One of the primary barriers for adoption of additive manufacturing (AM) has been the uncertainty in the performance of AM parts due to residual stresses/strains. The rapid heating and cooling rates from the thermal history of the laser melting process result in high residual stresses/strains that produce significant part distortion. Efforts to mitigate residual stresses using post-process heat treatments can significantly impact the microstructures of the AM part which may lead to further issues. Therefore, the ability to accurately predict the residual stresses in as-built AM parts is crucial, and rigorous benchmark measurements are needed to validate such predictions. To fill this need, the AM-Bench aims to provide high-fidelity residual stress and strain benchmark measurements in well-characterized AM bridge-shaped parts. The measurements reported here are part of the residual elastic strain benchmark challenge CHAL-AMB2018-01-RS. Residual strains and stresses in this work were measured using neutron diffraction, synchrotron X-ray diffraction, and the contour method. Part deflection measurements were performed using a coordinate measurement machine after the part was partially separated from the build plate. These independently measured results show a high degree of agreement between the different techniques.

中文翻译：

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使用中子衍射，同步加速器X射线衍射和轮廓法对IN625 AM基准工件进行3D增材制造的弹性残余应变和应力测量以及相应的零件变形

采用增材制造（AM）的主要障碍之一是由于残余应力/应变导致AM零件性能的不确定性。由于激光熔化过程的热历史而产生的快速加热和冷却速率会导致较高的残余应力/应变，从而产生明显的零件变形。使用后处理热处理来减轻残余应力的努力会显着影响AM零件的微观结构，这可能会导致进一步的问题。因此，准确预测所制造的AM零件中残余应力的能力至关重要，因此需要严格的基准测试来验证此类预测。为了满足这一需求，AM-Bench旨在在特征明确的AM桥形零件中提供高保真残余应力和应变基准测试。此处报告的测量结果是残余弹性应变基准测试CHAL-AMB2018-01-RS的一部分。使用中子衍射，同步加速器X射线衍射和轮廓法测量了这项工作中的残余应变和应力。在零件与构建板部分分离之后，使用坐标测量机执行零件变形测量。这些独立测量的结果显示了不同技术之间的高度一致性。在零件与构建板部分分离之后，使用坐标测量机执行零件变形测量。这些独立测量的结果显示了不同技术之间的高度一致性。在零件与构建板部分分离之后，使用坐标测量机执行零件变形测量。这些独立测量的结果显示了不同技术之间的高度一致性。