Abstract This study investigated the mechanisms of formation of the microstructure and texture of an Inconel 625 manufactured by additive manufacturing, using laser-based powder bed fusion. The resulting texture has a quadratic symmetry and a composite organization of grains. Some elongated grains have their 〈100〉 aligned along the build-up direction and grow from the middle of the melt pool, whereas the others are inclined with a lower texture. This is explained on the basis of usual solidification mechanisms. The overall texture is not very pronounced (texture index of 1.24) but sufficient to influence ultrasound wave propagation in a measurable manner. The difference is the most pronounced between the slow and fast quasi transverse waves. The contribution of two main factors influencing the anisotropy, namely the anisotropy of the single crystal and the shape of the grains, are discussed in the paper.

中文翻译：

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激光粉末床熔融制备镍基高温合金中超声波的晶体织构和速度

摘要 本研究研究了使用基于激光的粉末床融合通过增材制造制造的 Inconel 625 的微观结构和织构的形成机制。所得纹理具有二次对称性和晶粒的复合组织。一些细长晶粒的<100>沿堆积方向排列并从熔池中间生长，而其他的则倾斜并具有较低的织构。这是基于通常的凝固机制来解释的。整体纹理不是很明显（纹理指数为 1.24），但足以以可测量的方式影响超声波的传播。慢速准横波和快准横波之间的差异最为明显。影响各向异性的两个主要因素的贡献，