增材制造Inconel 718离心盘光整加工的深度分辨表征
Depth-Resolved Characterization of Centrifugal Disk Finishing of Additively Manufactured Inconel 718
AI总结：
本研究针对增材制造Inconel 718的离心盘光整加工，采用白光轮廓仪和高能X射线衍射表征其深度相关的表面与亚表面特性，发现该工艺可消除表面织构且在表层100μm内引入显著残余微应变。
摘要：
表面特性是增材制造（AM）零部件服役性能尤其是疲劳寿命的主要影响因素。离心盘光整加工（CDF）是众多用于对AM零部件的表面和边缘进行光整处理的刚性介质磨料加工工艺之一。在当前应用于AM的各类磨料加工工艺中，CDF的材料去除率和所施加的惯性力处于中等水平。目前尚不清楚CDF如何改变加工表面的下层微观结构。本研究采用白光轮廓仪和高能X射线衍射技术，对经激光粉末床熔融制备、CDF光整加工的Inconel 718试样，表征其表面光洁度、晶体学织构以及残余微尺度应变的各向异性分布随深度的变化规律。实验分别采用单峰和双峰分布的光整介质粒径进行表面加工。研究发现，CDF能够消除AM零部件的表面晶体学织构（本研究中为{111}纤维织构），但通常不会改变基体织构（本研究中为立方织构）。研究还发现，CDF会在距样品表面的前100μm范围内引入大量残余微尺度应变，证据为：距表面20μm处的衍射峰宽度较120μm处增加了约50%。
英文摘要：
Surface characteristics are a major contributor to the in-service performance, particularly fatigue life, of additively manufactured (AM) components. Centrifugal disk finishing (CDF) is one of many rigid media, abrasive machining processes employed to smooth the surfaces and edges of AM components. Within the general family of abrasive machining processes currently applied to AM, CDF is moderate in terms of material removal rate and the inertial forces exerted. How CDF alters the underlying microstructure of the processed surface is currently unknown. Here we employ white light profilometry and high-energy X-ray diffraction to characterize surface finish, crystallographic texture, and anisotropic distributions of residual microscale strain as a function of depth in CDF-finished Inconel 718 manufactured with laser powder bed fusion. Surfaces are finished using both unimodal and bimodal finishing media size distributions. We find that CDF will remove surface crystallographic textures (here a {111} fiber texture) from AM components, but generally not alter the bulk texture (here a cube texture). CDF is also found to impart significant amounts of residual microscale strain into the first 100 $μ$m from the sample surface as evidenced by an approximately 50% increase in diffraction peak widths at 20 $μ$m from the surface in comparison to 120 $μ$m.
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