in a split-Hopkinson pressure bar apparatus on edge-notched three-point bend geometries. The specimens with the horizontal build are studied also under quasi-static loading conditions to gain some insight into strain-rate sensitivity. The horizontal and flat build specimens are heat-treated for dynamic tests to study the effect of heat-treatment on high strain-rate fracture performance. The in-plane surface displacements near the crack are directly measured using Digital Image Correlation and ultrahigh-speed photography to evaluate the fracture parameters in each of these cases. A hybrid experimental-numerical approach that combines DIC measurements with finite elements is employed to evaluate the fracture behavior. The differences in the critical energy release rates and post-initiation fracture behaviors of Scalmalloy® under different conditions are quantified. The diagonal and horizontal builds outperform the vertical and flat builds in terms of dynamic crack initiation and growth characteristics. The quasi-static crack initiation and growth of the horizontal build specimens show significant strain-rate sensitivity relative to the dynamic counterparts. The heat-treatment of specimens result in marginal improvement of the dynamic fracture performance but does not affect the crack growth resistance behavior. Based on microstructural analyses, the melt-pool boundary orientation relative to crack front extension direction correlates well with the measured dynamic crack initiation and growth performance metrics.
机译：Scalmalloy®标本是使用激光束粉覆盖融合来制造的，以研究构建方向，装载率和热处理对临界能量释放率和裂纹生长抵抗行为的作用。在动态负载条件下评估四个构建方向 - 水平，垂直，平面和对角线。实验在边缘缺口的三点弯曲几何形状上的分体式霍普金森压杆装置中进行。具有水平构建的标本也在准静态负载条件下进行研究，以获得应变速率灵敏度的一些洞察力。水平和平坦的构建标本被热处理用于动态测试，以研究热处理对高应变率断裂性能的影响。使用数字图像相关性和超高速度摄影直接测量裂缝附近的面内表面位移，以评估这些情况中的每一个中的裂缝参数。采用与有限元相结合DIC测量的混合实验 - 数值方法来评估裂缝行为。量化了临界能量释放速率和Scalmalloy®在不同条件下的临界能量释放速率和发起后断裂行为的差异。在动态裂纹启动和生长特性方面，对角线和水平构造优于垂直和平坦的构建。水平构建标本的准静态裂纹启动和生长相对于动态对应物显示出显着的应变速率灵敏度。样品的热处理导致动态断裂性能的边际改善，但不影响裂纹生长抗性行为。基于微观结构分析，相对于裂纹前延伸方向的熔融池边界取向与测量的动态裂纹启动和生长性能度量相关。

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