Grain size assessment using EBSD on heterogeneous additively manufactured microstructures

J del Gaudio, J Donoghue, P J Withers, A Garner, K Mingard, M Gee, A Gholinia
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Abstract

Grain microstructures are important for a whole range of materials properties. With the widespread use of additive manufacturing (AM), current standards for grain boundary evaluation, such as ASTM E2627-13, may not be fit for purpose due to their microstructural complexity. They are notoriously anisotropic across a range of length scales due to the non-equilibrium nature of the solidification process and the tracking of the heat source. In this work we examine the grain microstructure of a nickel superalloy produced by laser powder bed AM by electron back scatter diffraction. We find that the guidelines provided by the ASTM E2627-13 are not suitable for such heterogeneous and anisotropic materials and some modified guidelines are provided on the field of view and EBSD step size that should be used to characterise such materials.
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利用 EBSD 对异质添加制造微结构进行晶粒尺寸评估
晶粒微观结构对各种材料性能都很重要。随着增材制造(AM)的广泛应用,由于其微观结构的复杂性,目前的晶界评估标准(如 ASTM E2627-13)可能无法满足要求。由于凝固过程的非平衡性质和热源的跟踪,它们在一系列长度尺度上各向异性是众所周知的。在这项工作中,我们通过电子背散射衍射研究了激光粉末床调幅生产的镍超合金的晶粒微观结构。我们发现 ASTM E2627-13 提供的指导原则并不适合此类异质和各向异性材料,因此我们对表征此类材料时应使用的视场和 EBSD 步长提供了一些修改后的指导原则。
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