Microstructure evolution during indentation of Inconel-718 created by additive manufacturing
Microstructure evolution during indentation of Inconel-718 created by additive manufacturing
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DOI：
10.1016/j.msea.2020.139204
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发表时间：
2020-04-20
期刊：
影响因子：
6.4
通讯作者：
Basu, Saurabh
中科院分区：
文献类型：
--
作者：
Rifat, Mustafa;DeMeter, Edward C.;Basu, Saurabh
增材制造 (AM) 部件的精加工对于为其提供足够的公差和疲劳寿命至关重要。这些工艺通常依赖于表面变形来去除粗糙特征并增强底层的微观结构。然而，精加工工艺的优化对于增材制造部件来说具有挑战性，因为它们的变形机制因接收表面中存在的微观结构/缺陷/粗糙度组合而变得复杂。在这项工作中，通过压痕研究了增材制造 IN718 的表面变形力学。描述了分级表面微观结构、表面纹理和孔隙缺陷对微观结构演化轨迹的影响。利用这些见解，创建了基于有限元的增材制造 IN718 表面变形数值框架。论证了该框架在分析各种微观结构/缺陷/粗糙度组合的表面变形中的实用性。讨论了这些见解对各种增材制造零件的精加工工艺优化的影响。
Finishing of components originating from additive manufacturing (AM) is critically important for providing them with adequate tolerances and fatigue life. These processes often rely on surface deformation for removal of roughness features and enhancing the underlying microstructures. Optimization of finishing processes is however challenging for AM components as their mechanics of deformation is complicated by microstructure/defect/roughness combinations present in as-received surfaces. In this work, the mechanics of surface deformation in additively manufactured IN718 is studied via indentation. Effects of graded surface microstructure, surface texture and porosity defects on microstructure evolution trajectories are delineated. Using these insights, a finite element based numerical framework of surface deformation of additively manufactured IN718 is created. Utility of this framework in analysis of surface deformation of various microstructure/defect/roughness combinations is demonstrated. Implications of these insights in the optimization of finishing processes of various additively created parts is discussed.